The OpenSees Community

dear all, I'm a little bit confused with the orientation vectors. I have two columns. Local x axis of the columns coincide with global y axis. Between the two columns i have a zerolengthsection element (fiber section) I want the local x axis of the zerolengthsection to coincide with the global y axi...

thank you for your reply,

I have used the remove loadPattern command but the initial force remains nonzero...
I have also used the wipeAnalysis command with the same results...

Dear all, Is there any way I can set time and forces to zero after a static reverse analysis? I model a four storey one bay frame. First I aply a static reverse analysis up to yielding and then I want to keep the current state of stiffnes and perform a dynamic nonlinear analysis. The problem is that...

Dear Olympia,

You can use the MinMax Material

Please, can anyone help me?

Dear fmk, I have a few questions about fiber section stress strain recorder. - Is there any way i can record the stress strain responce of all fibers of my section that have the same y or z coordinate? - I can ask to record the stress strain of a fiber by providing the coordinates of the fiber or by...

Dear all,

I want to combine two materials in series one Hysteretic and one Steel02 but only in tension. Is there any way i can do this?

Thank you.

Dear all, I'm trying to do a simple gravity (static) analysis of an RC 1 bay 1 floor frame. For the column and beam i use fiber section and dispBeamColumn elements (4 elements for the column and 21 elements for the beam). I use the eleLoad command for the gravity loads. The analysis fails with the a...

Dear all i'm trying to analyze a 2D truss with 240 nodes and 711 elements. the material i use are concrete07 and steel02 for the truss elements. when i'm trying to do a simple static analysis an error occurs: WARNING BandSPDLinLapackSolver::solve() - the LAPACK routines returned 416 WARNING NewtonRa...

fmk, thank you very much for your help...

Dear All, I'm modelling a 2D RC frame with 4 floors and 3 Bays. I'm usign fiber section to model the columns and the beams. I want to assign a rigid diaphragm at floor level and since the rigidDiaphragm command is valid only for 3D problems i use the equalDof command. equalDOF 5 6 1 equalDOF 5 7 1 e...

yfeng
thank you very much for your help.

I have manage to run the analysis. I had an extra blank line before the closing parenthensis of command section Fiber. When i delete this line i had no problems.

Silvia thank you very much for your help.

Yes it works with elastic section and i does not with nonlinearBC. I'll try the moment -curvature as you suggest and see what happens.

Thank you very much for your help. I'll let you know what is happening...

I have tried this and it works just fine. When I use the nonlinearBeamColumn element I have the problems. Do you think it could be something wrong with my fiber section??

it crashes after geometric transformation. the command is:


element nonlinearBeamColumn 1 1 2 5 200 1

Thank you again.