How to find out axial forces ( tension and compression ) in members


Applies To
Product(s):STAAD.Pro
Version(s):ALL
Environment: ALL
Area: Postprocessing workflow
Subarea:  
Original Author:Sye Chakraborty, Bentley Technical Support Group

 

I would like to find out the axial tension and compression in the members. How can I do that ?

There are a couple of ways to do this.

You can refer to the Beam End Forces table from within the Post Processing mode as marked below. The Fx column would give you the axial forces. When Fx has negative sign for the first node and positive sign for the second node, it would mean axial Tension. When Fx has positive sign for the first node and negative sign for the second node, it would mean axial Compression.

 

The above would give you the axial forces for each member on a load case by load case basis.

If you need to find out the max compression or maximum tension in the members, a good way would be to use the PRINT MAXFORCE ENVELOPE command as part of the input command. The command could be placed anywhere after the ANALSYSIS command and before the FINISH command. The software would then print the following output in the analysis output file. The FX column would show the min and max axial forces considering all the load cases. Compression and Tension would also be indicated by the C and T following the force value.