• Floor diaphragm with voids/holes

    There are large holes/voids in the floor of my structure (required to accommodate equipment), so I need to model void/holes in my floor diaphragm. What's the recommended modeling procedure for this?

  • FLOOR DIAPHRAGM

    Good day everyone. I am having trouble with these messages. please see below *** NOTE: If any floor diaphragm is present in the model Wind Load definition should be defined after Floor Diaphragm definition. Otherwise wind load generation may be unsuccessful…

  • 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…

  • Floor Diaphragm with Temperature load

    Hi, In my multi level steel Structure I'm experiencing more axial loads when I define Floor diaphragm with temperature loads as there are Precast concrete slab are there on my floors. If I'm ignoring Floor diaphragm action on floors, displacement was…

  • *** ERROR: NOT ALL JOINTS LIE AT THE SAME FLOOR LEVEL.

    Good Morning Everyone, I am analyzing a conveyor support and housing, The structure is located on a pier thats why I added WL & EL. However, there is an error on analyzing the file. Please help me. The nodes are on the same level. Also, please…

  • Error, Invalid Floor Diaphragm Definition. Command is ignored

    I am getting the above mentioned error in the Staad Editor. Below is the code STAAD SPACE START JOB INFORMATION ENGINEER DATE 23-Jun-21 END JOB INFORMATION INPUT WIDTH 79 UNIT INCHES KN JOINT COORDINATES 1 0 0 0; 2 138 0 0; 3 300 0 0; 4 0 0 162; 5 138…

  • Instability warning after applying Floor Diaphragm

    after applying floor diaphragm I am getting instability warning at mater joints please check my model and tell how to remove this warning 2061.major1 Wind.STD

  • Floor Diaphgram and Moment Release

    0245.struc.STD 1) After applying floor diaphgram i am getting following warning *WARNING- ZERO STIFFNESS IN DIRECTION 2 AT JOINT 32 EQN.NO. 188 ***WARNING - INSTABILITY AT JOINT 980 DIRECTION = MY 2) Have i applied the moment release correctly…

  • 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…

  • REFERENCE LOAD

    Dear Members, I read several posts on reference load and even Tech Notes http://communities.bentley.com/products/structural/structural_analysis___design/w/structural_analysis_and_design__wiki/4014 But still have some doubts. I am writing here some…

  • 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…

  • RE: Center of rigidity and Center of mass of floors with staad pro. Important Questions!!!

    The answers to your questions are 1. Although the center of mass and center of rigidity are not printed in the tables like those in the post processing mode, but these can be printed as part of the analysis output file. When one defines a rigid floor…

  • Floor Diaphragm, Composite Deck and Plate element

    1. Does STAAD.Pro consider the Floor Diaphragm Action (transfer of lateral forces to the columns) when the Composite Deck feature is applied? 2. Considering the Floor Diaphragm Action, can i use plate elements instead of Master/Slave or Floor Diaphragm…

  • RE: Printing Story shear and story stiffness in STAAD pro

    In recent SS5 version of STAAD.Pro the floor diaphragm can be defined using the GUI. You need to go to General > Spec and click on the Node button to get the Node Specification dialog box. You will find a new tab called Floor Diaphragm using which the…

  • Floor Diaphragm when Set Z Up

    I am trying to create a rigid diaphragm in a plane. I am unable to use FLOOR DIAPHRAGM command because I have SET Z UP command used. The project requires me to have the Z axis as the gravity axis. Is there any way I could model a rigid diaphragm without…
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