how can i fix the WARNING?

[kitefall]

hello everyone!
the case i did is about the modes of pre-stressed concrete beam, but i got the WARNING!:
"WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 17
WARNING AcceleratedNewton::solveCurrentStep() -the LinearSysOfEqn failed in solve()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 0.0001
OpenSees > analyze failed, returned: -3 error flag."

i think it is maybe wrong about analysis option. who can tell me ,what's wrong with it?
thanks in advance!

[kitefall]

i post the command of analysis option .

#analysisoptn "gravity":type static
constraints Plain
test NormDispIncr 1e-8 25 0 6
integrator LoadControl 0.01
algorithm Newton
nuberer RCM
system BandGeneral
analysis Static
analyze 100

loadConst -time 0.
record
wipeAnalysis
#analysisPton "engen":type eigen
constraints Transformation
test EnergyIncr 1e-6 25 0 2
integrator Newmark 0.5 0.25
algorithm KrylovNewton
numberer Plain
system Bandgeneral
analysis Transient
analyze 100 0.01

please share your views about the WARNing with me! And where can i get the detailed explanation for analysis option or the interrelated examples?
thans a lot!

[Kamesh9]

In which analysis do you get the error ?.... i mean in static or transient ?

[kitefall]

hello,Kamesh9. i use the "puts" command to output a mark , in whic i find the error i got at the begining of analysis .
however,If it is in the elastic analysis, but also be able to explain what? or else?

[Kamesh9]

So I assume that the error is in static/gravity analysis. I got similar errors when I had rigid body motion in the model, if you are sure that you do not have any rigid body motion in the model, try changing the algorithm to Newton line search.

[kitefall]

hi, Kamesh. thank you very mush for you concren.
i had a element that is ridid body motion in my model. do you think it is the problem? and how did you deal with it ?
If convenient, I hope we can communication with e-mail. My e-mail ID:kitefeifei@gmail.com.

[rezarahimi]

hi kitefall
i think it is better to try systemTypeStatic UmfPack which gives more accurate answers for large models


SYSTEM (http://opensees.berkeley.edu/OpenSees/m ... al/371.htm)
Linear Equation Solvers (how to store and solve the system of equations in the analysis)
-- provide the solution of the linear system of equations Ku = P. Each solver is tailored to a specific matrix topology.
ProfileSPD -- Direct profile solver for symmetric positive definite matrices
BandGeneral -- Direct solver for banded unsymmetric matrices
BandSPD -- Direct solver for banded symmetric positive definite matrices
SparseGeneral -- Direct solver for unsymmetric sparse matrices
SparseSPD -- Direct solver for symmetric sparse matrices
UmfPack -- Direct UmfPack solver for unsymmetric matrices

[kitefall]

rezarahimi wrote:
> hi kitefall
> i think it is better to try systemTypeStatic UmfPack which gives more
> accurate answers for large models
>
>
> SYSTEM (http://opensees.berkeley.edu/OpenSees/m ... al/371.htm)
> Linear Equation Solvers (how to store and solve the system of equations
> in the analysis)
> -- provide the solution of the linear system of equations Ku = P. Each
> solver is tailored to a specific matrix topology.
> ProfileSPD -- Direct profile solver for symmetric positive
> definite matrices
> BandGeneral -- Direct solver for banded unsymmetric matrices
> BandSPD -- Direct solver for banded symmetric positive definite
> matrices
> SparseGeneral -- Direct solver for unsymmetric sparse matrices
> SparseSPD -- Direct solver for symmetric sparse matrices
> UmfPack -- Direct UmfPack solver for unsymmetric matrices
--------------------------------------------------------------------------------------------
hi,rezarahimi.
thanks for your suggestion. I will try it, and if it is work, i will sent the good results back to you.