Verification with Sap2000

[Geo82]

Hi all and hope ur well,
I am comparing a simple portal frame in sap2000 with the corresponding in OS and I am getting several slight differences in modal analysis.
When I am running in sap2000 a response spectrum analysis with 5% accidental eccentricity and compare with the ASDEA algorithm the results in torsion differ a lot. When I take out the 5% eccentricity from sap2000 results become similar. Is there any chance we could get the algorithm to give the option of including the 5% eccentricity as per code EN1998-1 §4.3.2.

verification.zip

Verification files

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[STKO Team]

Unfortunately the accidental eccentricity is not part of the eigenvalue response of the system. It is instead something that is added in post-processing.
https://wiki.csiamerica.com/display/kb/ ... m+Analysis