2D truss modeling problem in opensees, the LinearSysOfEqn failed in solve?

05 May 2016 3 10K Report

Hi, I tried to model this benchmark truss in OpenSees but it failed in solving Linear system of equations, would you mind helping me to solve this issue?

schematic of the benchmark truss is attached.

Error that it returned:

Error: WARNING BandSPDLinLapackSolver::solve() - the LAPACK routines returned 1

WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()

StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 1

OpenSees > analyze failed, returned: -3 error flag

-3

Code:

model BasicBuilder -ndm 2 -ndf 2

node 1 0.0000 0.0000

node 2 360.0000 0.0000

node 3 720.0000 0.0000

node 4 0.0000 360.0000

node 5 360.0000 360.0000

node 6 720.0000 360.0000

fix 1 1 1

fix 4 1 1

uniaxialMaterial Elastic 1 10000

element Truss 1 1 2 5.219 1

element Truss 2 1 5 20.310 1

element Truss 3 1 3 14.593 1

element Truss 4 2 4 7.772 1

element Truss 5 4 5 28.187 1

element Truss 6 3 5 20.650 1

timeSeries Linear 1

pattern Plain 1 1 {

load 2 0 -100

load 3 0 -100

}

system BandSPD

numberer RCM

constraints Plain

integrator LoadControl 1.0

algorithm Linear

analysis Static

recorder Node -file NodeDispX.out -time -node -dof 1 disp

recorder Node -file NodeDispY.out -time -node -dof 2 disp

recorder Element -file AxialForces.out -time -eleRange 1 6 basicForces

analyze 1

wipe

P.S. the attached figure is extracted from "Richardson, J. N., Adriaenssens, S., Bouillard, P., & Coelho, R. F. (2012). Multiobjective topology optimization of truss structures with kinematic stability repair. Structural and multidisciplinary optimization, 46(4), 513-532."

Olof Dahlberg

Try

model basic -ndm 2 -ndf 3

Best regards,

Olof

Hirad Assimi

Thanks for your reply, I tried it but it returned error, this is as same as the previous error but -LAPACK routine returned 3 instead of 1. and I don't have a clue about it.

Any reply would be appreciated.

WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 3

WARNING Linear::solveCurrentStep() -the LinearSOE failed in solve()

Thank you so much dear Mohammad Mahdi.

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