Perforated beam modeling using shell elements in SAP200

[Ani1989]

Hello everyone,
I am modeling a moment frame with perforated beam in SAP2000. I am modeling it for earthquake design using a response spectrum, the analysis is a nonlinear one.
When I run it the stresses are very small, max 2 N/mm2, while the Von Mises stress are zero for earthquake load.
Any idea what could be wrong, because I am trying with different model and I still get the same result.
Thank you

 

[PicoStruc]

From my experience, enveloppe force are not working with stress display in SAP2000.

This might be related to stress averaging algorithm... not sure about that !!

And earthquake might be enveloppe (Modal Combinaison are... don't know about time history thus)

Try a static load instead just to test it !

It is really a problem for me too... cannot do enveloppe of static load combination and inspect stress of the enveloppe.

You might try to contact CSI for technical support... let's see their view on that problem !

 

[stressed]

Response spectrum is frequency domain, so it is always linear. That is the nature of a response spectrum analysis. If you want to run nonlinear dynamic analysis run nonlinear time history dynamic analysis.