*HEADING
DSA CANTILEVER PROBLEM
1x50 MESH using 50 beam elements 
*PREPRINT, MODEL=YES
*PARAMETER
L=0.0
*DESIGN PARAMETER
L,
*Node
    1,    0.0, 0.0, 0.0
   51,  100.0, 0.0, 0.0
*NGEN, NSET=N1
  1,  51, 1
*PARAMETER SHAPE VARIATION, PARAMETER=L
    1, -1.0, 0.0, 0.0
*ELEMENT, TYPE=B31
1,1,2
*ELGEN, ELSET=EALL
  1,  50, 1, 1
*BEAM SECTION,SECTION=RECT,ELSET=EALL,MATERIAL=ABAQUS
 1,2   
*MATERIAL, NAME=ABAQUS
*ELASTIC
210000., 0.1
*DENSITY
0.1,
*ELSET,ELSET=EFIXED
50,
*NSET,NSET=BOUND
 51,
*NSET,NSET=NFREE
1,
*BOUNDARY
BOUND, 1, 6, 0.0
*STEP, DSA
*STATIC
1.0, 1.0
*CLOAD
  1, 2,1
*OUTPUT, FIELD
*ELEMENT OUTPUT,ELSET=EFIXED
S,
*NODE OUTPUT,NSET=NFREE
U,
*OUTPUT, HISTORY, FREQUENCY=0
*DESIGN RESPONSE
*NODE RESPONSE,NSET=NFREE
U,
*ELEMENT RESPONSE,ELSET=EFIXED
S,
*END STEP
*STEP,DSA
*FREQUENCY,EIGENSOL=LANCZOS, SIM=NO
 10
***DSA CONTROLS, SIZING FREQUENCY=1
*DESIGN RESPONSE
*END STEP