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Civil Engineering/etabs sap 2000 torsion


hello sir,
         my question is as we know for a asymmetrical structure torsion is developed..if im doing dynamic seismic analysis for a l shaped building which is asymmterical...where can i find the base torsion of the the etabs and sap 2000...its giving a list in the tables for base moment-x base moment-y and base moment-z which of the above is the torsion of the structure...
secondly is the torsion only developed due to lateral forces not due to gravity loads?

Dear Nadir

1- No base torsion is reported in sap and etabs, but a base moment Mx, My and Mz is calculated and you should consider Mz az base torsion. I added this by a note I recieved from Shoeib.
2- Torsion may be developped in any mode of loading including gravity loads.


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Babak Esmailzadeh Hakimi


I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!


I am experienced in the area of earthquake engineering in electrical power industry, i.e. Lifeline Earthquake Engineering. My focus has been on structural seismic design of power installations. Recently I have got involved in project management in the category of constructional engineering.

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Bs degree in Civil Engineering from Ferdowsi University ,1988, Mashhad Iran, Ms degree in Earthquake Engineering, Sharif University of Technology, 1993, Tehran, Iran

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