analysis error

[senior]

I am analyzing my model (it is time history analsis),are these 2 series errors or they are just announcements?


1)
WARNING: CTestEnergyIncr::test() - failed to converge but goin on - current Ener
gyIncr: 2.80319e+006 (max: 0.001)
Norm deltaX: 0.427589, Norm deltaR: 5.58163e+007
WARNING: CTestEnergyIncr::test() - failed to converge but goin on - current Ener
gyIncr: 2.43794e+006 (max: 0.001)
Norm deltaX: 0.350589, Norm deltaR: 5.205e+007

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2)warning: CTestEnergyIncr ::tesr<> failed to converge
after 800 iteration
modifiednewton::solveCurrentStep<> - the convergenceTest object faied in test<>
directIntegrationAnalysis::analyze<> - the alqorithm failed at time 13.62
opensees > analyze failed returned: -3 error of flag
trying Newton with Initial Tangent ...

[mhscott]

Yes! They are serious as you are carrying large residual equilibrium errors (norm deltaR) in to subsequent time steps.

[fmk]

you might want to change the convergence test so that it does not go on after a failure and try some other iterative strategy.