failure!!

[kadirtopcu]

WARNING: CTestNormDispIncr::test() - failed to converge
after: 25 iterations
ModifiedNewton::solveCurrentStep() -the ConvergenceTest object failed in test()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 1
OpenSees > analyze failed, returned: -3 error flag

what could be the reason of this warning? please help, thanks.

[mhscott]

ModifiedNewton usually takes many more than 25 iterations to converge

[kadirtopcu]

thanks for answer Mr. Michael but I have also tried 100 but it is not working. how many steps do you offer to try? Also my model includes fiber sections. could it be the problem? if it is, what can I do to solve it?

[mhscott]

Output the norms using print flag 1 on your convergence test to see if your analysis is converging. If the norms are reducing, allow more iterations. If not, check your model for the reason why there is non-convergence.