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Civil Engineering/Pushover analysos

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Question
Hi,
I have a quick question. I am doing a pushover analysis for a cantilevered steel column in Sap2000. After that I am looking at roof displacement versus resultant base shear. I am wondering, is this a right way to obtain ductility of this system? I am asking because if I divide the maximum displacement to yield displacement, I obtain a ductility of 5 which does not make much sense for me.
Thank you,
Manoochehr

Answer
Dear Manouchehr

I dont believe that push over can get a true sense of ductility because you are using an artificial hysteresis behaviour which not seinsitive to the real earthquake shaking.  This is a method to use a displacement method to verify the integrity of the structure under seismic action. However what you have calculated is a general measure of ductility. Why you cant accept it? THis is a measure which can be compared with itself in the same structure and making a somewhat better design.

Regards
BEH

Civil Engineering

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Babak Esmailzadeh Hakimi

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

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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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