*HEADING Increase tensile load on the piping system and determine lowest frequency. *RESTART, READ ** ** Step 3 - General step ** *STEP, NLGEOM, INC=20 Apply 8MN axial tensile load *STATIC 0.1, 1. *CLOAD RIGHT, 1, 8.0E6 *RESTART, WRITE, FREQUENCY=10 *OUTPUT, FIELD, FREQUENCY=10, VARIABLE=PRESELECT *OUTPUT, HISTORY *ELEMENT OUTPUT, ELSET=ELEMENT25 S, SINV *NODE PRINT, FREQUENCY=0 *EL PRINT, FREQUENCY=0 ********************************** ** OUTPUT FOR ABAQUS QA PURPOSES ********************************** *END STEP ** ** Step 4 - Linear perturbation step ** *STEP, PERTURBATION, NLGEOM Extract modes and frequencies *FREQUENCY, EIGENSOLVER=SUBSPACE 7, *RESTART, WRITE *OUTPUT, FIELD, VARIABLE=PRESELECT *NODE PRINT, FREQUENCY=0 *EL PRINT, FREQUENCY=0 ********************************** ** OUTPUT FOR ABAQUS QA PURPOSES ********************************** *MODAL FILE *END STEP