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Thanks dear frank

I mean multiple analysis and i want to define initial stiffness of columns by elements properties. for example: first story: 2k and second story: k.
in linear analysis we can use elastic beam column element. what about nonlinear analysis?

Hi dear all,

I want to assign different stiffness to columns (k, 2k, 3k, …) in pushover analysis. Is there any ‎nonlinear element which define k (or I)? ‎
Or
I have to change columns stiffness by changing their sections?‎

Thanks dear fbeckwit

The problem is that: I could not increase base shear by a special amount at each step in displacement control analysis.
Any solution?

but it is necessary to use LoadControl. as I said i have to increase total base shear by 100 at each step.
Is there any way to fix convergence problem in LoadControl pushover Analysis?

Thanks dear fmk i reached my goal by using: set totalbaseshear 600000 set baseshearincrement 100 set Nsteps [expr int($totalbaseshear/$baseshearincrement)] integrator LoadControl $baseshearincrement set ok [analyze $Nsteps] what should I do when Convergence Test failed in LoadControl pushover analys...

Integrator LoadControl x What is x? does it apply to base shear? I want to increase base shear in amount of 100 N at each step, till base shear reach 600000 N in pushover analysis. How can I do it? Is the following correct? Integrator LoadControl 0.000167 #100/600000=0.000167 … Analyze 6000 I have a...

Hi Here is a part of the warning message about convergence problems that I have due to time history analysis: OpenSees > analyze failed, returned: -3 error flag WARNING: CTestEnergyIncr::test() - failed to converge after: 1000 iterations NewtonLineSearch::solveCurrentStep() -the ConvergenceTest obje...

I do not understand what you mean. Factor=i/20, so it will be different for each i and leads to different results.

Hi,
Is there any image for Bilinear.cpp material which is defined on following page?
http://opensees.berkeley.edu/OpenSees/a ... ource.html

i want to run model and save record for each factor indpendently. i.e. for first factor in time history analysis ( in my code : 0.05) run model and record node43 Disp at whole time. and after change factor (second factor in mine code: 0.1) and record node43 Disp for this factor. while roofDisp for f...

Thanks dear fmk
Is there any command to reset node recorder too for each i in for loop?
although i use set roofDisp 0.0, roofDisp for each factor at time 0 start with roofDisp value of pervious factor at tFinal.

in for loop, after first Factor, time does not reset and continue over the tFinal. how can i solve it?

you mean i should use while loop? what do you mean by: i have seen cases where there are 20 if {} blocks within the while loop!? and another problem: in UniformExcitation Pattern, when i change factor ( or ground motion records), the result of analysis e.g. displacement, does not change. what is the...

in the following i use while too. but when roof displacement hits 0.5 m; the analysis do not break and continue, and after it gets error: the ConvergenceTest object failed in test. Do I use while and for in correct place? wipeAnalysis loadConst -time 0.0 set kk 1 for { set i 1} { $i <=100 } { incr i...

i use if instead of while. It is not correct?