below , you see my opensees code.its a 15-story 2d building.its a steel structure but has shear wall in middle span.( i have modeled it with frame and a nonlinear hinge in bottom floor).
my structure has two outriggers in middle.
the problem is I can not calculate eigen values and analyze it. i don't know what the errors mean. pls help me and tell me how to fix it.
eigen and analysis problem
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eigen and analysis problem
Last edited by senior on Thu Nov 07, 2013 12:16 pm, edited 1 time in total.
Re: eigen and analysis problem
Your getting a singular stiffness matrix which means you are most likely missing some constraints. But your code is too long and complicated so don't think anyone would be bothered to check it for you. Best if you start small and work your way up. Maybe start with everything linear, just a basic linear frame with no shear wall or anything. If that works then make your model more complicated. Until you get to the end.