** SUBSTRUCTURE GENERATION FILE for substrframe_1level.inp
*NODE
1,
11,  ,2.4
*NGEN
1,11   
*ELEMENT,TYPE=B21,ELSET=COLUMN
1,1,2
*ELGEN,ELSET=COLUMN
1,10
*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=Z101,MASS MATRIX=YES,OVERWRITE
*RETAINED NODAL DOFS
1,
11,
*END STEP