#342 Gravity loading in Nastran (GRAV card)

Mar 9, 2023 | nastran

Inertia loading: 1G GRAV load (down)

Description: Used to define gravity vectors to determine gravity loading for the structural model.

$2345678$2345678$2345678$2345678$2345678$2345678$2345678$2345678
$1111111$0222222$3333333$4444444$5555555$6666666$7777777$8888888
$GRAV   SID     CID     G       N1      N2      N3   
GRAV    200     0       386.4   0.0     0.0     1.0

SID = load id.
CID = coordinate system id. A CID=0 references the basic coordinate system. If CID=-1, the gravity vector components are in the local displacement coordinate system of the grid points.
G = gravity vector scale factor.
N1, N2, N3 = gravity vector components measured in coordinate system defined by CID.