*HEADING
******************
** MIDDLE LAYER **
******************
*NODE,NSET=SIDES
*NGEN,NSET=BOTTOM
*NGEN,NSET=MID
*NGEN,NSET=TOP
*ELEMENT,TYPE=CPE8R,ELSET=EALL
*SOLID SECTION,ELSET=EALL,MATERIAL=ELAS
*MATERIAL,NAME=ELAS
*DENSITY
1.,
*ELASTIC
2.8E7, .2
***INITIAL CONDITIONS,TYPE=STRESS,GEOSTATIC
**EALL, -833.33, -33.33, -1666.66, -66.66, 0.333
**
**
*STEP
*SUBSTRUCTURE GENERATE,TYPE=Z2,OVERWRITE
*RETAINED NODAL DOFS,SORTED=NO
BOTTOM,2
TOP,2
*SUBSTRUCTURE LOAD CASE,NAME=BOUND
*DLOAD
EALL,GRAV,25., 0.,-1.,0.
*BOUNDARY
SIDES,1
*END STEP