solver sequence?

Hi there,
I have question about solver sequencing.
In the structural mechanics module, I have a structure under some static forces. These forces generate some displacements in the structure but then i want to solve an eigen value or frequency responce sweep analysis to see how this deformations caused by the static force change the resonance frequency of the structure. so basically what I want to do is to store the deformation of the structure in the first satatic analysis and then run a second analysis which is an eigen value or frequency response on the deformed structure. storing the result of the first analysis as a initial value for the second analysis seems to give strange result. Does anyone has an opinion?or another way?
Thanks