*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
** MGAX1
6, 50.0,  60.0
7, 50.0,  50.0
** MGAX2
8, 50.0,  40.0
9, 50.0,  35.0
10,50.0,  30.0
*PARAMETER SHAPE VARIATION, PARAMETER=X
6, 1.0, 0.0
7, 1.0, 0.0
8, 1.0, 0.0
9, 1.0, 0.0
10,1.0, 0.0
*ELEMENT, TYPE=MGAX1, ELSET=MGAX1
3, 7, 6
*ELEMENT, TYPE=MGAX2, ELSET=MGAX2
4, 10, 9, 8
*ELSET, ELSET=EALL
MGAX1, MGAX2
*MATERIAL, NAME=STEEL
*ELASTIC
<E>, 0.3
*MEMBRANE SECTION, ELSET=EALL, MATERIAL=STEEL
<T>,
*NSET, NSET=VERTICAL
7, 10
*NSET,NSET=TWIST
7, 10
*SURFACE, NAME=S3
3, SPOS
*SURFACE,NAME=S4
4, SPOS
*BOUNDARY
VERTICAL, 1, 2, 0.0
TWIST, 5, 5, 0.0
*DSA CONTROLS
T,CD,0.01
X,CD,0.001
*STEP, NLGEOM, DSA
Initial Load
*STATIC
0.1, 1.0
*CLOAD
6, 2, 1.0
8, 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
S3, P, 0.5
S4, P, 0.5
*CLOAD
6, 5, 5.0
8, 5, 5.0
*END STEP