FINITE ELEMENT MODEL VALIDITY CHECK 3.
Unit Gravity Loading in All Three Translational Directions
The Unit Gravity Loading validity check verifies that the model will provide accurate displacements and reactions forces under gravity loading. This is a good check to perform if your model will be used for quasi-static loads analysis.
No large displacements should be found as a result of this validity check. In addition, forces and moments at only the mounting locations should be obtained when SPCFORCES=ALL is used in the CASE CONTROL. The forces should add up to the total weight of the model in the input loading direction and the forces in the other directions should be zero.
EXECUTIVE DECK must include the following information:
CASE CONTROL must include the following information:
SPCFORCES=ALL DISP=ALL SPC=100 (both normal plate rotations and structure held at base) SUBCASE 1 LABEL=UNIT GRAVITY LOADING IN X DIRECTION LOAD=139997 SUBCASE 2 LABEL=UNIT GRAVITY LOADING IN Y DIRECTION LOAD=139998 SUBCASE 3 LABEL=UNIT GRAVITY LOADING IN Z DIRECTION LOAD=139999
BULK DATA must include the following information:
PARAM GRDPNT 0 GRAV 139997 0 386.4 1. 0. 0. GRAV 139998 0 386.4 0. 1. 0. GRAV 139999 0 386.4 0. 0. 1. (386.4 in/sec2, use
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