*HEADING
 BARREL VAULT  ( 20 X 20 MESH ,  S8R )      
*PREPRINT,ECHO=YES,MODEL=NO,HISTORY=NO
*NODE,SYSTEM=C,NSET=CORNER
 1,300.,0.,0.,
 41, 300.,, 300.
 2001, 300., 40.,
 2041, 300., 40., 300.
*NGEN,LINE=C,NSET=WALL
 1, 2001, 50
*NGEN,LINE=C,NSET=SYMM
 41, 2041,50,,,, 300.
*NFILL
WALL,SYMM,40,1
*NGEN,NSET=APEX
 1, 41
*ELEMENT,TYPE=S8R,ELSET=ROOF1
 1, 1,3,103,101, 2,53,102,51
*ELGEN,ELSET=ROOF
1,20,2,1,20,100,20
*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