Eigenvalue analysis giving Zero values + nodal displacment

[WillP]

Hi,

Two models set up in the exact way, with the exception of one being a bare RC frame whilst the other includes infill.

The infill wall gives values of 0 of nodal displacement in the x direction whilst carrying out Eigenvalue analysis for the fundamental mode.

Any clarification in relation to this issue would be greatly appreciated.

Cheers

[huffte]

Without more details, it is only possible to offer up a conjecture. Is it possible that, with the in fills added, the fundamental mode is now entirely a y - direction displacement of the structure? Best of luck.