Discrepancy of results between SAP2000 and OpenSees

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katterineac
Posts: 6
Joined: Sat Feb 08, 2020 1:15 pm

Discrepancy of results between SAP2000 and OpenSees

Post by katterineac » Tue Nov 24, 2020 11:16 am

I am modeling a composite behavior of a slab and a girder. The shear diagram of the beam, according to OpenSees is 50% of the shear diagram obtained in SAP2000. But the bending moment diagram is the same for OpenSees and SAP2000 results. Why is this happening?

selimgunay
Posts: 889
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: Discrepancy of results between SAP2000 and OpenSees

Post by selimgunay » Tue Nov 24, 2020 12:02 pm

Do you have the same distributed load in both cases?

katterineac
Posts: 6
Joined: Sat Feb 08, 2020 1:15 pm

Re: Discrepancy of results between SAP2000 and OpenSees

Post by katterineac » Tue Nov 24, 2020 12:17 pm

Yes, because all internal forces are the same, except the shear diagram (reactions, axial, etc forces are the same)

selimgunay
Posts: 889
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: Discrepancy of results between SAP2000 and OpenSees

Post by selimgunay » Tue Nov 24, 2020 4:09 pm

Actually, there is no shear diagram functionality in OpenSees. If all of your member end forces and the distributed loads are the same, it means you get the same results from the two software.

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