• Modelling an Elevated Slab as Plates in combination with Floor Diaphragm Command

    Good day. I understand that for rigid diaphragm slab action, you are NOT required to model the slab as plates if you are to use the Floor Diaphragm command. But for this frame structure that I am working with, there are certain floor loads that…

  • Rigid diaphragm nodes deleted RAM Elements v16.07.00.248 Release

    Hi, there! Some rigid diaphragm nodes get deleted when run the analysis in RAM Elements v16.07.00.248 release . Is it a bug? 3566.BugReport.zip

  • Incorrect results in structures with rigid diaphragms and offsets in y direction

    When aplying Master/Slave node on a floor that contains beams with offsets in "y" direction, I obtain incorrect results of Mz and shear y for vertical loads, but after eliminating these offsets, the results become correct. Why?

  • Centre of rigidity report

    Good day, I have completed a model in STAAD Pro utilising the floor diaphragm command to account for the effects of eccentricity, but there appears to be an anomaly in the centre of rigidity report. All the nodes in my model have been placed in the…

  • Floor slab design

    I am designing a floor slab for the below mentioned view of the building. In the plan view the center part of the portion is to be left empty and the remaining area should be covered by slabs. In how many ways can i design a slab to account for both the…

  • RIGID DIAGRAM ERORR

    rigid denemelri bos example.STD Im trying to create a rigid diaphragm, I created reference load as mass load but still getting the same error, what do I need to do to avoid this error and create rigid diaphragm? Thank you, Jeff STAAD SPACE…

  • RE: Floor Diaphragm

    Having the rigid floor diaphragm specified allows you to model the lateral stiffness due to the diaphragm which you will not get if choose not to include it. Moreover the rigid floor diaphragm has the ability to automatically figure out the torsion due…

  • RE: Accidental torsional moment vs. natural torsional moment staad

    Natural torsion or inherent torsion accounts for the additional moment resulting from eccentricity between the center of mass and center of rigidity whereas Accidental torsion accounts for the additional moment due to a shift in the center of mass from…

  • RE: STAAD Pro. Composite Deck vs Diaphragm Action

    A composite deck is not equivalent to defining a rigid diaphragm. It assigns the composite properties to the beams based on the effective width of the slab. However it does not make the floor completely rigid. It also does not account for the torsion…

  • RE: Modeling with plates

    The higher moments in beams for structure 1 is due to the fact that the beams are carrying the whole moment from the applied load whereas when a slab is modeled using plates, it is sharing moments and shears too causing the beam to take less. The story…

  • RE: Modeling Roof and Floor Diaphragms in Staad Pro V 8i

    Here are the answers to the questions 1. A steel roof deck without concrete filling or a checkered plate floor are usually not considered as rigid diaphragm and so using master slave ZX will not be appropriate. If you would just want the loading on…

  • RE: Master Slave command

    I agree with what Amir’s observation. Instead of defining rigid master slave connection, I would suggest you to use the rigid floor diaphragm command to model the diaphragms. This would require small changes to be made to the model but it would help you…
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