load Control !

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parasismique
Posts: 58
Joined: Tue Dec 13, 2016 7:14 am
Location: University of Tlemcen-Algeria

load Control !

Post by parasismique »

Dear colleagues,

I am running a pushover analysis using load-control integrator. I use the following load control procedure,

set Tol 1.0e-12;
test NormDispIncr $Tol 1000 ;
algorithm Newton
integrator LoadControl 10.0
analysis Static
analyze 10

I usually change the 'integrator LoadControl' increment and 'analyze' number of step and errors runs.

UniaxialMaterial::setTrial() - material failed in setTrialStrain()
ForceBeamColumn2d::update() - section failed in setTrial
Domain::update - domain failed in update
LoadControl::update - model failed to update for new dU
WARNING NewtonRaphson::solveCurrentStep() -the Integrator failed in update()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 10
OpenSees > analyze failed, returned: -3 error flag

I appreciate your help.
selimgunay
Posts: 917
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: load Control !

Post by selimgunay »

It is always better to run pushover with displacement control, otherwise your run will stop converging after the initial elastic response
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