*HEADING
: PATCH TEST FOR BEAM ELEMENTS  [PIPE21H]
*NODE
 1,
 4,10.0
*NGEN
 1,4
*ELEMENT,TYPE=PIPE21H
 1, 1,2
*ELGEN,ELSET=ALL
 1,3,1,1
*ELSET,ELSET=EL3,GENERATE
1, 4
*BEAM SECTION,SECTION=PIPE,ELSET=ALL,MATERIAL=MAT
 0.1,0.017435473
*MATERIAL,NAME=MAT
*ELASTIC
 30E6,0.0
*NSET,NSET=END1
 1, 
*NSET,NSET=END2
 4, 
*STEP,PERTURBATION
*STATIC
*BOUNDARY
 END1,1,,0.01
 END1,2
 END1,6
 END2,1,,0.11
 END2,6
*EL PRINT
 SF, 
*EL PRINT,POSITION=NODES
 SF, 
*EL PRINT,POSITION=AVERAGED AT NODES
 SF, 
*EL PRINT,POSITION=CENTROID
 SF, 
*EL FILE
 SF, 
*EL FILE,POSITION=NODES
 SF, 
*EL FILE,POSITION=AVERAGED AT NODES
 SF, 
*EL FILE,POSITION=CENTROID
 SF, 
*NODE PRINT,FREQ=0
*END STEP
*STEP,NLGEOM
*STATIC
*CLOAD
4, 1, 3000.
*BOUNDARY
1,1,6
4,2
*EL PRINT,SUMMARY=NO,ELSET=EL3
S,E
*EL FILE,ELSET=EL3
S,E
*NODE PRINT,SUMMARY=NO
U,RF
*NODE FILE
U,RF
*END STEP
*STEP,PERTURBATION
*STATIC
*BOUNDARY,OP=NEW
 END1,1,,0.01
 END1,2
 END1,6
 END2,1,,0.11
 END2,6
*EL PRINT
 SF, 
*EL PRINT,POSITION=NODES
 SF, 
*EL PRINT,POSITION=AVERAGED AT NODES
 SF, 
*EL PRINT,POSITION=CENTROID
 SF, 
*EL FILE
 SF, 
*EL FILE,POSITION=NODES
 SF, 
*EL FILE,POSITION=AVERAGED AT NODES
 SF, 
*EL FILE,POSITION=CENTROID
 SF, 
*NODE PRINT,FREQ=0
*END STEP