*HEADING
 SQUARE PLATE - ELASTIC BUCKLING  ( BUCKLE )- STRI3 4 x 4
*NODE
*NGEN,NSET=YSYM
*NGEN,NSET=XSYM
*NGEN,NSET=YEDG
*NGEN,NSET=XEDG
*NFILL
XSYM,XEDG,4,1
*ELEMENT,TYPE=STRI3,ELSET=ONE
*ELGEN,ELSET=ONE
*SHELL SECTION,MATERIAL=A1,ELSET=ONE
0.01,3
*MATERIAL,NAME=A1
*ELASTIC
1.E8,0.3
*BOUNDARY
YSYM,YSYMM
XSYM,XSYMM
YEDG,3
YEDG,5
XEDG,3
XEDG,4
XEDG,6
*STEP
*BUCKLE
3,
*CLOAD
105,1,-12.5
205,1,-25.0
305,1,-25.0
405,1,-25.0
505,1,-12.5
*NODE PRINT
U,
*MODAL FILE
*END STEP