The OpenSees Community

Dear Silvia,

I couldn't find a systematic error at all; the difference in both software is random. It is kind of strange that such a simple code which seems logically correct is causing this difference in results.

Thanx for your prompt response.

Kumar, M.

Hi there! I have performed the elastic time history of 124 ground motions using this code; the results are seriously contrasting to Seismosignal (another software). I am very sure results of Seismosignal are right. But, I cannot find any mistake whatsoever in this code (except for the damping) but c...

Dear Silvia, Thanks for your reply. I needed it becoz, I am performing NTHA on same structure with Opensees and another software. I am getting same top displacement and different base shear with two software. If I calculate effective modal masses manually and multiply with relative mode acceleration...

Hi Silvia,

Is there a command in Opensees to find out Effective modal masses for each mode of vibration?

Look forward to hearing from you.

Regards,

Kumar,M.

I am thankful to you for the response and confirmation of convergence problems if more than one elements are used.

Kumar, M.

Dear Silvia, First of all thanks for prompt response as always. :D It does not make too much sense to me :roll: ; because when I use single forced based element per member the nonlinear time history works for ductilities as large as 6-8 for the given frame; and the frame also works with 4 displaceme...

Hi Silvia, I am performing nonlinear time history analysis of 5 storey steel frame, to different level of intensities (IDA). I developed the model initially using displacement based elements and works perfect as I compared the results with Seismostruct. When I changed the elements to Nonlinear beam ...

Hi Everybody, I am looking for a recoder that provides me maximum (+ve, -ve, or abs) drifts for the nonlinear time history. Just like envelope node recorder that gives maximum displacements. I need such option to scale the ground motions to produce a certain level of drift at any storey of the struc...

Dear Silvia,

Thanx for you urgent and informative reply

Kind regards,

Kumar, M.

hELLO eVERYbODY, I was wondering :roll:, if it is possible to record time period(s) (1st mode, 2nd mode) during the non linear time history analysis of structure. I would love :mrgreen: to know how the time period of my structure changes due to yielding at various location :wink: Take Carez, Kumar, M.

Dear Silivia,

Thankz for the reply, I will try that.

Kumar, M

Dear silivia, First of all thanks for the prompt reply. I have one more question though, normally the output we get from recorder is stored in a file. Is it possible to store the recorder output in a variable or array so that I can use the output further to program. Actually I am trying to develop s...

Dear Frndz,

Is there any recorder available, that provides maximum displacement during the time history analysis at any given node.

Cheers

Dear frndz,

Does any of you know how to perform adaptive push over and Incremental Dynamic analysis using OpenSees.

Looking forward to your answer.

Cheers!!!!!!!!!