convergence of analysis

[schoolstru]

i conducted IDA analysis for my model
and this message is printed
i want to know that does it show that the analysis converge successfully?
in other word when analysis get completed it always means that it converged or not?
"
OpenSees -- Open System For Earthquake Engineering Simulation
Pacific Earthquake Engineering Research Center
Version 2.5.0 (rev 6248) 64-Bit

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Modified Ibarra-Medina-Krawinkler Model with Peak-Oriented Hysteretic Response
Nodes defined.
Beam elements defined.
Column elements defined.
Beam plastic hinges defined.
Column plastic hinges defined.
WARNING: CTestNormDispIncr::test() - failed to converge
after: 400 iterations current Norm: 8.76775e+019 (max: 1e-006, Norm deltaR: 1.19899e+016)
NewtnRaphson::solveCurrentStep() -the ConvergenceTest object failed in test()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 0.1
OpenSees > analyze failed, returned: -3 error flag
Model built & gravity analysis completed.
T1 = 1.4803945889458143 s
T2 = 0.5601300254213768 s
T3 = 0.2841318320034405 s
EQ_name:IMPVALL/H-E11140
GM parameters and acceleration series defined.
Ground Motion Done.
The current time is: 39.040000
"
thanks for your reply

[fmk]

What do you think with that error message?? .. though it did work up until that point, assuming your convergence tolerance is not messed up.

[TPdct]

It's definitely a failure.
"after: 400 iterations current Norm: 8.76775e+019 (max: 1e-006, Norm deltaR: 1.19899e+016) "
For IDA analysis, you'd better write some code to allow changing a shorter analysis step when convergence failure occurs. If you set your analysis step a fixed value, it's difficult to converge when the seismic wave is large

[TPdct]

Also, I advise you to use OpenSeesMP with Mumps solver to make computation fast enough

[schoolstru]

TPdct wrote:
> Also, I advise you to use OpenSeesMP with Mumps solver to make computation
> fast enough
Thanks for your reply;
this error was due to modeling;
and it removed when i examined and correct the model;
i would like to thank you for your reply; it would be useful for me.

[ahmadbsr]

TPdct wrote:
> Also, I advise you to use OpenSeesMP with Mumps solver to make computation
> fast enough
Thanks for your reply;
this error was due to modeling;
and it removed when i examined and correct the model;
i would like to thank you for your reply; it would be useful for me.

How did you fix your problem? because I have same problem

[ambaker]

The return code from the analyze command can be used in the IDA to designate failed runs. Often it is done in this way:
set ok [analyze 1]
Then, at the end of the analysis, you can write the return code to a file:
set fid [open code.out w]
puts $fid $ok
close $fid