Quantcast
Channel: RAM | STAAD | ADINA Wiki
Viewing all 8748 articles
Browse latest View live

RAM Connection

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/10/2017 3:34:26 PM

Everything Needed for Steel Connection Design

RAM Connection can check or design connections in seconds. Whether you design connections or need to check connections designed by the shop, RAM Connection is the software for you. In just one low-cost package, you get both AISC ASD and LRFD as well as BS5950-1 connection design and optimization for shear and moment connections, braced frame connections, and column and beam splices. Through its seamless integration with the [[RAM Structural System]], [[RAM Elements]], and [[STAAD.Pro]], RAM Connection raises the bar to a new level of productivity. All data regarding member sizes, joint geometry, and forces are transferred directly from either the RAM Structural System, RAM Elements, or STAAD.Pro to RAM Connection.

Visit the RAM Connection product Page for additional information on this product.

Bentley CONNECT RAM Connection is CONNECTED. Why CONNECT?

ISM Enabled RAM Connection is ISM Enabled.

[[RAM Connection Key Features]]

LEARN

View RAM Connection learning paths on Bentley's LEARNserver.

Download

You can download the latest version of RAM Connection from Bentley's Fulfillment Center.

RAM Connection is available under a Structural Enterprise License. Learn more.

Support

Visit [[RAM Connection Support Solutions]]

Related

[[RAM Elements]], [[RAM Structural System]], [[STAAD.Pro]], [[Limcon]]

Tags: BS5950, RAM Elements, STAAD.Pro, Steel Design, RAM Connection, AISC, RAM Steel

RAM Structural System

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/10/2017 3:35:39 PM

Structural Design Software for Buildings

The RAM Structural System is powerful and versatile special purpose software for the analysis and design of building structures. It is useful in the design and analysis of commercial, institutional and industrial buildings. The RAM Structural System is composed of the following: RAM Manager, RAM Modeler, RAM Steel (steel gravity design), RAM Frame (lateral analysis), RAM Concrete (concrete design) and RAM Foundation (spread, pile and continuous foundation design).

Learn more by visiting the following product pages on Bentley.com:

Bentley CONNECT RAM Structural System is CONNECTED. Why CONNECT?

ISM Enabled RAM Structural System is ISM Enabled.

LEARN

View RAM Structural System learning paths on Bentley's LEARNserver.

[[RAM Structural System Videos]]

Download

You can download the latest version of RAM Structural System from Bentley's Fulfillment Center.

RAM Structural System is available under a Structural Enterprise License. Learn more.

Support

Visit [[RAM Structural System Support Solutions]]

Related

[[RAM Concept]], [[RAM Elements]], [[RAM Connection]], RAM Structural System Revit Link, RAM SBeam

Tags: Building Codes, ACI, Structual Engineering, Beam Design, Steel Design, Foundation Design, RAM, Lateral Analysis, Revit, Concrete Design, AISC, product description, Column Design, Shear Wall

STAAD Foundation Advanced

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/10/2017 3:37:53 PM

STAAD Foundation Advanced: Foundations done right

Comprehensive Foundation Design Software

STAAD Foundation Advanced is used for the analysis and design of isolated footings, combined footings, strip footings, pile caps and mat foundations. It can be used as a standalone product or integrated with [[STAAD.Pro]].

Vist the STAAD Foundation Advanced Product Page for additional information on this product.

Bentley CONNECT STAAD Foundation Advanced is CONNECTED. Why CONNECT?

ISM Enabled STAAD Foundation Advanced is ISM Enabled.

LEARN

View STAAD Foundation Advanced learning paths on Bentley's LEARNserver.

[[STAAD Foundation Advanced Videos]]

Download

You can download the latest version of STAAD Foundation Advanced from Bentley's Fulfillment Center.

STAAD Foundation Advanced is available under a Structural Enterprise License. Learn more.

Support

Visit [[STAAD.Foundation Advanced Support Solutions]]

Tags: STAAD Foundation Advanced, structural engineering, STAAD.Pro, foundation, STAAD

Microstran

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/10/2017 3:49:04 PM

General purpose structural analysis and design

Microstran is a powerful general purpose structural analysis package with built-in steel member and connection design. Microstran features nonlinear and buckling analysis, integrated steel connection design, and export to a number of other engineering formats.

Visit the Microstran product page for additional information on this product.

ISM Enabled Microstran is ISM Enabled.

  • [[Microstran Images]]
  • [[Microstran Awards and Certifications]]

Learn

View Microstran learning paths on Bentley's LEARNserver.

Video

(Please visit the site to view this video)

Download

You can download the latest version of Microstran from Bentley's Fulfillment Center.

Microstran is available under a Structural Enterprise License. Learn more.

Support

Visit [[Microstran Support Solutions]]

Key Features

  • Master-Slave Constraints
  • Elastic Critical Load Analysis
  • Response Spectrum Analysis
  • Caternary Cable Element
  • Dynamic Analysis
  • Gap & Fuse Members
  • Moving Load Generator
  • Steel Design
  • Steel Connection Design
  • Geodesic Domes
  • Rigid offsets
  • Export to CAD format

Related

[[STAAD.Pro]], [[STAAD(X)]], [[RAM Elements]]

Tags: structural design, Microstran, Structural Analysis

What's New in ISM 6.0?

$
0
0
Current Revision posted to RAM | STAAD Wiki by Jesse Dringoli on 7/10/2017 4:18:53 PM

Version and Download Information

Release Date: January 24, 2017

Versions:

Download Instructions:

Structural Synchronizer can be downloaded from Bentley’s i-ware site here.

Structural Synchronizer can also be downloaded from Bentley Cloud Services. After signing into the CONNECTION Center, select Software Downloads under My Support. Once on the Software Fulfillment page, the Structural Synchronizer installer can be located by performing a search on “Structural Synchronizer”. 

Special Notices:

Installing Structural Synchronizer installs both the Structural Synchronizer application itself, used in interoperability workflows, and the ISM framework, used for programming. Once Structural Synchronizer is installed, the ISM options within all ISM-enabled applications will be available for use, as shown below.

This version of Structural Synchronizer publishes i-models to a newer format, DgnDb 0601, that cannot be read by Structural Navigator CONNECT Edition. Users must update to Structural Navigator CONNECT Edition Update 1 to open i-models published with this version of Structural Synchronizer.

RAM Elements users who utilize ISM should avoid upgrading to ISM 6.0, as RAM Elements is compatible only with ISM 5.0 or earlier. An update to RAM Elements that is compatible with ISM 6.0 is currently in development.

ProStructures users who utilize ISM should avoid upgrading to ISM 6.0, as RAM Elements is compatible only with ISM 5.0 or earlier. An update to RAM Elements that is compatible with ISM 6.0 is currently in development.

New Features

The following enhancements were added in ISM 6.0 and Structural Synchronizer CONNECT Edition Update 1.

Piping Systems

This release incorporates piping systems into the ISM framework. Piping, bends, flanges, valves, pipe supports, pipelines, and piping reactions can now be written to and read from an ISM model with the ISM 6.0 API. Likewise, Structural Synchronizer now supports visualization and revision management for piping. The ability to now combine piping systems with structural elements in one ISM repository provides a robust framework for plant design workflows.

The ISM SDK documentation has been updated with piping interfaces new in 6.0. Coding samples are also now available that demonstrate how to build a structure using the ISM API. For more information on the ISM SDK, please contact Josh Taylor at Josh.Taylor@bentley.com.

New Sample Models

New sample repositories are delivered with the installation of Structural Synchronizer. These sample repositories are located in the following folder:

\Documents\ISM\Samples

The repository AutoPIPE Tutorial 1.ism.dgn was published from AutoPIPE using the tech preview interoperability with ISM. Basic Flat Slab (US).ism.dgn was published from RAM Concept. The repositories Building - Steel Over Concrete (Euro).ism.dgn and Concrete Moment Frame (ACI-318).ism.dgn were published from RAM Structural System. The beam, column, and wall reinforcing were designed in RAM Concrete.

Error Corrections

This release of ISM contains the following error corrections.

Transparency for Surface Member Modifiers Not Set Correctly

ISM published Surface Member Modifiers in such a way such that smart transparency did not work once the ISM repository was published to i-model and opened in Structural Navigator. As a result, regions of a slab that used Surface Member Modifiers, such as drop panels or thickened slabs, were not able to be viewed transparently in Structural Navigator and any reinforcing within these regions of the slab was not visible.

IFC Export Log File

When saving the log file in an ISM repository conversion to IFC using Structural Synchronizer, the user was given no control over where to store the log file. The last log file was simply overwritten.

See Also

Bentley CONNECT Overview

[[Integrated Structural Modeling Home]]

 

Tags: ProStructures, SACS, ISM 6.0, RAM, Interoperability, structural synchronizer, STAAD

Ram Elements - Configuration settings

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/10/2017 4:21:28 PM
  
 Applies To 
  
 Product(s):RAM Elements
 Version(s):13.0 or later
 Environment: N/A
 Area: Installation
 Original Author:Bentley Technical Support Group
  

Where are the custom configuration settings for Ram Elements and the various modules saved? 

Throughout Ram Elements there are numerous locations where the user can customize various settings. These are typically noted with a check box indicating "Current values as default" like the one at the bottom of the Analysis dialog box:

 

Those settings and others like print settings, recent file lists and more are saved in various config files typically located in a path like this (Windows 7):

C:\Users\User.Name\AppData\Roaming\Bentley\Engineering\RAM Elements.en\

Where the User.Name is the current user login name.

If you want to restore the program presets you can delete files within this folder (or the whole folder) and then restart Ram Elements. This might be necessary if the current settings are somehow corrupted and causing the program to malfunction (a module might not launch at all, or the window might be stretched to the point where it's unusable, for example).

The following batch file has been created to automate the removal process.

See Also

RAM Elements - View Control FAQ

Tags: RAM Elements, Configuration

RAM SS V15.05 Release Notes

$
0
0
Revision 1 posted to RAM | STAAD Wiki by Allen Adams on 7/10/2017 10:51:05 PM

RAM Structural System CONNECT Edition Update 5 Release 15.05

Release Notes

 

Release Date: July 2017

 

This document contains important information regarding changes to the RAM Structural System. It is important that all users are aware of these changes. Please distribute these Release Notes and make them available to all users of the RAM Structural System.

 

Bentley CONNECT:

Bentley CONNECT offers several benefits, and the value continues to increase with each new release. Listed here are two key features.

 

CONNECTION Center

When you sign in to your Bentley account you now have easy access to CONNECTION Center. This personalized portal gives you easy access to Usage reports, site configuration information, downloads, and Learning information on webinars, seminars and events, and includes a transcript listing the Bentley courses that you have completed. Your personal portal also lists your recent projects with a portal into analytics on that project. CONNECTION Center can be accessed by selecting the Sign In command in the upper right corner of the RAM Manager screen.

 

If you do not already have a Bentley ID, go to http://www.bentley.com/profile and select the Sign Up Now link.

 

CONNECTED Projects

All of Bentley’s CONNECT Edition programs, including RAM Structural System, allow models to be associated with a project. Multiple models, from any of the Bentley products, can be associated with a given project. This simplifies the process of keeping track of work done for a project, and will enable analytics to be performed and reported for the project.

 

A ProjectWise Projects portal enables you and your project teams to see project details required to evaluate team activity and understand project performance.

  • View project activity by site, application and user
  • Gain insights into the users who are working on your projects and their effort
  • Register and manage your CONNECTED Projects
  • Access ProjectWise Connection Services including ProjectWise Project Sharing, ProjectWise Project Performance Dashboards and ProjectWise Issue Resolution AdministrationWhen a model is Saved in this version the program will ask for a Project to which the file is to be associated. Projects can be registered (created) from your Personal Portal, or from the Assign Project dialog by selecting the + Register Project command.Tutorial:  This version automatically converts databases created in previous versions to the new database format. Note that a backup file is created automatically when a database is converted; the name of the database is the same, with “Orig” and the version number appended to the name. The file has an extension of “.zip” and is located in the same directory as the original database.The previous steel tables and load combination templates supplied with the program will be replaced with new tables and templates of the same name. If you have customized any Master or Design tables or load combination templates supplied with the program without changing the file names, those file names should be renamed from the original RAM table names prior to installation to prevent your changes from being lost.Installation Instructions: Appendix C at the end of these Notes contains a document describing features available in the RAM Structural System to help prevent inadvertent use of unlicensed modules. Refer to that document for more information.New Features and Enhancements: Each module has a button in the tool bar to invoke the CONNECT Advisor. The CONNECT Advisor provides links to pertinent Bentley courses, YouTube videos, Bentley Communities wikis and articles, and manuals. This provides timely information to help you better learn the capabilities of the program.
  •  
  • CONNECT Advisor
  • For details on these new features and enhancements, refer to the manual .pdf files available from the Help menu in each module or from the Manuals folder on your hard drive.
  •  
  • Product Licensing FAQ:
  • This version can be found on the Bentley Software Fulfilment web page by logging into the Personal Portal or the Enterprise Portal and selecting the Software Downloads icon. Perform a search for “RAM Structural System”, select any of the RAM Structural System modules (e.g., RAM Modeler; they all use the same installer), and select the latest version of the RAM Structural System.
  •  
  •  
  • Important Notices:
  • The Tutorial Manual has not been updated but is still valid. The appearance of some parts of the program in this version may differ from that shown in the Tutorial.
  •  
  •  

ACI 318-14

The requirements of ACI 318-14 have been implemented in the RAM Concrete module.

Note: For frame walls were special boundary elements are required, Section 18.10.6.4(b) requires a boundary zone width of hu/16, where hu is the height between braced levels. Typically this is the panel height (story height), but it is possible that walls may span through multiple levels without being braced at those levels. In the current implementation, the program uses the panel height for this check, which is unconservative if the wall spans multiple levels. This will be addressed more comprehensively in a future version.

 

IBC 2015

Load combination templates for steel, concrete, and foundation design based on the IBC 2015 requirements have been added.

 

 

 

Construction Stage Analysis

The ability to analyze the structure by construction stages has been implemented. The stage sequence can be assigned by story or by individual members, and the structure analyzed by stages for dead load. These results can then be used instead of the traditional dead load analysis. This type of analysis is especially appropriate for taller concrete structures; it acknowledges that the dead loads are applied to the structure as it is built, not suddenly after it is built. In RAM Frame, the Criteria – Construction Stage Analysis command is used to specify stages, by story. That command is also used to specify that these results are to be used in place of the traditional Dead Load analysis. The Assign – Stage Number command can be used to assign stage numbers to individual members, if different than the Stage Number otherwise assigned to the members on that story. Care should be taken when using this command not to create an unstable condition for a given stage. The Construction Stage Analysis load case can be created using the Loads – Load Cases command. Construction Stage Numbers can be displayed using the Construction Stage option in the View – Members command (or using the Construction Stage Numbers button on the tool bar). Members can be displayed stage-by-stage using the Show Stages button on the tool bar.

 

Diaphragm Section Forces

For semirigid diaphragms the forces across any section cut line can be reported. This is useful for obtaining the diaphragm forces used in the design of the diaphragm. This is done using the Reports – Diaphragm Forces command, selecting a Plan view, and clicking and dragging the cutline at any location on a semirigid diaphragm. Note that in order for these results to be available it is necessary to select the “Store diaphragm forces” option in the Criteria – General command.

 

Diaphragm Stiffness Modifiers

In addition to the ability to specify cracked section properties for concrete semirigid diaphragms that was previously available, the user can now optionally specify diaphragm stiffness modifiers for all semirigid diaphragms. The modifiers can be specified for each of the six degrees of freedom of the diaphragm elements. This is done in the Modeler using the PropTable – Decking command.

 

India Standards

Several India standards have been implemented for analysis and design

  • National Building Code of India 2005: Live Load Reduction
  • IS 875 (Part 3): 1987 (Reaffirmed 2003): Wind Loads
  • IS 1893 (Part 1): 2002 and IS 1893 (Part 1): 20016: Seismic Loads and Response Spectra Analysis
  • IS 800: 2007: Notional Loads
  • IS 800: 2007: Steel DesignGlobal Axis Display The buckling resistance moment capacity, Md,Rd, for I-Sections previously relied on the provisions of BS EN 1993-1-1:2005 Section 6.3.2.2. The provisions of Section 6.3.2.3 are now used in determining Mb,Rd for wide-flanged sections. The capacities for all other shapes are still evaluated per the requirements of Section 6.3.2.2.Castellated and Cellular Beams Mat foundations can now be export to ISM.
  •  
  • ISM
  • Previously in the program, castellated and cellular beams were referred to as SMARTBEAMs. They are no longer marketed or produced under that name. These beams are now called C-BeamsTM and are produced by SteelFab, Inc. The design is unchanged.
  •  
  • Eurocode Buckling Resistance Moment Capacity for I-Sections
  • There is now an option to display an indicator of the global axis, located at the origin of the model.
  •  

Technology Preview

This version contains two powerful features that have been designated Technology Preview features. They are features that are in a state that would previously been referred to as a Beta version. These two features are Analytical Insights and SQLite database of result. It is likely that these features will continue to undergo revisions based on feedback from users. Care should be taken if these are used for actual design, because they are still in the process of being revised; they have not gone through the rigorous testing process. They are being made available so that you can use them with real models in real design situations, and provide us with feedback and suggestions for making these features more useable and productive.

 

Analytical Insights – Technology Preview

The Analytical Insights feature analyzes your model and compares them with a set of Structural Performance Indicators (SPI). These SPI’s can be configured to conform to your office standards and practices, and prioritized according to their importance. Your model is then scored based on these SPI’s helping you identify possible changes to the model to make it more economical or constructable. See Appendix A at the end of this document for more information.

 

SQLite Database of Analysis and Design Results – Technology Preview

In order to more easily access the geometry and analysis data, this data is now written out to SQLite files. A report generator is provided that can be used to create a .xlsx file that can then be used in spreadsheets in Excel. The file can be customized to contain the information that you want made available. See Appendix B at the end of this document for more information.

 

 

Error Corrections:

                                                                                     

Some program errors have been corrected for Version 15.05. Corrections made to graphics, reports, Modeler functions, program crashes, etc that were considered minor are not listed here. The noteworthy error corrections are listed here in order to notify you that they have been corrected or to assist you in determining the impact of those errors on previous designs. These errors were generally obscure and uncommon, affecting only a very small percentage of models, or had no impact on the results. The errors, when they occurred, were generally quite obvious. However, if there is any question, it may be advisable to reanalyze previous models to determine the impact, if any. In each case the error only occurred for the precise conditions indicated. Those errors that may have resulted in un-conservative designs are shown with an asterisk. We apologize for any inconvenience this may cause.

 

DXF Output

DXF FILES IN MICROSTATION CE: DXF files created in RAM Structural System could not be opened in MicroStation CE due to unrecognized spaces before numbers.

Effect: MicroStation could not open DXF files created in RAM Structural System.

 

RECTANGULAR STEEL TUBE ORIENTATION: The orientation of rectangular steel tubes was off by 90 degrees in the floor framing plan DXF.

Effect: Rectangular tubes were drawn rotated 90 degrees from their true orientation.

 

Modeler

RIGID LINKS: If rigid links were modeled to create offset beams, and the grid associated with one end of the beam was moved, and the layout type was moved on more than one level, the rigid links were not updated to their new location at all of the levels where the floor type was used.

Effect: In a rare set of conditions as explained, rigid links were not updated at some levels if the grid associated with them was moved.

 

Gravity Loads

LOADS ON SLOPED GRAVITY WALLS*: When Gravity walls are supported by Frame walls, the program tracks the loads of the gravity walls and transfers them down to those Frame walls below. However, if the top of the Gravity walls were sloped, Line and Point loads on such gravity walls were mishandled while transferring them to Frame walls below.

Effect: Line and Point loads modeled on sloping Gravity walls supported by Frame walls below were lost, and not applied to the Frame walls. The error did not occur if the Gravity walls were not sloping.

 

RAM Steel Beam

COMPACT CHANNELS AISC 360: Some compact channel sizes designed according to AISC 360 were flagged as slender and skipped during optimization.

Effect: During optimization some compact channels were erroneously tagged as slender and skipped. Some frozen compact channels were flagged as slender and not designed. Previously these channels were designed correctly.

 

VIEW/UPDATE DEFLECTION INTERACTION: The deflection interaction value displayed in the View/Update dialog box was incorrect for beams that were modeled as composite beams but had to be designed non-compositely because the required number of studs wouldn’t fit.

Effect: While designs and reports for composite beams designed non-compositely were correct, the value displayed for the deflection interaction in the View Update dialog box was incorrect.

 

BEAM OPTIMIZATION*: During optimization ASD 9th and LRFD 3rd Edition may have “selected”, as optimum, beam sizes that actually failed, and did not continue to investigate heavier beams until the correct size was found.

Effect: While optimizing sizes using the ASD 9th and LRFD 3rd Edition codes, some beams failing the pre-composite or non-composite checks were presented as optimized designs. Even though the size was not actually the size that should have been selected as the optimized size, the Failed interactions for the selected beam size was correctly reported and the color coding correctly indicated as failed. The failed beams could only be corrected through user size assignments. This could be somewhat common for multi-segmented beams and LRFD beams governed by 1.4DL combination.

 

COMPOSITE CELLULAR AND CASTELLATED BEAMS: In View/Update for composite cellular and castellated beams, the number of studs could not be modified and analyzed.

Effect: User could not assign the number of studs to be used, the program always only used the optimized number of studs.

 

RAM Steel Column

USER-SPECIFIED COLUMN BRACING*: When a new column was added in the Modeler that did not fall on an existing column line, or if a new story was added, any user-assigned column bracing was being cleared unnecessarily.

Effect: User-assigned bracing of columns (done using the Assign – Bracing command) may have been cleared and the program then used the program-calculated bracing of columns. Although usually conservative, this could result in unconservative designs if the user specified that the column was unbraced (but that information got cleared) at a level that the program determined was braced.

 

AS 4100-98 TENSION AND BENDING*: An incorrect gamma may have been used for columns under combined tensile and bending forces.

Effect: Columns under tensile and bending loads may have passed designs when an incorrect gamma value of 1.4 was used, when they should have failed using the correct higher gamma value per the requirements of AS 4100-98 Section 8.3.4.

 

AS 4100-98 COMPRESSION-ONLY: Some compression-only columns were indicated as failed for exceeding delta-b > 1.4, even though the provisions of section 4.4.2.2 were not applicable.

Effect: The provisions of section 4.4.2.2 were erroneously applied to compression-only columns. Some compression-only columns were not designed due to the erroneous application of the provision.

 

RAM Concrete Analysis

SLAB SELF-WEIGHT MISSED*: Slab self-weight was not determined and applied to two-way slabs.

Effect: Slab self-weight was missing from the slab Dead Load.

 

RAM Concrete Beam

ACI TRANSVERSE HOOP SPACING*: If there was more than one layer of flexural reinforcement and the bar sizes varied between those layers, the maximum transverse reinforcement spacing (which is based on the flexural bar diameters, see ACI 318-11 Section 21.5.3.2) for the seismic provisions may have been incorrect, failing to consider all of the bar sizes in all of the layers; the program only considered the bar sizes in the first reinforcement layer, dismissing the bar diameters of the other reinforcement layers.

Effect: Potentially incorrect (unconservative) hoop spacing.

 

RAM Concrete Column

ACI SMF TRANSVERSE SEGMENT LENGTH*: Requirements for ACI 318-11 clause 21.6.4.1 were incorrectly applied.

Effect: The length lo for transverse reinforcing may have been inadequate when ACI 318-11 21.6.4.1 applied.

 

ACI TRANSVERSE SPACING IN SMF COLUMNS: The requirements for reinforcement spacing beyond the length specified in ACI 318-11 21.6.4.1 in SMF columns was being calculated according ACI 318-11 21.6.4.4. However, those segments should be checked per 21.6.4.5.

Effect: A conservative spacing of transverse reinforcement through the central segment of SMF columns may have been specified.

 

ACI TRANSVERSE REINFORCEMENT*: When determining Vc according to clause 21.6.5.2 of ACI318-11 (or earlier), the maximum value of the axial load on the column from all load combination, rather than the axial load for each load combination, was used against the prescribed limit. This may have led to Vc not being set to zero for some load combinations as required by the code.

Effect: Transverse reinforcement may have been inadequate.

 

SQUARE COLUMNS*: In very rare instances, for some square symmetrically reinforced columns where a critical point was very, very close to the axis, there could have been differences between the interaction curves at orientation angle 0 versus 90.

Effect: In a very rare case the interaction curve data used in design may have been incorrect.

 

AS 3600-09 COLUMN DESIGN*: When AS 3600-09 was selected as the design code, in certain instances the program was using some AS 3600-01 code requirements to design columns.

Effect: Incorrect AS 3600-09 column designs.

 

EUROCODE DESIGN: When using the EC2 design code, the critical major and minor shear forces (VEd) reported in the report were not the actual critical shear forces used in design. This was a reporting only error; the correct shear forces were used in the design and could be viewed in the V/U dialog.

Effect: Report error only, the values reported for shear were incorrect.

 

CHINA GB50010 SHEAR: The shear forces for major and minor axis for the Chinese design code (GB50010) were reversed in the View/Update dialog. This was a reporting only issue; the correct forces were used in the design.

Effect: Report error only, the shear values displayed in View/Update were reversed.

 

COLUMN CURVES: In rare instances, when designing a column to the ACI design code, the column PMM curve in the View/Update dialog might have displayed incorrectly for particular angle or angles. The cause of this was an incorrect interpolation due to points on the curve that happened to be in very close proximity. This may have also lead to unexpected capacity design failure.

Effect: In rare cases column designs may have incorrectly been listed as failing, and the PMM curve diagram may have been incorrect.

 

RAM Frame – Analysis

OVERLAPPING SURFACE LOADS ON TWO-WAY DECKS*: The program may have missed gravity loads on two-way decks when there were overlapping surface loads.

Effect: Gravity loads due to overlapping surface loads on two-way decks may have been missed in RAM Frame.

 

AS/NZS 1170.2:2002 WIND LOADS*: When wind speeds were entered in metric or SI units, the values were not correctly stored, resulting in incorrect wind forces.

Effect: Incorrect wind forces. Note: to correct this error in existing models it is necessary to re-enter the AS/NZS Load Cases wind speed values.

 

CENTER OF RIGIDITY REPORT: The report showed values for center of rigidity locations for semirigid diaphragms. Center of rigidity calculations are only valid for rigid diaphragms.

Effect: Invalid values were shown for diaphragms that were designated as semirigid.

 

BUILDING STORY SHEAR REPORT: If the Building Story Shear report was generated only for a few selected response spectra cases, the reported dynamic shears were not correct.

Effect: Incorrect dynamic load case shears were reported if the report was generated for only some of the dynamic load cases; if all dynamic load cases were included, the reported dynamic shears were correct. This was a report error only, and did not affect designs.

 

INCORRECT REACTIONS REPORTED IN ANALYSIS LOG REPORT: For models with walls that terminate at a level other than the lowest level (such as for buildings with partial basements), the Analysis Log report showed reactions in X and Y directions for gravity load cases. Since gravity loads are only applied in vertical directions, no reactions for X and Y directions are expected. For such models, the program inserts foundation nodes under the wall, but the report failed to consider foundation reactions from such nodes.

Effect: Report issue only.

 

RAM Frame – Steel Standard Provisions

AISC 360-10 SECTION H1.3: The provisions of section H1.3 were erroneously applied to members subjected to both tension and compression.

Effect: Potentially conservative design of tension members. Members subjected to tension were checked for the provisions of section H1.3 when such provisions only apply to compression members.

 

SLENDER MEMBER WARNING*: In some cases slender members were not flagged as such for the AISC 360, AS 4100 and CAN S16-09 codes.

Effect: Sizes may have been indicated as acceptable even though they exceeded the slender member limits (e.g., KL/r > 200) for some load combinations.

 

RAM Frame – Steel Seismic Provisions

BUCKLING RESTRAINED BRACED FRAME REPORT: User-assigned Stiffness Modifiers (SM) were not correctly reflected in the BRBF Summary report. When the system units changed from SI or Metric to English, the reported Keff was incorrect.

Effect: The BRBF Summary Report showed an incorrect effective stiffness (Keff) for braces where a stiffness modifier was assigned. Furthermore, for reports where the system units was metric or SI, no unit conversion was performed on the reported Keff values. This was a report problem only, the code checks for all BRBF braces were correctly performed.

 

RAM Concept Link

WALLS NOT EXPORTING: Walls with 0" slab edges or slab opening offsets were not imported into RAM Concept from RAM Structural System.

Effect: Walls on perimeter of floor or at openings, with 0” edge offsets, were not included in the data exported to RAM Concept.

 

ISM / Structural Synchronizer

Several ISM defects were corrected, including several that caused the program to crash when creating or updating an ISM repository. Errors that caused models created from a repository to have problems analyzing in the RAM Structural System were also corrected. The more notable corrections are noted here.

 

PILE CAPS: The inclusion of pile caps with certain orientations caused the ISM process to crash.

Effect: Program crash during creation of ISM file. Pile caps now successfully export to ISM.

 

DUPLICATE COLUMNS: When creating a new repository, duplicate columns may have been generated.

Effect: Duplicate columns in the ISM model.

 

COLUMN HOOKS: Edge column longitudinal reinforcing bar hooks extended out of the concrete.

Effect: Bar hooks extended beyond concrete edges. Now all column longitudinal reinforcing bars end hooks are oriented towards the center of the column.

Tags: 15.05, RAM Structural System, RAM, IS 800, is 1893, IS 875

STAAD.pro Create Material Macro

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 4:21:08 PM
  
 Applies To 
  
 Product(s):STAAD.pro
 Version(s):20.07.10.41
 Environment: N/A
 Area: Modeling
 Original Author:Bentley Technical Support Group
  

Create Material Macro

The Create Material macro can quickly create new materials with industry standard property values.

First download and install the Create Material.vbs file and save it to the folder:

C:\SProV8i SS5\STAAD\Plugins\Create Material.vbs

If there is an older version of the file already there, replace it with this one.

To load the macro into STAAD.pro use Tools - Configure User Tools.

And in the Customize User Defined Tools window click New (Insert)

On the new row enter a name, like "Create Material"

and in the file selection box select the Create Material.vbs file.

Then click OK.

Afterwards, to use the tool, go to Tools - User tools, or the Hammer icon at the end of the file toolbar.

Then select the desired material from the list.

And finally check the properties of the material to make sure they are the desired values.

Tags: STAAD.Pro, material, Macro, SELECTsupport

Importing Items into RAM Concept

$
0
0
Revision 21 posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 4:47:37 PM
  
 Applies To 
  
 Product(s):RAM Structural System, RAM Concept 
 Version(s):Various
 Environment: N/A
 Area: Import/Export
 Subarea: N/A
 Original Author:Bentley Technical Support Group
  

What Is Imported?

Members  

  • All concrete members including slabs, beams, columns (above and below slab), and walls (above and below slab).
  • Slab openings.
  • Member sizes.
  • Concrete material properties.
  • Column fixity.

Loads

  • Surface loads, point loads, and line loads on members. Labels for loadings in elevated slab models will match the label in the RAM Structural System model. Labels for loadings in mat foundation models will be imported into a loading with “(Transfer)” appended to the load case name.
  • Point loads on members.
  • Line loads on members.
  • Slab and beam self-weight are always considered in RAM Concept. It is recommended to always consider slab/deck and beam self-weight in the RAM Structural System model.
  • All live loads; Reducible, Unreducible, Storage, Roof (and partition loads in Ram Concept version 5.0 and later).
  • For transfer gravity loads the user chooses which of the RAM SS analysis results to import; Ram Concrete, Ram Frame or Ram Steel. See RAM SS Analysis Types for more on why these transfer forces can vary. A Green Model Status indicator light is required for the transfer gravity load reactions to be imported into Ram Concept.  If you get a warning about zero forces, or notice a transfer load case in Ram Concept with no point or line loads on it whatsoever, check that the status light is green.  A yellow light can happen, for example, if there is an unsized steel or other material beam in Ram Concrete Analysis. 
  • Note, in Ram Concept, in order for Live Load reduction to occur the loads need to be of a reducible type and the Ram Concept - Criteria - Calc option setting for Live Load Reduction Code must be set (see below). Reducible live loads on Mat Foundations are the exception to this rule. Those loads come into Ram Concept already reduced. Reducible transfer loads for elevated slabs that are imported into RAM Concept are not reduced.

  • Wind and Seismic Load are imported as point loads at walls and columns as part of a Lateral Self Equilibrium load case (see Figure 1) . Please see RAM Concept Lateral Self Equilibrium for more information.

Figure 1. Imported Lateral Self Equilibrium Load Case.

  • In RAM Structural System v14.06.00 and earlier, all wind loads are imported as service type loadings and all load combinations are generated assuming this loading type. In RAM Structural System, wind loads that are generated using ASCE7-10 are ultimate loads, however. In models with ASCE7-10 wind loads, the loading type should be changed to ultimate loads after importing into RAM Concept (Criteria - Loadings) and, then, the load combinations should be rebuilt (Criteria - Rebuild Load Combos).

What Is Not Imported?

Members

  • Members defined with steel or other type materials in RAM Structural System. For mat foundations, if columns are modeled as steel or other-type columns, they will not be imported.
  • Composite Concrete Flat Slabs. For elevated slabs, the slab must be defined as a concrete deck in RAM Structural System. If the deck is modeled as a composite flat slab, the slab area will not be imported into RAM Concept.
  • Sloping Concrete Slabs. Sloped slabs modeled in RAM Structural System will be imported as flat slabs into RAM Concept.
  • Beam fixity. Full fixity of beams is always assumed and beams are uncracked (though treated as no-torsion beams by default).
  • Wall fixity. Wall fixity is always assumed pinned near and far.

Loads 

  • Snow loads.
  • Reactions from steel beams that transfer load to concrete slabs or beams.
  • Construction Live Loads.
  • Lateral story forces from a Rigid Diaphragm analysis.
  • Lateral nodal forces from a Pseudo Flexible or Semi-rigid Diaphragm analysis.
  • Dynamic Response Spectrum load cases (or Eigensolution)
  • Notional load cases.
  • Center of Rigidity load case.
  • Virtual Work load cases are not imported.
  • Negative point loads (In RAM Concept v3.4 and earlier).

More Information

Please see RAM Concept-RAM Structural System Integration for additional help links.

Tags: import, SELECTservices, RAM Structural System, RAM Concept, Reinforced Concrete, Ram Concrete

Other Considerations Exporting to RAM SS

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 4:52:37 PM
  
 Applies To 
  
 Product(s):RAM Structural System, RAM Concept 
 Version(s):Various
 Environment: N/A
 Area: Import/Export
 Original Author:Bentley Technical Support Group
  

Other Considerations

  • Live load reduction for column design is calculated in RAM Structural System. RAM Structural System only automatically calculates live load reduction when one-way decks are modeled. If two-way decks are modeled, the live load reduction should be assigned manually (RAM Modeler – Layout – Columns – LL Reduction – Use (specify percentage). As of v14.02, RAM Structural System does not apply live load reduction to wall members.
  • The K factor calculated by RAM Structural System is typically determined from the ACI nomographs for non-sway or sway frames. If a two-way, flat concrete slab is modeled as part of a sway frame, appropriate K factors should be entered manually for each column (RAM Concrete –Concrete Analysis mode – Assign – Columns – K factor – Use (specify factor). RAM Structural System only uses the stiffness of beams in deterring the stiffness of flexural members. If nomographs are used to calculate the K factor for this system, the stiffness of flexural members framing into the column will be taken as 0 and a K factor of 3 will be used by the program.
  • If you are using Ram Foundation to design foundations supporting Concrete Columns, those foundations will not be designed including the Hyperstatic forces from post-tensioned levels above.

More Information

Please see RAM Concept-RAM Structural System Integration for additional help links.

Tags: SELECTservices, RAM Structural System, RAM Concept, Export, TechNote, Ram Concrete

Other Considerations Importing Into RAM Concept

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 4:53:58 PM
  
 Applies To 
  
 Product(s):RAM Structural System, RAM Concept 
 Version(s):All
 Area: Import, Modeling
 Original Author:Bentley Technical Support Group
  

Other Considerations

Column and Wall Locations must Match

The locations of columns and wall cannot be changed in RAM Concept. If the support locations must be changed, the RAM Structural System model should be modified and re-imported into RAM Concept.

Beams and Slabs Can Deviate

Adjustments to slab areas and beam elements (geometry, sizes, etc) can be done in RAM Concept following import of the RAM Structural System model. Any change affecting lateral members may alter the load path of lateral loads and should also be made in RAM Structural System.

Important - if you are making changes to the slab, drop caps beams or openings in Ram Concept Mesh Input - Standard Plan, then it's important not to update those objects when Syncing to the RAM SS model later. Simply uncheck those items from the File - Sync Ram - Update from RAM Structural System... dialog box, or similarly unchek those items from Ram manager - Design - Ram Concept as indicated below.

Beams in RAM Concept are meshed with the slab. For continuous beams modeled in RAM Concept, it is not necessary to model the beams in segments from column to column. Meshing problems are often prevented by modeling continuous beams as one beam segment from outside face of the first column to the outside face of the last column bypassing each intermediate column. Beams modeled in RAM Structural System are modeled support to support. When the beams are imported into RAM Concept, they are brought into the program as segmented members between each support. In most cases, there will be multiple overlapping areas at the column (see Figure1 below). Since this can produce meshing errors in some cases, it is often easier to not import beams and then create them in RAM Concept after the model is imported and modeling as a continuous beam (see Figure 2 below). 

 Figure 1. Beams Segmented at Column After Importing.

 

 Figure 2. Model Beams as Continuous Beams in RAM Concept.

The slab in the RAM Concrete and RAM Frame analysis is assumed concentric with beam elements (i.e. the slab passes through the centroid of the beam section). The slab in RAM Concept can be modeled at any elevation, and slab and beam systems will be imported with the slab at the proper elevations. In RAM Concept, the difference in centroid between the beam and slab element produces an eccentricity that will produce additional moments in T-shaped beams from the axial forces in the slab and beam elements. There is no eccentricity of axial forces in beams and slabs in the RAM Structural System model. Please see RAM Concept T-Beam and Axial Forcefor more information.

Beam and Slab Cracked Properties

Slab cracked section factors in RAM SS are imported and used in the Ram Concept Slab Behavior properties. When performing a cracked section analysis in Concept as part of a detailed Service Design Rule Set or as part of a Load History Analysis, the behavior properties for the slabs should be reset to standard values (1.0) to prevent double counting of the cracked stiffness reduction.

Imported beams are set to no-torsion beams by default. The other bending cracked factors are all set to 1 and there are no end releases for beams possible in Concept regardless what was entered in RAM SS.

Dynamic Response Spectrum Load Cases

Currently, there is no way to import the results of a dynamic response spectrum analysis from RAM Frame into RAM Concept. There are two basic approaches to dealing with this limitation:

(1) In RAM Frame, create an “equivalent” static load case using a User Defined Story Force, one that generates the same total shear at each level (usually determined from the building story shear report). Then import the reactions from this static load case into Concept.

(2) In Concept, manually create a new seismic load case (Criteria – Loading – New, with type normal). On the load layers for that loading, add point loads (or line loads) based on the reactions from RAM Frame. Be aware, that a dynamic analysis, by default, produces forces all of like sign. If you are not already considering sign in the RAM Frame analysis (Criteria – General), we suggest you do so. Otherwise, manually establish the probable sign for each of the reactions so that the forces input into Concept represent a concurrent event.

Templates

Currently, there is no way to use Ram Concept template files when generating a new Concept file from RAM Structural System. Furthermore, design rules and load combinations are rebuilt each time the model is imported.

More Information

Please see RAM Concept-RAM Structural System Integration for additional help links.

Tags: import, RAM Structural System, RAM Concept, template, Concrete Design, cracked, Ram Concrete

Exporting Items to RAM Structural System [TN]

$
0
0
Revision 12 posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 4:56:01 PM
  
 Applies To 
  
 Product(s):RAM Structural System, RAM Concept 
 Version(s):Various
 Environment: N/A
 Area: Import/Export
 Original Author:Bentley Technical Support Group
  

What Is Exported?

Reactions 

  • Dead Load, Live Load Reducible, Live Load Unreducible, Live Load Storage , Live Load Roof, and Balance Loading reactions. 
  • Balance loading reactions are exported to a hyperstatic load case in RAM Concrete. Exporting balance load reactions will require re-running the analysis and regenerating load combinations in RAM Concrete. 

Geometry

  • Slab areas.
  • Slab openings
  • Beams. These are exported as two-way slab areas.
  • Columns below the slab.
  • Walls below the slab.
  • Reactions from load cases that do not appear in RAM Structural System.
  • Reactions from transfer load cases.

What Is Not Exported?

Reactions

  • Reactions from loads cases that do not appear in RAM Structural System.
  • Reactions from transfer load cases.

Geometry

  • Column above the slab.
  • Walls above the slab.
  • Surface loads, point loads, and line loads.

More Information

Please see RAM Concept-RAM Structural System Integration for additional help links.

Tags: SELECTservices, RAM Structural System, RAM Concept, Export, TechNote, Ram Concrete

Common Errors and Warnings When Importing into RAM Concept[TN]

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 4:59:05 PM
 Product(s):RAM Structural System, RAM Concept 
 Version(s):Various
 Environment: N/A
 Area: Import/Export
 Original Author:Bentley Technical Support Group

Common Errors and Warnings

  • Any load case or applied load in the RAM Structural System model that is not imported into RAM Concept will be identified in the Warnings Section of the RAM Import Status dialog. For more see Importing Items into Ram Concept.

  • A Partial Failure will be produced when any of the analysis forces for a particular load case are very close to zero. This does not mean that there is a problem with the imported loads, and the message can be ignored. This warning will be revised in RAM Concept v3.5.

  • Any imported area loads, line loads, or point loads that are not modeled on a slab will generate a warning in RAM Concept and will be ignored in the analysis. This warning is most often associated with loads defined within an opening in RAM Structural System.

Importing slab openings that cross walls can cause meshing errors and instability in Ram Concept.

Typically, when modeling openings in RAM SS that are side by side, users will use the Add Slab Opening - in Bay option, clicking in each bay. With this approach the common edges for the inner wall are automatically removed leaving one larger, merged opening. This is a good practice for most structures, but has one side effect for models that are being integrated with Ram Concept. 

When imported to Ram Concept, the larger opening prevents any slab from remaining along the center wall:

And this leads to wall meshing errors like this:

As well as an instability since the wall inside the opening can now fall over out of plane.

The error can be fixed directly in Ram Concept by adding a sliver of slab (or a beam) along the wall from one side of the opening to the other. Alternatively, the errors can be prevented by modeling two distinct openings in RAM SS from the beginning.

This is one case where using construction grids and 0" overhang slab opening edges is advised. The resulting Concept model will also have 2 distinct openings and the wall in the middle will be OK.

Dealing with partial levels

If a RAM Structural System model has a partial level that does not encompass all of the concrete columns (and/or walls) on a particular story, those columns will be excluded from the Concept model. If they were included, they could result in instabilities as noted above. 

Consequently, if the Column Gravity Reactions are saved back to the RAM SS file, no data will be available for those columns. 

If the Ram Concrete Analysis is rerun using forces from Concept at that story, you will then get a warning that indicates, No Concept forces...

RAM SS model with column #4 at A-1RAM Concept without Column #4

In those cases, Ram Concrete Analysis will continue to use the original Concrete Analysis forces for those specific columns (at the affected stories).

More Information

Please see RAM Concept-RAM Structural System Integration for additional help links.

Tags: import, SELECTservices, RAM Structural System, RAM Concept, TechNote, Ram Concrete

RAM Concept-RAM Structural System Integration [TN]

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 5:01:34 PM
Applies To
 Product(s):RAM Structural System, RAM Concept 
 Version(s):Various
 Environment: N/A
 Area: Import/Export
 Original Author:Bentley Technical Support Group

Overview

This page is the landing page for user help when integrating RAM Concept models with RAM Structural System. Please use the links below to access the desired help pages. Additional information can be found in the RAM Concept Manual; see Sections "Importing a Database from the RAM Structural System" and "Exporting a Database to the RAM Structural System."

Importing Data from RAM Structural System into RAM Concept

          What Is and Is Not Imported

          Common Errors and Warnings

          Other Considerations

Exporting Data from RAM Concept to RAM Structural System

          What Is and Is Not Exported

          Other Considerations

Important notice regarding version compatibility

Starting with RAM Structural System version 14.06 and Ram Concept version 5.1, both programs are offered as either 32 or 64 bit applications. In order to integrate the two programs using the methods described in this wiki both must be alike in this regard, so be consistent and install the 32 or 64 bit versions of both applications.


On My SELECT CD or the Software Fulfillment Center, the 64 bit versions are labeled with the x64 suffix. The 32 bit versions have no suffix. The 32 bit versions will work on either a 32 bit or 64 bit machine, but the 64 bit versions require a 64 bit operating system.

See Also

Unlinking Ram Concept Files from RAM SS

Ram Concept files lost Converting RAM SS models from 14.05 to 14.06

RAM Concept Lateral Self Equilibrium Analysis

Tags: import, SELECTservices, RAM Structural System, RAM Concept, Export, Reinforced Concrete, Ram Concrete

Modeling Podium Slabs

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 5:04:46 PM
 Applies To 
 Product(s):RAM Concept, RAM Structural System
 Version(s):Various
 Environment: N/A
 Area: Modeling; Analysis
 Original Author:Bentley Technical Support Group

Overview

Podium slabs are concrete transfer slabs supporting multiple levels of wood or steel framed superstructures above. This popular framing system can be analyzed and designed using RAM Structural System and RAM Concept. The purpose of this tech note is to discuss issues and common questions relating to the modeling and design of this system using these programs.

Modeling Options

Two common options for designing this type of structure include:

1. Use a two-stage analysis in which the upper portion and lower portion are designed as separate structures in RAM Structural System. See ASCE7 12.2.3.2 for details.

2. Model the entire structure in one model in RAM Structural System.

Regretfully, there is not an automated two-stage analysis feature in RAM Structural System. This means that loading from one model needs to be manually entered in the second. One possible work around:

  1. Model and analyze the upper portion in RAM Structural System with a mat foundation.
  2. Import the mat foundation into RAM Concept.
  3. Add columns  to convert the model to an elevated slab.
  4. Amplify imported loads to satisfy ASCE7 12.2.3.2.
  5. Add lateral and additional gravity loads on lower portion in Concept.
  6. Analyze and design.

With this approach, foundations will need to be designed manually using the analysis results from RAM Concept. There is not a way to import them into RAM Foundation for design. Also, the lateral analysis for the lower floor is done in RAM Concept. This will not work well if there are multiple concrete levels below the upper portion.

RAM Structural System Tips

In RAM Modeler, live load reduction percentages should be modeled manually for columns and walls supporting two-way decks. See the following web page for more information on using two-way decks in RAM Structural System:

RAM SS Two-Way Decks

For any transfer slab the out-of-plane stiffness should be considered when analyzing lateral load cases. For details refer to How does the diaphragm out-of-plane stiffness affect behavior?

It is important that all walls fit on the podium slab. If any wall extends outside the podium slab edge, unintended foundation supports can be added in the model. The reaction at the foundation support would not be transferred to the podium slab. This problem most often occurs at walls that are skewed to the global x or y axes and the slab edge segment is modeled continuous past the wall end. To prevent this from occurring it is best to snap slab edge segments directly to walls ends near the slab boundary. Displaying reactions in RAM Frame (Process – Results – Reactions) is a good way to check for unintended foundation supports. See reaction points circled in the screenshot below for an example of an unintended foundation support.


 

In RAM Frame, pseudo-flexible or semirigid diaphragms are the best options for models at wood framed levels. If walls are skewed relative to the global x and y axes in plan, then semirigid diaphragms should be used. See the following web pages for more discussion on these diaphragm types.

RAM SS Pseudo-Flexible Diaphragms

RAM SS Semirigid Diaphragms

In RAM Frame, the in-plane flexural stiffness of lateral walls above the podium level is always considered. As a result, the walls will be meshed with the podium slab and act as a stiffening element. This can produce significant moments at the base of the transfer walls. In most cases, loads are assumed to transfer directly from the wall to the slab, ignoring the wall stiffness above.

In RAM Concrete, there is an option to ignore the stiffness of walls above the slab. This option is located in the Analysis Criteria dialog in RAM Concrete – Concrete Analysis mode (Criteria –Analysis). Check the box for “Ignore Wall Stiffness on Above Story” to ignore the stiffness of the walls above.

More discussion on walls in RAM Structural System can be found on the following web page;

RAM SS Wall FAQs

In RAM Concrete, skip live load cases can significantly increase analysis time. Many models with podium slabs containlevels with many “other” type beam members. If the “Skip-Load the Live Load on Non-Beam Line Beams” is checked in RAM Concrete Analysis – Analysis – Criteria, the program will skip the live load on all of the “other” beams. Typically, this is not intended and the box can be unchecked.

RAM Concept Tips

RAM Concept offers three options for import of gravity forces: forces from RAM Steel, forces from RAM Concrete, and forces from RAM Frame. Generally, it will be best to use the RAM Steel forces as the first preference when importing. In RAM Steel, load is distributed to members based on a simple tributary area. The wall stiffness is considered in both RAM Concrete and RAM Frame. The transfer wall moments may be significantly higher if RAM Concrete or RAM Frame forces are selected with a higher priority than the RAM Steel forces.

When importing gravity forces from RAM Steel, line and point loads are converted to an equivalent load at the base of the wall assuming the wall is a rigid element. Point loads that are eccentric to the center of the wall will translate to moments and a non-uniform load at the base of the wall. Segmentation of the wall will affect the transfer wall load that is imported into RAM Concept. See example below:


  

Each wall is 20 ft long. The wall on the left is modeled with one wall segment. The wall on the right is modeled with two wall segments; there is a 1-ft segment near the end of the wall. Each wallhas a 10 k/ft live load and a 10 k point load located 1-ft at the wall end (same point where the right wall is segmented).

The following line loads are imported into Concept:

  

The line load on the left has a magnitude of 11.8 k/ft at one end and 9.15 k/ft on the other. These loads are calculated from:

10 k/ft + (10 k)/(20 ft)  +/- (10 k)*[(20 ft/2) - 1 ft)]/[(20 ft)^2*6]  = 11.85 k/ft and 9.15 k/ft

The line load on the right is divided into two segments, representing the 1-ft wall segment and the 19-ft walls segment.

The 1-ft wall segment has a magnitude of -0.008333 k/ft on one end and 29.99 /ft on the other. These are calculated from:

10 k/ft + (10 k/2)/(1 ft)  +/- (10 k/2)*[(1 ft/2)]/[(1 ft)^2*6]  = 30 k/ft and 0 k/ft

The 19-ft wall segment has a magnitude of 11.05 k/ft on one end and 9.473 k/ft on the other end. These loads are calculated from:

10 k/ft + (10 k/2)/(19 ft)  +/- (10 k/2)*[(19 ft/2)]/[(19 ft)^2*6]  = 11.05 k/ft and 9.473 k/ft

In this example, modeling the wall in one segment will result in more accurate loads in RAM Concept.

For elevated slabs, live loads are always imported as unreduced live loads. If you would like to account for live load reduction you can either reduce the loads manually after importing or manually assign live load reduction parameters in the Live Load Reduction tab of the Span Segment Properties dialog. See below:

For mat foundations, reducible live loads are reduced when they are imported into RAM Concept. If you are using a two-stage analysis, set the Code for Live Load Reduction to “None” after importing to ensure the loads are not reduced twice.

See Also

RAM SS Two-Way Decks

RAM SS Pseudo-Flexible Diaphragms

RAM SS Semirigid Diaphragms

RAM Frame - Wind Loads FAQ

RAM SS Wall FAQs

Tags: RAM Frame Analysis, RAM Structural System, RAM Concept, Transfer, Concrete Design, Ram Concrete, podium

RAM Concept Lateral Self Equilibrium Analysis [TN]

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 5:06:24 PM
 Applies To 
 Product(s):RAM Concept
 Version(s):Any
 Environment: N/A
 Area: Analysis
 Original Author:Bentley Technical Support Group

Lateral Self-Equilibrium Analysis

Any static loading on a structure, when combined with the structure support reactions (considered as additional loads), is a self-equilibrium loading. In such a loading the total loads upon the structure are in force and moment equilibrium. However, the equilibrium loads still produce moments and forces in the structure.

In certain cases, it is desirable to analyze a self-equilibrium loading upon a floor system while ignoring the effects of the floor system supports. We call this type of analysis a self-equilibrium analysis.

Uses of Self-Equilibrium Analyses

The most common use of self-equilibrium analyses is to ensure that a load path in Concept is consistent with a load path in a lateral analysis performed by a separate program.

If a lateral analysis of a building (perhaps using RAM Frame) is performed, and that analysis considers the slab to be part of the lateral load path, the slab (including the slab-column connections) needs to be designed to resist the forces and moments determined in the lateral analysis. This design can be performed using a self-equilibrium analysis. The forces/reactions from all of the supports (above and below the slab) onto the slab are considered as loads to the slab.

The result of this self-equilibrium analysis is a slab load path that is fully consistent with the lateral analysis of the entire building. The distribution of forces (and the displacements) within the slab may not match those in the building lateral analysis, but the distribution of slab forces in Concept is almost always more accurate than those predicted in the full building analysis.

There is no limit to the type or quantity of loads that can be applied in a self-equilibrium loading. However, the loads applied must be nearly in self-equilibrium. If the loads are out of equilibrium Concept will apply restraints to the slab to ensure that equilibrium can be maintained. The restraint reactions can be viewed in the Calc Log.

Note: See Chapter 14, “Importing a Database from the RAM Structural System” for information on how to automatically import self-equilibrium lateral loads.

Note: Mat/Raft foundations are typically not well suited for self-equilibrium analyses as the soil reactions are not known before the analysis.

Self-Equilibrium Analyses Details

“Floating” Stiffness Matrix

If you use self-equilibrium loadings, Concept creates an internal floating stiffness matrix in addition to the regular stiffness matrix. The floating stiffness matrix considers the slab, but not the supports above or below the slab. Concept also adds some minimal supports to the matrix to make it stable.

Minimal Supports

The minimal supports that Concept adds to the floating stiffness matrix are located at real support locations, but not at every real support location. Typically, Concept adds three supports to provide full stability, but not to provide any restraint.

Note: Concept gives a warning if there are not at least two support locations where minimal supports can be added. The motivation for adding the minimal supports at the same location as real supports is that these locations are likely to be locations where self-equilibrium loads are applied, so any reactions at these locations can typically be considered as “corrections” to the self-equilibrium loads.

Punching Check Reactions

Punching checks consider the loads applied at the punching check location in their reaction calculations. Punching checks are the only “support” that have reactions from self-equilibrium analyses.

Displacements

Concept reports all displacements for self-equilibrium loadings as zero. Self-equilibrium loadings have no effect on the displacements calculated for load combinations or rule sets.

Pattern Loading

Pattern loading can be used in a self-equilibrium analysis, but it should almost never be used. When used, all patterns should contain a self-equilibrium set of loads.

 

Example 

Perhaps the best way to understand Lateral SE could be this simple example:

Consider the structure with two elevated floors shown in the Figure below. Each level is 3m high and the structure is 10m wide.

 

Assume the following:

  • a frame analysis has been performed on the building for this 100kN loading and the column forces are known
  • a very simple distribution of forces (reasonable for beams much stiffer than columns)

The forces on the top level slab (including column reactions) are:

Fx0 = 100kN
Fx1 = -50kN      Fx2 = -50kN
Fz1 = -15kN      Fz2 = 15kN
My1 = 75kN-m     My2 = 75kN-m

These forces are in equilibrium and are applied directly to the slab in a lateral SE loading. Concept then calculates the correct forces in the slab, design strips and punching checks.

For the intermediate level there are more forces to consider (all of these are from the frame analysis). The forces that the columns apply to the slab are:

Fx3 = 50kN       Fx4 = -50kN
Fx5 = 50kN       Fx6 = -50kN
Fz3 = 15kN       Fz4 = -45kN
Fz5 = -15kN      Fz6 = 45kN
My3 = 75kN-m     My4 = 75kN-m
My5 = 75kN-m     My6 = 75kN-m         

These forces are in equilibrium and are applied directly to the slab in a lateral SE loading. Since the “3” and “4” forces occur at the same location, they can be added together and applied as a single load (same for “5” and “6”).

Concept then calculates the correct forces in the slab, design strips and punching checks.

Note: There is one simplification - if you do not care about diaphragm forces, then you can ignore all the Fx and Fy forces. This assumes that the Fx and Fy forces act at the center of your slab and that the centroid elevation of your slab is constant. When these two assumptions are not true, the effects of these forces are typically still not large, but you may need to use some judgment before you ignore them.

Note: Ram Structural System lateral loads will generally be exported to Ram Concept in a self-equilibrium state, but user defined lateral nodal loads, especially those that include vertical (z direction) forces will not be in equilibrium and as such, those should only be processed as Normal analysis loads in Ram Concept.

Tags: SELECTservices, RAM Concept, TechNote, Loads, Lateral SE, seismic, Wind

Very Small Lateral SE Forces from Ram Frame

$
0
0
Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 7/11/2017 5:07:32 PM
 Applies To 
 Product(s):RAM Concept; RAM Structural System
 Version(s):5.2 and 14.07 or later
 Area: Import/Export
 Original Author:Bentley Technical Support Group

Why are the column reactions in the Lateral loads so small?

In Ram Structural System 14.07 a change was made in the behavior of 2-way slabs under lateral loads. To prevent the slab from coupling lateral walls and columns together the out-of-plane stiffness is ignored in those lateral load cases when the diaphragm is set to rigid. With the out-of-plane stiffness near zero, the unbalanced forces in lateral columns above and below the slab are necessarily tiny.

Solution

In order to have the out of plane stiffness considered under lateral loads the diaphragm at the level being exported to Ram Concept must be set to semi-rigid

See Also

RAMSS Two Way Decks

RAM Frame - Criteria - Diaphragms

Tags: import, RAM Structural System, RAM Concept, Lateral SE

ISM Change Management - Accepting Some Modified Properties but Rejecting Others

$
0
0
Current Revision posted to RAM | STAAD Wiki by Josh Taylor on 7/11/2017 6:00:45 PM
 Product(s):ISM (Structural Synchronizer)
 Version(s):All
 Environment:N/A
 Area:Change Management
 Subarea:Accepting Changes to Object Properties

Problem

While updating an ISM repository with changes made in an ISM-enabled application, more than one type of change has been made to a large number of specific objects. For example, changes were made to both the location and member section size for several concrete columns in a model. For all columns, we would like to accept ONLY the change to the section size and reject the change in location. How can this be done without selecting each modified column individually?

Solution

The short video below shows the steps that can be taken in the ISM Viewer to make the changes described above on all modified objects at once.

(Please visit the site to view this video)

ISM Solutions and Best Practices

$
0
0
Current Revision posted to RAM | STAAD Wiki by Josh Taylor on 7/11/2017 6:04:50 PM

Best Practices Documents

Modeling and Node Generation Best Practices

STAAD.Pro Loads and ISM 

ISM Revit Plug-in

ISM Import into Tekla Structures

ISM Change Management - Accepting Some Revised Properties but Rejecting Others

Installation

How can I find the ISM installer?

Can't Install the 32-bit Version on a 64-bit Operating System

Synchronizer Won't Install due to Prerequisites

ISM Toolbar Buttons Grayed out

Solutions

Boundary Is Not Valid Error

Cannot Find Suitable RSS Level for the given ISM Curve Member

Disable ProjectWise Integration with ISM

Error-Could not start a Responsive Engine

How to remove incorrectly mapped section properties while importing ISM repository into STAAD.Pro

ProStructures ISM Section and Material Mapping

ISM - IFC Import Details

ISM 8.11.09.130 crashes on startup

ISM Import or Export Unhandled Exception Occurred 

ISM Import to RAM Elements Beams Not Segmented

ISM Log Files

ISM Nodes into RAM Structural System

ISM Rotate RAM Model

ISM Section mapping and STAAD.pro

ISM Toolbar Buttons Grayed Out

Not a Valid ISM DGN Repository Exception

RAM Manager Crashes when using ISM - New From Repository

Ram SS - ISM Missing Rebar or Deleting All Objects on Update

SACS - ISM Import of Plates (Walls & Slabs)

Tekla Structures v.20 ISM Mixed Mode Assembly Error

Not Able to Import/Export with ISM in STAAD.Pro

Unable to create host MainForm error in STAAD.Pro

Tags: best practices, install, structural synchronizer, Revit plugin, ISM, Solutions

The XML page cannot be displayed - Calculation sheet is not available

$
0
0
Current Revision posted to RAM | STAAD Wiki by Sye on 7/11/2017 7:36:30 PM

  
 Applies To 
  
 Product(s):STAAD.Foundation
 Version(s):ALL
 Environment: N/A
 Area: General Foundation
 Subarea: 
 Original Author:Sye Chakraborty
Bentley Technical Support Group
  

I am getting an error message as shown next when I go to view the Calculation sheet. What can I do to resolve the issue ?

Ensure that you do not have any special characters like say "&", "#", "%" etc. in the file name and also in the job name. Check the names of the individual folders and subfolders, in the path where the file is being saved, for any special characters. Also avoid having spaces in the folder/subfolder names. Avoid using special characters while naming the load cases and combinations. This should take care of the problem. 

Tags: STAAD Foundation Advanced, XML error, Calculation Sheet is not available, Calculation Sheet cannot be displayed, The XML page cannot be displayed, XML, Error in calculation sheet
Viewing all 8748 articles
Browse latest View live


<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>