*HEADING
 o FOUR PLANE STRAIN ELEMENTS (CPE4)
 o ONE ELASTIC MATERIAL
 o DSA CONTROLS
*RESTART, WRITE
*PARAMETER
YC = 0.0
NU = 0.1
DENS=0.1 
*DESIGN PARAMETER
YC,NU,DENS  
*NODE
1, 0.0, 0.0, 0.0
2, 1.0, 0.0, 0.0
3, 2.0, 0.0, 0.0
4, 0.0, 1.0, 0.0
5, 1.0, 1.0, 0.0
6, 2.0, 1.0, 0.0
7, 0.0, 2.0, 0.0
8, 1.0, 2.0, 0.0
9, 2.0, 2.0, 0.0
*PARAMETER SHAPE VARIATION, PARAMETER=YC
8, 0.0, 1.0, 0.0
9, 0.0, 2.0, 0.0
*NSET, NSET=FIXED
1, 
*NSET, NSET=ROLL
2, 3
*ELEMENT, TYPE=CPE4, ELSET=EALL
1, 1, 2, 5, 4
2, 2, 3, 6, 5
3, 4, 5, 8, 7
4, 5, 6, 9, 8
*SOLID SECTION, MATERIAL=ABAQUS, ELSET=EALL
*MATERIAL, NAME=ABAQUS
*ELASTIC
2.0E05,<NU>
*DENSITY
<DENS>,
*BOUNDARY
FIXED, 1, 2, 0.0
ROLL,  2, 2, 0.0
*DSA CONTROLS, FORMULATION=INCREMENTAL
DENS, CD, 1.0e-06
*STEP,DSA,NLGEOM
*STATIC,DIRECT
0.2,1.0
*DLOAD
3, P3, 100.0
4, P3, 100.0
*DLOAD
3, GRAV, 5.0, 0.0, 1.0, 0.0
4, GRAV, 5.0, 0.0, 1.0, 0.0
*DESIGN RESPONSE, FREQUENCY=5
*ELEMENT RESPONSE
S,E
mass,
*NODE RESPONSE
U,
*OUTPUT, HISTORY, FREQUENCY=0
*END STEP
*STEP,DSA
*FREQUENCY, EIGENSOLVER=SUBSPACE
2,
*DESIGN RESPONSE
*END STEP
**
** SIGN: G5oq4b+H7ArKTw==
**