*HEADING
STABILIZED COMPRESSION OF REINFORCED PLATE              
*PREPRINT,ECHO=NO,HISTORY=NO,MODEL=YES
**
************************************************
** FILE WITH NODE DEFINITIONS AND NSETS:
**      COTE1
**      COTE2
**      COTE3
**      COTE4
************************************************
**
*INCLUDE,INPUT=unstablestatic_plate_node.inp
**
************************************************
** FILE WITH ELEMENT DEFINITIONS AND ELSETS:
**      E0000001  144 B31
**      E0000002  144 B31
**      E0000003    6 S3
**      E0000004    8 S3
**      TOLE     1008 S4
**      E0000006  288 S4
**      E0000007  252 S4
**      E0000008  178 S4
**      E0000009  108 S4
**      E0000010   78 S4
************************************************
**
*INCLUDE,INPUT=unstablestatic_plate_elem.inp
**
*ELEMENT,TYPE=SPRING1,ELSET=EPONT
 50000,340
 50001,2881
*SPRING,ELSET=EPONT
 3,
 5.3E+08,
*BEAM SECTION,MATERIAL=ACIER,SECTION=RECT,
ELSET=E0000001
 1.500000E-02, 1.500000E-02
 0.000000E+00, 6.557236E-03,-9.999785E-01
*MATERIAL,NAME=ACIER   
*ELASTIC
 2.100E+11,  3.000E-01
*PLASTIC
 235.259E+06,0.0
 471.9E+06,0.18837
*DENSITY
 7.850E+03, 
*BEAM SECTION,MATERIAL=ACIER,SECTION=RECT,
ELSET=E0000002
 1.500000E-02, 1.500000E-02
 0.000000E+00, 8.695324E-03,-9.999622E-01
*SHELL SECTION,ELSET=E0000003,MATERIAL=ACIER   
 7.000E-03,     3
*SHELL SECTION,ELSET=E0000004,MATERIAL=ACIER   
 1.000E-02,     3
*SHELL SECTION,ELSET=TOLE,MATERIAL=ACIER   
 5.000E-03,     3
*SHELL SECTION,ELSET=E0000006,MATERIAL=ACIER   
 6.000E-03,     3
*SHELL SECTION,ELSET=E0000007,MATERIAL=ACIER   
 7.000E-03,     3
*SHELL SECTION,ELSET=E0000008,MATERIAL=ACIER   
 1.000E-02,     3
*SHELL SECTION,ELSET=E0000009,MATERIAL=ACIER   
 1.000E-02,     3
*SHELL SECTION,ELSET=E0000010,MATERIAL=ACIER   
 1.000E-02,     3
*NSET,NSET=NM1
 329, 
*ELSET,ELSET=HILOIRE 
E0000004,E0000009,E0000010
*ELSET,ELSET=BARROTS 
E0000003,E0000007,E0000008
*ELSET,ELSET=TOT     
TOLE,HILOIRE,BARROTS,E0000001,E0000002,E0000006
**
*MPC
BEAM,COTE1,NM1
**
*BOUNDARY
NM1,3,3
NM1,4,4
NM1,6,6
COTE2,1,1
COTE2,3,3
COTE2,4,4
COTE2,6,6
8896,2,2
COTE3,2,2
COTE3,4,4
COTE3,6,6
COTE4,2,2
COTE4,4,4
COTE4,6,6
**
*RESTART,WRITE,F=30
**    
************************************************
**
*STEP,NLGEOM,INC=1
GRAVITY LOAD
*STATIC
1.,1.
*CONTROLS,PARAMETERS=FIELD
,
,0.,
*DLOAD
TOT,GRAV,9.81,0,0,-1.
*NODE FILE,NSET=NM1,FREQ=1
U,CF
*EL FILE,ELSET=HILOIRE,FREQ=200
S,E,PE 
*ENERGY FILE 
*OUTPUT,FIELD,FREQ=30
*NODE OUTPUT
 U,
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=NM1
U,CF
*ENERGY OUTPUT,VARIABLE=ALL
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
*END STEP
**
*STEP,NLGEOM,INC=1000
BUCKLING LOAD
*STATIC,STABILIZE,ALLSDTOL
0.05,1.,,
*CONTROLS,RESET
*CLOAD
NM1,1,646.E+04
*END STEP