Seismosoft | Earthquake Engineering Solutions

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

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.