*HEADING
 BARREL VAULT  ( 18 X 18 MESH , S4R)  
*PREPRINT,ECHO=YES,MODEL=NO,HISTORY=NO
*NODE,SYSTEM=C,NSET=CORNER
 1,300.,0.,0.,
 19,300.,,300.
 361,300.,40.,
 379,300.,40.,300.
*NGEN,LINE=C,NSET=WALL
 1,361,20
*NGEN,LINE=C,NSET=SYMM
 19,379,20,,,,300.
*NFILL
WALL,SYMM,18,1
*NGEN,NSET=APEX
 1,19
*ELEMENT,TYPE=S4R,ELSET=ROOF1
 1, 1,2,22,21
*ELGEN,ELSET=ROOF
1,18,1,1,18,20,20
*ELSET,ELSET=FEW
 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
 17,18
*MATERIAL,NAME=STEEL
*ELASTIC
 3.E6, 
*BOUNDARY
 APEX,YSYMM
 SYMM,ZSYMM
 WALL,1,2
*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, 
*NODE FILE,NSET=CORNER
U, 
RF, 
*EL FILE
*END STEP