*HEADING
 EARTHQUAKE ANALYSIS  B21                  
*NODE
1 ,, 300.
51, 
*NSET,NSET=ENDS
1,51
*NGEN
 1,51
*ELEMENT,TYPE=B21
1,1,2
*ELGEN,ELSET=EALL
1,50
*MATERIAL,NAME=A1
*ELASTIC
30.E6, 
*DENSITY
 .000728, 
*BEAM SECTION,SECTION=RECT,MATERIAL=A1,ELSET=EALL
1. , 2.
*BOUNDARY
51, 1, 6
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
12, , 
*EL PRINT,FREQUENCY=0
*NODE PRINT
U, 
*NODE FILE
U, 
*OUTPUT,FIELD,OP=NEW
*NODE OUTPUT
U,
*OUTPUT,HISTORY,OP=NEW
*NODE OUTPUT, NSET=ENDS
U,
*END STEP