Hi Dr. Khemka,

Thank you really much for your answer. Maybe you are able to help me with this related topic as well.

I use *[GET, EF_X, MODE, counter, EFFM, , DIREC, X] to get EFFM for each modal shape. However, some of them give me EFFM=0. Is it normal for an [MODOPT, UNSYM, 20, 0.01, 1,,, BOTH] analysis? Never happen to me for any traditional (symmetric) modal analysis. Also, if I do not use [BOTH] I get a sum of EFFM that is much larger than the total mass of the model.

Thank you, Pierluigi