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Nonlinear time history analysis and plastic hinges

Nonlinear time history analysis and plastic hinges

Nonlinear time history analysis and plastic hinges

(OP)
Hello,

I have been trying to solve with SAP2000 failure mode of planar steel frame under El Centro 1940 earthquake. Static live load on the frame is 2,5kN/m^2.

My problem is this, that when I run nonlinear analysis, I'm not able to produce any plastic hinges. Even I scale El Centro earthquake with 1000 I still don't manage to produce plastic hinges which is actually little bit strange... My task is to find failure mode of this moment frame and of course I want the hinge to be formed to the beam. I have assigned hinges to columns and beams (relative distance 0 and 1).

I have attached few pictures about my project. I'm really stuck and I don't know anymore what I should do to get this to work. Do you know what I'm doing wrong?

Frame information:
http://files.engineering.com/getfile.aspx?folder=9...

Time History function:
http://files.engineering.com/getfile.aspx?folder=0...

Gravity:
http://files.engineering.com/getfile.aspx?folder=7...

Time History in X-direction:
http://files.engineering.com/getfile.aspx?folder=3...


RE: Nonlinear time history analysis and plastic hinges

Hi,

From your question "I have assigned hinges to columns and beams (relative distance 0 and 1)". Can you give it a try using 0.05 and 0.95 as the location of hinges. Can you upload the model? Did you checked wether the model is Illconditioned?

:)

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