*HEADING
: PIPE FRAME SECTION,  INITIAL STRESSES [FRAME2D]
PERUTBATION/LOAD CASE
*FILE FORMAT, ZERO INCREMENT 
*NODE
 1,  0.0, 0.0
11, 75., 0.0
*NGEN,NSET=ALL
 1,11,2
*ELEMENT,TYPE=FRAME2D, ELSET="ALL ELEMENTS"
1,1,3
2,3,5
3,5,7
4,7,9
5,9,11
*ELSET, ELSET=FOUR
4, 
*FRAME SECTION,SECTION=GENERAL, ELSET="ALL ELEMENTS", DENSITY=8000.0E-4
2.387610, 4.309637, 0., 4.309637, 4.3215749
0., 0., -1.
3.E6, 1.1538E6, .001
*BOUNDARY
1,1,2
1,6
*INITIAL CONDITIONS, TYPE=STRESS
5, -3.581415e1, -187.5E-4
4, -3.581415e1, -562.5E-4
3, -3.581415e1, -937.5E-4
2, -3.581415e1, -1312.5E-4
1, -3.581415e1, -1687.5E-4
*BOUNDARY
1, 1, 2
1, 6
*********************** STEP 1
*STEP
 testing the initial stresses.
*STATIC
*EL PRINT
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=CENTROIDAL 
SF,
SEE,
*EL FILE, ELSET=FOUR
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=CENTROIDAL 
SF,
SEE,
*NODE FILE
 U,COORD
 RF,
*NODE PRINT
 U,
 RF, 
*ENERGY FILE
*END STEP
*********************** STEP 2
*STEP
*STATIC
*CLOAD
11,2,25.E-4
11,1, -3.581415e1
*END STEP
*********************** STEP 3
*STEP,PERTURBATION
*STATIC
*DLOAD
"ALL ELEMENTS", GRAV,1.0E-3, 0., -1., 0.
*EL PRINT
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=CENTROIDAL 
SF,
SEE,
*EL FILE, ELSET=FOUR
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=CENTROIDAL 
SF,
SEE,
*NODE FILE
 U,COORD
 RF,
*NODE PRINT
 U,
 RF, 
*ENERGY FILE
*END STEP
*********************** STEP 4
*STEP
 same as 2nd step 
*STATIC
*DLOAD
"ALL ELEMENTS", PY, -1.910088E-3
*END STEP
*********************** STEP 5
*STEP,PERTURBATION
*STATIC
*DLOAD
"ALL ELEMENTS", P2, -1.910088E-3
*EL PRINT
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=CENTROIDAL 
SF,
SEE,
*EL FILE, ELSET=FOUR
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*EL FILE, ELSET=FOUR, POSITION=CENTROIDAL 
SF,
SEE,
*NODE FILE
 U,COORD
 RF,
*NODE PRINT
 U,
 RF, 
*ENERGY FILE
*END STEP
*********************** STEP 6
*STEP
axial compressive loading.
*STATIC
*DLOAD
"ALL ELEMENTS", PX, -1.910088E-3
*END STEP

*********************** STEP 7
*STEP,PERTURBATION
*STATIC
*LOAD CASE,NAME=PRESSURE-1
*DLOAD
"ALL ELEMENTS", P2, -1.910088E-3
*END LOAD CASE
*LOAD CASE,NAME=PRESSURE-2 
*DLOAD
"ALL ELEMENTS", P2, -1.910088E-3
*END LOAD CASE
*EL PRINT
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=AVERAGED AT NODES
SF,
SEE,
*EL PRINT, ELSET=FOUR, POSITION=NODES
SF,
SEE,
*OUTPUT,FIELD
*ELEMENT OUTPUT
SF,SEE
*NODE OUTPUT
U,COORD,RF
*END STEP