*HEADING
 RING BUCKLE EIGENVALUE ESTIMATE ( 1 SAXA22 )    
*NODE
 1,100.,0.
 2,100.,0.5
 3,100.,1.
*ELEMENT,TYPE=SAXA22,OFFSET=100,ELSET=EALL
  1,1,2,3  
*ELSET,ELSET=ALL
 1,
*SHELL SECTION,MATERIAL=MAT,ELSET=EALL           
 1.,3
*MATERIAL,NAME=MAT
*ELASTIC
 30.0E6,0.0
*NSET,NSET=NALL,GENERATE
   1,  3,1
 101,103,1
 201,203,1
*EQUATION
 2,
 201,1,1.0,  1,1,-1.0
 2,
 202,1,1.0,  2,1,-1.0
 2,
 203,1,1.0,  3,1,-1.0
*BOUNDARY
 NALL,2
 NALL,6
*STEP
*BUCKLE
 1,
*DLOAD
 ALL,P,1.0
*MODAL FILE
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP