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[Aurojyoti Prusty]

Hi,

Generally we get some values zero, when the dofs in that position does not have any effect on the other dof. For example, in this case, (2,1) is 0. It means there is no effect of dof=2 on dof=1. I think you have extracted this from the global mass matrix which is coming from number of beam elements. Do you mind to share, how did you get the numerical values of mass matrix ? How does your model look like?

Thanks

Aurojyoti.