Eigenvalues

[Fameh]

Hello everyone,
I am modeling a plate girder bridge with concrete pier wall using elastic elements for girders, beam and stringers and ShellMITC4 for the deck and the pier.
The eigenvalues analysis resulted in negative values and values close to zero.
Can someone please help solve this issue?
Thanks

[fmk]

i suggest that you break the problem down to find the problem.

first try making all the material elastic. if that fails, fix all the nodes but one and check, and then continue releasing them a few at a time until you find your error.