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the error is:
ArpackSolver : Maximum number of iterations reached

nobody can help?

when I change direction in the uniform excitation command to 2 it isn't any problem either
the structures moves in the vertical direction and outputs are not zero

(my omdel is 2D)

I am modeling a steel moment frame plastic hinges (zerolength elements) are considered at the ends of beams and columns but in a small distance from connection. this small distance (about 0.2m) is considered rigid (elasticbeamcolumn with big E) and between plastic hinges is considered elastic. i don...

thanks Mr Amini for ur attention, my problem is solved .

last time automatically, it worked well after a day, (I didn't do anything to fix the problem.)
now I have this problem again, and don't know what should be done.. :} what's the reason?

no it doesn't have a softening branch, just its slope decreases

Is there any problem with my code?

yes I have multiplied records into 9806 ( g in mm/s^2) (my units are N,mm) This is my code for performing IDA: set rec 19; set SS 0.005; for {set step 1} {$step <= 12} {incr step 1} { source Modeling.tcl; source ReadSMDfile.tcl; source ReadSMDfileNPTS.tcl; source LibAnalysisDynamicParameters.tcl; ##...

Hello everybody!

my ida curve is linear while the pushover curve becomes nonlinear?
when I increase Sa(T1) it does converge and goes up. even for Sa=7!!
does anyone know what might be the problem?

when I run my codes, they don't record outputs anymore!! codes haven't changed. they are the same as the past, when they recorded properly. Does anyone know what might be the problem? I copied my files into another drive, but nothing changed. It doesn't say any warning nor errors, but doesn't record...

hello everybody!
Can Opensees be installed in Mac or just in Windows?

I have heard that if the frame is peripheral then leaning columns should be considered. is this true? why?

Hi everybody! when it's necessary to consider P-delta effects by using a leaning column? if the frame is a 2d peripheral frame withdrawn from a 3d structure, is it necessary to define leaning columns? Does "Being a peripheral or middle frame" make any difference for considering or not cons...

Thank you very much for answering Mr mhscott
I wrote "urgent" because I have a little time for my thesis.

what do you mean? how I should understand by a smaller model if the rigidity is enough?

I am modeling a dual system (SMRF with RC shear wall) in Opensees - (10 story) i have question about modeling wall if i want to model it by fiber method, i have used a nonlinearBeamColumn element in the center of wall and the fiber wall section is assigned to. and rigid beams in both sides of wall c...