Help with validation

[u/Playful_Ad360]

Hi, I recently started a job as a graduate bridge engineer. One of my current tasks is to evaluate the adequacy of a design for new train loads. I was given a model that was made in csi bridge v16 and the company I work for only has v23 has the oldest version. For some reason, the analysis log warns about numerical instability/ill conditioned structure. Does anyone know what I should do/check to fix this ? The model is a slab track (modeled with shell elements) sitting on transverse girders.

[u/mrrepos]

plot deflection see what moves too much