*HEADING
 EARTHQUAKE ANALYSIS (S4R5) VIA MULTIPLE BASE MOTIONS  
 MODAL DYNAMICS MODEL WITH PRIMARY BASE AND SECONDARY BASE (NODE21)
*NODE
1,300.
21, 
101,300.,.5
121,0.,.5
201,300.,1.
221,0.,1.
*NSET,NSET=ENDS
1,21,201,221
*NSET,NSET=NOUT
1,11,21,101,111,211,201,211,221
*NGEN,NSET=NALL
 1,21
 101,121
 201,221
*NSET,NSET=NALL-B2,GEN
 1,20
 101,120
 201,220
*ELSET,ELSET=PR
10, 
*ELEMENT,TYPE=S4R5
1, 1,2,102,101
2, 101,102,202,201
*ELGEN,ELSET=EALL
1,20,1,2
2,20,1,2
*MATERIAL,NAME=A1
*ELASTIC
30.E6, 
*DENSITY
 .000728, 
*SHELL SECTION,MATERIAL=A1,ELSET=EALL
2., 
*NSET,NSET=NODE11
11,
*NSET,NSET=NODETRAN
21,121,221
*TRANSFORM,NSET=NODETRAN,TYPE=R
1.,0.,0., 0.,0.,1.
*BOUNDARY
NODETRAN,1,1
NODETRAN,3,6
NALL-B2,YSYMM
  1, 1
  1, 3
  1, 5
101, 1
101, 3
101, 5
201, 1
201, 3
201, 5
** THIS INPUT ASSUMES THAT bmk/multibasemotion_quake.inp 
** HAS BEEN COPIED TO QUAKE01.AMP 
** AMPLITUDE CURVE DATA FROM 3-1-21-DA
*AMPLITUDE,VALUE=RELATIVE,INPUT=QUAKE01.AMP,NAME=EQ
*RESTART,WRITE,FREQUENCY=25
*STEP
*FREQUENCY,EIGENSOLVER=LANCZOS, SIM=NO
10,,,-1000.
*BOUNDARY,BASE NAME=NODE21
NODETRAN,2,2
*EL PRINT,FREQUENCY=0
*NODE PRINT
U,
*MODAL FILE
*END STEP
*STEP
 EARTHQUAKE INPUT
*MODAL DYNAMIC
.01,2.0
*SELECT EIGENMODES,DEFINITION=FREQUENCY RANGE
0.0,33.0
*BASE MOTION,DOF=3,AMPLITUDE=EQ,SCALE=386.09
*BASE MOTION,DOF=3,AMPLITUDE=EQ,SCALE=386.09,BASE NAME=NODE21
*PRINT,FREQUENCY=50
*EL PRINT,ELSET=PR,FREQUENCY=50
S,E
*NODE PRINT,FREQUENCY=100
U,
TU,
V,
A,
*MODAL PRINT,FREQUENCY=50
GU,GV,GA,
BM, 
*NODE FILE,NSET=NODE11
U,TU,
*NODE FILE,NSET=NOUT,FREQ=50
U,V,A,TU,TV,RF
*MODAL FILE,FREQUENCY=25
GU,GV,GA,BM
*OUTPUT,FIELD, OP=ADD
*NODE OUTPUT,NSET=NODE11
U,TU,
*OUTPUT,HISTORY,OP=ADD
*NODE OUTPUT,NSET=NODE11
U,TU,
*OUTPUT,FIELD, OP=ADD,Frequency=50
*NODE OUTPUT,NSET=NOUT
U,V,A,TU,TV,RF
*OUTPUT,HISTORY,OP=ADD,Frequency=50
*NODE OUTPUT,NSET=NOUT
U,V,A,TU,TV,RF
*OUTPUT,FIELD, OP=ADD,Frequency=25
*MODAL OUTPUT,VARIABLE=ALL
GU,GV,GA,BM
*OUTPUT,HISTORY,OP=ADD,Frequency=25
*MODAL OUTPUT,VARIABLE=ALL
*END STEP