I was trying to use Hyperbolic Gap and Elastic PP Gap material in my analysis of a bridge abutment. It appears both models are not working with OpenSeesPy. I used both materials few years ago with tcl scripts. I am wondering whether I made any mistake in defining the material models. Below is examples of the material definition. The elastic PP model is however working fine. Any help is greatly appreciated.
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abutTag = 21 abutK = 200000.0 abutRf = 0.85 abutFu = -3730.0 abutGap = -0.01 ops.uniaxialMaterial('HyperbolicGapMaterial', abutTag, abutK, abutK, abutRf, abutFu, abutGap) ops.uniaxialMaterial('ElasticPPGap', abutTag, abutK, abutFu, abutGap)
WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve
DisplacementControl::newStep(void) - failed in solver
StaticAnalysis::analyze() - the Integrator failed at iteration: 0 with domain at load factor 0
OpenSees > analyze failed, returned: -2 error flag