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Hello, I have stiffness [K], mass [M] and damping [C] matrix in matlab (and could be exported into text files) and I need that opensees uses these Matrixes (or files) as it's input (instead of modeling the geometry and derive these matrixs from that) and performs modal analysis or time history analy...

PrintA does not work after analyze command in a static analysis. ( system FullGeneral is used).
No file be created.
Any suggestions or same experience?

Hi,
How can I change the stiffness and damping of a 2node link element during analysis and repeat the analysis? because I can not overwrite the material.

Thank you.

Hi Jeena,

if all the conditions in your runs are the same and you got two different results, it seems that in second run, your model had some initial variable's values from the first run.
use wipe command before second run or reload opensees.
I hope it works.

regards,
Hamid.

fmk wrote: > it is .. look at GenericClient element is SRC/element/generic .. you might > need to modify a bit based on the data you are sending/receiving from your > otehr application. Dear Francis, I think your suggestion differs to what I need because it is about changing the elements specificati...

How to obtain the modal participated masses in opensees?

When I run this commands, the output is zero! set NstepGravity 10; set DGravity [expr 1/$NstepGravity]; puts $DGravity; to correct this (after an hour try and error!!!), I used 1. instead of 1, and the problem solved: set NstepGravity 10; set DGravity [expr 1./$NstepGravity]; puts $DGravity; Why!?? ...

Hi, I am working on the active mass dampers and I shall model a building with active mass damper in OpenSees. Please let me know your idea about any references, books, journals, examples which could help me about modeling these devices and the corresponding equations of motion. Especially please let...

Is it possible to use stiffness, mass, damping matrix from another program to import them into opensees and then analyze such structure Under a Time history loading matrix P?