*HEADING
 TEST WITH THREE SUBSTRUCTURES        
 SUBSTRUCTURE GENERATION FILES substrframe_1level_gen1.inp AND 
 substrframe_1level_gen2.inp SHOULD BE RUN FIRST
**
*ELEMENT,TYPE=Z101,ELSET=SUPER, FILE=substrframe_1level_gen1
61 , 1,11
63 ,31,21
*ELEMENT,TYPE=Z201,ELSET=SUPER, FILE=substrframe_1level_gen2
62 ,11,21
*SUBSTRUCTURE PROPERTY, ELSET=SUPER
*BOUNDARY
1,1,6
31,1,6
*RESTART, WRITE
*STEP
*STATIC     
*SLOAD
62 , SNOW, -235.
*OUTPUT,VAR=PRESELECT,FIELD
*SUBSTRUCTURE PATH, ENTER ELEMENT=61
*OUTPUT,VAR=PRESELECT,FIELD
*NODE PRINT
U, 
*EL PRINT
S,E
*SUBSTRUCTURE PATH, LEAVE, ENTER ELEMENT=62
*OUTPUT,VAR=PRESELECT,FIELD
*NODE PRINT
U, 
*NODE FILE
U, 
*SUBSTRUCTURE PATH, LEAVE
*NODE PRINT
U,RF
*NODE FILE
U,RF
*END STEP
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
10, , 
*MODAL FILE
*END STEP