analyze failed

Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe

Moderators: silvia, selimgunay, Moderators

Post Reply
michvout
Posts: 1
Joined: Sat May 29, 2021 1:21 am

analyze failed

Post by michvout » Sat May 29, 2021 1:26 am

Hello,

I am student of the Civil Engineering department of Aristotle University of Theassaloniki.

I tried to run the analysis of the file THEMA_QUAKE.txt and i got the following reports.

Could you please give me some advice?

Thank you in advance!

Michail Voutsis


OpenSees > source THEMA_QUAKE.txt
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 0.01
OpenSees > analyze failed, returned: -3 error flag
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 1
0.00015037593984962403 0.00015037593984962405 0.00015037593984962405 0.00015037593984962408 0.00015037593984962408 0.00015037593984962411

Ashok
Posts: 50
Joined: Tue Feb 19, 2019 8:59 pm
Location: IITM

Re: analyze failed

Post by Ashok » Mon Jun 07, 2021 10:25 pm

Lapack errors are because - there is some discontinuity in your model or no proper support i.e. your model is moving as a rigid body

selimgunay
Posts: 913
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: analyze failed

Post by selimgunay » Fri Jun 18, 2021 11:52 am

Can you run an eigenvalue analysis successfully?

Post Reply