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  1. Ritz Analysis Problem

    Dear Engineers; I had a headache from this problem : I run analysis in Etabs for a G+4 Project using Ritz so it runs okay. But I wished to convert some columns to shell elements instead of frame elements then I run the etabs but the response spectrum analysis could not start. when I look into "Last analysis Log..." I found the following : " The strum sequence check found 5 eigen values below the shift Ritz analysis requires All eigen values to be above the shift " Regards
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