Modal Analysis

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  • #26795

    Hey Everyone,

    I’m a new user of OpenSees Navigator and I am using it to do a research for my Master’s thesis. I already have the model of a high-rise steel building on SAP2000 and I imported the .s2k file to OpenSees Navigator. I checked the model and added the MPconstraints. I am trying to run a modal analysis to check the eigenvalues and modal frequencies and I am getting these warnings (for many nodes but I just pasted some of them):

    WARNING PlainHandler::handle() – constraint matrix not identity, ignoring constraint for node 1
    non-varyng assumed

    and then I get:

    WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 1

    Could anybody help me figure out what the problem is? I’d really appreciate any help,



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