**SUBSTRUCTURE GENERATION FILE FOR substrframe_2level.inp
** substructure for half the horizontal beam
*NODE
1 ,
6 , 4.
*NGEN
1,6
*ELEMENT,TYPE=B21,ELSET=BEAM
1,1,2
*ELGEN,ELSET=BEAM
1,5
*BEAM SECTION,SECTION=RECT,MATERIAL=STEEL,ELSET=BEAM
0.1 , 0.1
*MATERIAL,NAME=STEEL
*ELASTIC
2.1E11 , 0.3
*DENSITY 
7200., 
**
**
*STEP
*SUBSTRUCTURE GENERATE,TYPE=Z92,MASS MATRIX=YES,OVERWRITE
*RETAINED NODAL DOFS
1 ,1,6
6,1,6
*SUBSTRUCTURE LOAD CASE, NAME=PSNOW
*DLOAD
BEAM,PY , 1.
*END STEP