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  1. Catherine S

    Etabs 'STURM-SEQUENCE CHECK FOUND 2 EIGENVALUE(S) BELOW THE SHIFT'

    My model cannot run the modal-ritz load case, the waring massage shows THE STURM-SEQUENCE CHECK FOUND 2 EIGENVALUE(S) BELOW THE SHIFT, RITZ ANALYSIS REQUIRES ALL EIGENVALUES TO BE ABOVE THE SHIFT and NO RITZ MODE WERE FOUND Do anyone know what causes this warning and how to solve it?

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