I am running the following Gravity analysis with the SANISAND04 costitutive law.
The analysis has the following parameters:
system BandGeneral
numberer RCM
constraints Transformation
integrator LoadControl 0.25
test NormDispIncr 1e-06 100 0
algorithm Newton
analysis Static
updateMaterialStage -material 366 -stage 1
analyze 4
But when I run it I've got the following message:
WARNING: CTestNormDispIncr::test() - failed to converge
after: 100 iterations current Norm: 5.31012e-05 (max: 1e-06, Norm deltaR: 1.16921)
NewtonRaphson::solveCurrentStep() -the ConvergenceTest object failed in test()
StaticAnalysis::analyze() - the Algorithm failed at step: 0 with domain at load factor 0.25
OpenSees > analyze failed, returned: -3 error flag
The model is working cause I've tried to run it before with an Elastic costitutive law and it works!
How can I improve it to make it better?
Any ideas or raccomendations?
For example I did not use any substepping, could be useful?
Thank you very much!