*HEADING
 EARTHQUAKE ANALYSIS (B23) WITH MULTIPLE BASE MOTIONS  
 DIRECT TIME INTEGARTION
*NODE
1 ,300.
21, 
*NSET,NSET=ENDS
1,21
*NSET,NSET=NOUT
1,11,21
*NGEN
 1,21
*ELSET,ELSET=PR
10, 
*ELEMENT,TYPE=B23
1,1,2
*ELGEN,ELSET=EALL
1,20
*MATERIAL,NAME=A1
*ELASTIC
30.E6, 
*DENSITY
 .000728, 
*BEAM SECTION,SECTION=RECT,MATERIAL=A1,ELSET=EALL
1. , 2.
*BOUNDARY
 1, 1,
 1, 6,
21, 1,
21, 6,
** THIS INPUT ASSUMES THAT bmk/multibasemotion_quake.inp 
** HAS BEEN COPIED TO QUAKE01.AMP 
*AMPLITUDE,TIME=TOTAL TIME,VALUE=RELATIVE,INPUT=QUAKE01.AMP,NAME=EQ
*RESTART,WRITE,FREQUENCY=25
*STEP,INC=1000
 EARTHQUAKE INPUT
*DYNAMIC,ALPHA=0.0,DIRECT
.01 , 2.0
**.01 , 5.05
*BOUNDARY,TYPE=ACCELERATION,AMPLITUDE=EQ
 1,  2,2,  386.09
21,  2,2,  386.09
*PRINT,RESIDUAL=NO,FREQUENCY=10
*EL PRINT,ELSET=PR,FREQUENCY=50
S,E
*NODE PRINT,FREQUENCY=10
U,
*NODE FILE,NSET=NOUT
U,V,A
*ENERGY FILE,FREQUENCY=1
*OUTPUT,HIST
*ENERGY OUTPUT,VAR=PRESELECT
*NODE OUTPUT,NSET=NOUT
U,V,A
*OUTPUT,FIELD
*NODE OUTPUT
U, 
*END STEP