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suggest u read some fem book on large strain , large deformation in collapse scenarios is beyond traditional p-delta effect.

set IDloadTag {1,2}; set iGMfile {"GMX1.txt","GMX2.txt"}; set iGMdirection {1,2}; set iGMfact {10,10}; set dt 0.02; foreach GMdirection $iGMdirection GMfile $iGMfile GMfact $iGMfact { set GMfatt [expr 1*$iGMfact]; set AccelSeries "Series -dt $dt -filePath $iGMfile -factor $G...

maybe you can just try both~ however, parameters are more important for these two materials~

:shock: thank you for your uesful tips, Frank~ I'll follow your proposed procedure step by step~ ________________________________________________________________________ fmk wrote: > the constraints you added, for example equalDOF 16 23 1 2, had to be there > if you look at the model you created! yo...

:D Thank you for your reply, Professor Michael H. Scott~ Actually, I had tried to constrain more nodal freedoms before. belowing change has been made "equalDOF 1 2 1 equalDOF 31 32 1 equalDOF 16 23 2 equalDOF 20 53 2 equalDOF 50 57 2 equalDOF 46 27 2"=====> "equalDOF 1 2 1 2 equalDOF ...

This is a planar one-bay two-story post-tensioned RC frame model. Zerolengthsection element is used to model the non-tensile compression only behavior of beam-column interface and column-base interface. I have checked the model many times, I think there is no errors concerning about model geometry. ...