This example problem involves the following analyses:
A prestressed (PSTRES) modal analysis is conducted on the global model.
Initially, a large-deflection (NLGEOM) static analysis is performed, followed by the prestressed modal analysis (PSOLVE). The Block Lanczos solver (MODOPT) extracts the first fundamental mode.
PSTRESS,ON MODOPT,LANB,1 MXPAND,1, , ,0 PSOLVE,EIGLANB
To examine the effect of the prestressed analysis, a modal analysis without prestress effects is performed on the same model, as follows:
MODOPT,LANB,1 MXPAND,1, , ,0 SOLVE
A nonlinear static analysis is performed on both of the local elbow (ELBOW290 and SHELL281) models.
A constant time increment of 5 ms is specified to obtain the stress and strain response over a period of 20 seconds.
Large-deflection effects are included.
Results are stored (in the RST file) for all substeps.