Define local mode

[TienDat.NGUYEN.Engineer]

I have some issues, when I run the modal result, the first modal case is the local one which very small mass participant and not correct if we use the result for the analysis modal.

May be it comes from some cantilever or line element, we must remove and replace by load in stead.

But my question is how can we find this element in our modal ? Thanks in advance.

[Krzysztof_Wasik]

Hi @TienDat.NGUYEN.Engineer 

You can check normal mode shape by activating deformation display for selected mode in Results >Diagrams for members.