Convergence problem in ConfinedConcrete01 Material

ismailqeshta · Post by **ismailqeshta** » Sun Oct 22, 2017 10:57 pm

Hi,
I am facing a convergence problem in the ConfinedConcrete01 Material for my concrete mofdel. The command code that I am using is as follows:

uniaxialMaterial ConfinedConcrete01 1 C -32 $Ec -gamma -0.8 -nu 0.2 1066.8 7.01 82.55 500 180000 0.01 1 32.258

The model keeps running showing the following message:

WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 401(dW: << -1.11493e+009, dW0: -3.11761e+009)
Domain::update - domain failed in update
DisplacementControl::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 1.16053e+006
OpenSees > analyze failed, returned: -3 error flag
Done.

Can anyone please check the code and let me know if there any problem with it.

The model converges very fast when I use Concrete04 Material -- Popovics Concrete Material.

Thank you.