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dear brag006 thanks for your attention.I did so. I have 3 steel frame models 5,7 & 9story. for 5story model, resposes are periodic though have slight amplitude. but for 7 & 9story I came across this error: "opensees stop working". for 5story model when I chenged geomTransf from Cor...

hi dear all I'm modeling progressive collapse due to vertical member removal in 2D steel frames. I introduce sections, materials, equalDOFs & elements of the frame then I apply the vertical loads (DL+0.25LL: increasing linearly in 5 seconds & remain constant 2 seconds to avoid dynamic effect...