*HEADING
o INCREMENTAL DSA ANALYSIS, AXISYMMETRIC ELEMENTS
o TWO STEPS
*PARAMETER
E=1.0e06
T=1.0
X=0.0
*DESIGN PARAMETER
T,X 
*NODE
** MAX1
1, 50.0, 100.0
2, 50.0,  90.0
** MAX2
3, 50.0,  80.0
4, 50.0,  75.0
5, 50.0,  70.0
*PARAMETER SHAPE VARIATION, PARAMETER=X
1, 1.0, 0.0
2, 1.0, 0.0
3, 1.0, 0.0
4, 1.0, 0.0
5, 1.0, 0.0
*ELEMENT, TYPE=MAX1, ELSET=MAX1
1, 2, 1
*ELEMENT, TYPE=MAX2, ELSET=MAX2
2, 5, 4, 3
*ELSET, ELSET=EALL
MAX1, MAX2
*MATERIAL, NAME=STEEL
*ELASTIC
<E>, 0.3
*MEMBRANE SECTION, ELSET=EALL, MATERIAL=STEEL
<T>,
*NSET, NSET=VERTICAL
2, 5, 
*SURFACE,NAME=S1
1, SPOS
*SURFACE, NAME=S2
2, SPOS
*BOUNDARY
VERTICAL, 1, 2, 0.0
*DSA CONTROLS, FORMULATION=TOTAL
T,CD,0.01
X,CD,0.001
*STEP, NLGEOM, DSA
Initial Load
*STATIC
0.1, 1.0
*CLOAD
1, 2, 1.0
3, 2, 1.0
*OUTPUT, FIELD
*NODE OUTPUT
U,
RF,
*ELEMENT OUTPUT
S,
LE,
*DESIGN RESPONSE
*NODE RESPONSE
U,
RF,
*ELEMENT RESPONSE
S,
LE,
*END STEP
*STEP, NLGEOM
PRESSURE
*STATIC
0.1,1.0
*DSLOAD
S1, P, 0.5
S2, P, 0.5
*END STEP