** SUBSTRUCTURE GENERATION FILE FOR substrframe_2level.inp
**  substructure for half a column
*NODE
1,
6,  ,1.2
*NGEN
1,6
*ELEMENT,TYPE=B21,ELSET=COLUMN
1,1,2
*ELGEN,ELSET=COLUMN
1,5
*BEAM SECTION,SECTION=RECT,MATERIAL=STEEL,ELSET=COLUMN
0.1 , 0.1
*MATERIAL,NAME=STEEL
*ELASTIC
2.1E11 , 0.3
*DENSITY
7200., 
**
**
*STEP
*SUBSTRUCTURE GENERATE,TYPE=Z91,MASS MATRIX=YES,OVERWRITE
*RETAINED NODAL DOFS
1,                                     
6,
*END STEP