*AMPLITUDE, NAME=EQ, INPUT=Northridge.csv
*STEP, NAME=Earthquake, NLGEOM=YES, INC=10000 *DYNAMIC, HHT-ALPHA=-0.05 0.01, 30.0, 1e-7, 0.01 *BOUNDARY, TYPE=ACCELERATION, LOAD CASE=1 BASE_NODE, 1, 1, 9.81 *AMPLITUDE, NAME=ACC_X, INPUT=eq_x.txt *DAMPING, ALPHA=0.12, BETA=0.002 *END STEP abaqus earthquake analysis
Do apply acceleration as a body force to the whole model (this gives erroneous rocking). Instead: *AMPLITUDE, NAME=EQ, INPUT=Northridge
This is the most conceptually difficult part for new users. How do you "shake" the ground in Abaqus? LOAD CASE=1 BASE_NODE