*HEADING
 BARREL VAULT  ( 20 X 20 MESH ,  S8R )
*PREPRINT,ECHO=YES,MODEL=NO,HISTORY=NO
*NODE,SYSTEM=C,NSET=CORNER
*NGEN,LINE=C,NSET=WALL
*NGEN,LINE=C,NSET=SYMM
*NFILL
WALL,SYMM,40,1
*NGEN,NSET=APEX
*ELEMENT,TYPE=S8R,ELSET=ROOF1
*ELGEN,ELSET=ROOF
*MATERIAL,NAME=STEEL
*ELASTIC
 3.E6,
*BOUNDARY
 APEX,2
 APEX,4
 APEX,6
 SYMM,3,5
 WALL,1,2
 WALL,6
*SHELL SECTION,MATERIAL=STEEL,ELSET=ROOF
 3.0,3
*STEP
 SELF-WEIGHT
*STATIC
*DLOAD
 ROOF,BX,-0.20833
*ENERGY PRINT
*EL PRINT,FREQUENCY=0
*EL FILE,ELSET=ROOF1
S,
E,
*NODE FILE,NSET=CORNER
U,
RF,
*END STEP