*HEADING
 RING BUCKLE EIGENVALUE ESTIMATE  3 - B21
*NODE
*NGEN,LINE=C
*ELEMENT,TYPE=B21,ELSET=ONE
*ELGEN,ELSET=RING
*BEAM SECTION,SECTION=RECT,MATERIAL=A1,ELSET=RING
1.,1.
0.,0.,-1.
*MATERIAL,NAME=A1
*ELASTIC
30.E6,0.
*NSET,NSET=END
*TRANSFORM,NSET=END
*BOUNDARY
1,2
1,6
4,2
4,6
*STEP,NLGEOM
*BUCKLE
3,
*BOUNDARY,LOAD CASE = 2, OP=NEW
1,2
1,6
4,1
*DLOAD
RING,P2,1.
*EL PRINT,FREQUENCY=0
*NODE PRINT ,SUMMARY=NO
U,RF
*MODAL PRINT
*MODAL FILE
*OUTPUT,FIELD,VAR=PRESELECT
*END STEP