Applies To | |||
Product(s): | RAM Structural System | ||
Version(s): | Any | ||
Environment: | N/A | ||
Area: | Analysis | ||
Subarea: | N/A | ||
Original Author: | Bentley Technical Support Group | ||
The Ram Frame analysis completes but indicates there are warnings, where can I find more?
Use the Report - Analysis Log to get further details. Warnings are listed at the beginning of the report under "Summary of Numerical Behavior of Model". The most common illustrated below:
- Local instability at or near Node # (0.00, 0.00, 12.00)
- Line Load on Wall # of Story "Roof" Found (starting at 0.000 ft and ending at 8.916 ft). The Portion of this load over Opening Ignored in Analysis.
- Beam 62 (Roof) Has Larger Rigid End Zone Lengths (REZ) Than Member's Length. REZs Set to Zero.
1. Local, instabilities. The instability wiki discusses some common causes for these. Typically they occur where all the frame members at a joint are pinned leaving the node free to rotate.
2. Loads on walls partially ignored. This happens when an opening in a wall crosses a story line when there are floor decks/loads or line loads modeled on the floor that is met or crossed. The plan view does not show these openings so the elevation view should be used to review these conditions. Note, it’s only the loads from one-way decks, lines loads and wall self-weight affected by the warning, loads from meshed 2-way decks are still considered. Wall self-weight is affected because wall weight is calculated for the wall segment and applied as a line load at the top of the wall.
3. Rigid end zone warnings. These tend to happen when the length of the Rigid End Zone based on intersecting beam and column dimensions is greater than the center to center length of the member. In those situations, the original center to center length is used in the stiffness matrix for the affected members.
The next section, "Summary of Equilibrium Check of Model" includes the total reactions for each loading. The program includes the nodal reactions of all columns and walls even if they terminate higher than the base, so the sum of the reactions can be checked against the total applied loads to confirm equilibrium, Small deviations are expected when performing P-Delta analysis.
Note, the summation of moments is now reported about that global model origin so that overturning equilibrium can also be evaluated. In older versions (< v14) the reported moments were a simple summation of the column base moment reactions. Refer to the Modeling wiki for more on story height and how it affects the elevation of rigid diaphragm lateral loads
See Also
Structural Product TechNotes And FAQs
RAM Instability In Finite Element Analysis
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