*HEADING
 FRAME TO BE USED FOR TESTING SUBSTRUCTURE CAPABILITIES   
*NODE
1  ,
11 ,     , 2.4
21 , 8.0 , 2.4
31 , 8.0 , 0.
*NGEN
1,11
11,21
21,31
*ELEMENT,TYPE=B21,ELSET=SQUARE
1  ,   1 , 2
*ELGEN,ELSET=SQUARE
1  ,  30 , 1 , 1
*ELSET,ELSET=BEAM,GENERATE
11,20
*BEAM SECTION,SECTION=RECT,ELSET=SQUARE,MATERIAL=STEEL
0.1 , 0.1
*MATERIAL,NAME=STEEL
*ELASTIC
2.1E11 , 0.3
*DENSITY
7200., 
*BOUNDARY
1 , 1,6
31, 1,6
*RESTART,WRITE
*STEP
*STATIC
*DLOAD
BEAM, PY , -235.
*EL PRINT
E , S ,
*NODE FILE
U,
*OUTPUT,FIELD
*NODE OUTPUT
U,
*END STEP
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
10, , 
*NODE FILE,FREQUENCY=0
*OUTPUT,FIELD,FREQ=0
*NODE OUTPUT
*MODAL FILE
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*EL PRINT,FREQUENCY=0
*END STEP