Is it possible to perform geometric/material non-linearity in Caesar II considering large displacement where stiffness is changing with displacement and tangent stiffness (Kt) is updating based on incremental loads. Say for HDPE piping where the coefficient of thermal expansion is very high.
Maybe if really needed, a local FEA of the component say elbow, tee, etc. can be performed thru FEA with the applied global loads taken from beam element software.