opensees

[Qingtian9426]

Dear colleagues, when encountering eigenvalue problems during the gravity analysis of a cable-stayed bridge in OpenSees, how should we proceed with checking the issue, given that the constraints appear to be without issues. FullGenEigenSolver::solve()the eigenvalue 1 is numerically undetermined or infinite FullGenEigenSolver::solve()-the eigenvalue 2 is numerically undetermined or infiniteinfinite FullGenEigenSolver::solve()the eigenvalue:3 is numerically undetermined or infiniteinfinite FullGenEigensolver::solve()the eigenvalue 4 is numerically undetermined or infinite FullGenEigenSolver::solve()the eigenvalue 5 is numerically undetermined or infinite. FullGenEigenSolver::solve()theeigenvalue6 is numerically undetermined or infinite. FullGenEigenSolver::solve()-the eigenvalue 7 is numerically undetermined or infinite FullGenEigenSolver::solve()the eigenvalue:8 is numerically undetermined or infinite FullGenEigenSolver::solve()- the eigenvalue 9 is numericallyundetermined or infinite FullGenEigenSolver::solve()the eigenvalue:10 is numerically undetermined or infinite FullGenEigenSolver::solve()the eigenvalue11 is numerically undetermined or infinite FullGenEigensolver::solve()-the eigenvalue 12 isnumerically undetermined or infinite

[mhscott]

You probably need to move the nodes around slightly https://portwooddigital.com/2021/11/22/cable-analysis/ Or, you can fix the rotational DOFs of the cable nodes.