*HEADING
 SUBSTRUCTURE GENERATION FILE FOR psupfre2.inp
*NODE,NSET=NALL
*NGEN,NSET=NALL
*NSET,NSET=NTRA
*TRANSFORM,NSET=NTRA
**
*ELEMENT,TYPE=B21,ELSET=BEAM
*ELGEN,ELSET=BEAM
*BEAMSECTION,ELSET=BEAM,SECT=RECT,MAT=STEEL
*MATERIAL,NAME=STEEL
*ELASTIC
 2.1E11,0.3
*DENSITY
 7800.,
**
*NSET,NSET=RETNODES
**
**
*STEP
*FREQUENCY
6,
*BOUNDARY
  1,1,2
  1,6,6
  RETNODES,1,2
*END STEP
**
**
*STEP
*SUBSTRUCTURE GENERATE,TYPE=Z1,RECOVERYMATRIX=YES,MASSMATRIX=YES,OVERWRITE
*RETAINED NODAL DOFS
  RETNODES,1,2
*RETAINED EIGENMODES,GENERATE
*BOUNDARY
 1,1,2
 1,6,6
*END STEP