Hi dear fmk

[setareh20]

Hi,
I want to do Gravity Analysis and the arrangement for Gravity Analysis in my model are:

constraints Penalty 10e16 10e16;
numberer RCM;
system BandGeneral;
test EnergyIncr 1.0e-5 600;
algorithm Newton;
set NstepGravity 10;
set DGravity [expr 1./$NstepGravity];
integrator LoadControl $DGravity;
analysis Static;
analyze $NstepGravity;


But I faced with the following error:

WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 1
WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 0.1
OpenSees > analyze failed, returned: -3 error flag

After that, I used the different system types and different algorithm types for example SparseGEN, Umfpack and ModifiedNewton and ….. But for each of them Opensees gave me that error. Please guide me how can I eliminate the above error.
Thank you so much

[vesna]

This warning message indicates the problem with the model rather than with the analysis. Check your constraints and make sure that you do not have any "hanging" nodes.