Revision 9 posted to Structural Analysis and Design Wiki by Sudip Narayan Choudhury on 8/29/2013 6:01:37 AM
STAAD.Offshore FAQs
| Applies To | |||
| Product(s): | STAAD.Offshore | ||
| Version(s): | All | ||
| Environment: | N/A | ||
| Area: | Frequently Asked Questions (FAQs) | ||
| Subarea: | N/A | ||
| Original Author: | Bentley Technical Support Group | ||
1.
Regarding the Transportation module in STAAD Offshore, there is a Gravity/Tilt option on the Transport Definition/General page. When this is turned on it appears that STAAD Offshore generates static load components in the vertical and horizontal directions based on the tilted position of the structure on the ship. These static components are included in the overall inertia loads and transferred into STAAD Pro. Our question is: since the STAAD Offshore loads already include a static component should the static (gravity) loads in the STAAD Pro load combinations be excluded when analysing for transportation cases? If they are included it appears that we are "double-dipping" on the static loads and resultant vertical loads are too high.
When you are analyzing with the transport loads in STAAD.Pro, you need not consider the self-weight loads separately in the load combinations because you have already considered the inertia force due to acceleration due to gravity in the STAAD.Offshore Module, which is the selfweight of the structure. This is in addition to the inertia force generated due to acceleration of the barge on which the structure is being transported.
2.
CanwespecifyMarineGrowthabovetheStillWaterLevelinSTAAD.Offshore?
No,wecannot.AspertheAPIcodeclause1.3.8,theMarineGrowthisthemostneartheMeanWaterLevelbutcanbesignificant200feetorbelowtheMeanSeaLevel.TheSTAAD.OffshoreisdesignedtotakethemarinegrowthdataatandbelowtheStillWaterLevel.