*HEADING
 UNDERWOOD & PARK 2 D.O.F. SYSTEM (TEMP & FV DEPENDENT SPRING/DASHPOT)
*NODE,NSET=FILE
2,10,,
3,20,,
*ELEMENT,TYPE=SPRING1,ELSET=SPRING1
1,2
*ELEMENT,TYPE=MASS,ELSET=MASS
2,2
*ELEMENT,TYPE=SPRING2,ELSET=SPRING2
3,2,3
*ELEMENT,TYPE=DASHPOT2,ELSET=DASHPOT
4,2,3
*ELEMENT,TYPE=MASS,ELSET=MASS
5,3
*ELEMENT,TYPE=SPRING1,ELSET=SPRING3
6,3
*ELSET,ELSET=MODEL,GENERATE
1,6
*MASS,ELSET=MASS
1.0, 
** TEMPERATURE DEPENDENT DASHPOT
*DASHPOT,ELSET=DASHPOT
1,1
4.5,,50.
5.5,,100.
** TEMPERATURE DEPENDENT SPRING
*SPRING,ELSET=SPRING2
1,1
 90.,,50.
110.,,100.
**FIELD VARIABLE DEPENDENT NONLINEAR SPRING
*SPRING,NONLINEAR,ELSET=SPRING1,DEPENDENCIES=1
1, 
-1099.8999,-5.0,,50.
-1099.2619,-4.0,,50.
-1094.5602,-3.0,,50.
-1060.4303,-2.0,,50.
-1035.5125,-1.75,,50.
-995.6628,-1.5,,50.
-933.1124,-1.25,,50.
-837.7535,-1.0,,50.
-698.6628,-0.75,,50.
-508.3287,-0.5,,50.
-269.4109,-0.25,,50.
0.0,0.0,,50.
269.4109,0.25,,50.
508.3287,0.5,,50.
698.6628,0.75,,50.
837.7535,1.0,,50.
933.1124,1.25,,50.
995.6628,1.5,,50.
1035.5125,1.75,,50.
1060.4303,2.0,,50.
1094.5602,3.0,,50.
1099.2619,4.0,,50.
1099.8999,5.0,,50.
-899.9181,-5.0,,100.
-899.3961,-4.0,,100.
-895.5492,-3.0,,100.
-867.6248,-2.0,,100.
-847.2375,-1.75,,100.
-814.6332,-1.5,,100.
-763.4556,-1.25,,100.
-685.4347,-1.0,,100.
-571.6332,-0.75,,100.
-415.9053,-0.5,,100.
-220.4271,-0.25,,100.
0.0,0.0,,100.
220.4271,0.25,,100.
415.9053,0.5,,100.
571.6332,0.75,,100.
685.4347,1.0,,100.
763.4556,1.25,,100.
814.6332,1.5,,100.
847.2375,1.75,,100.
867.6248,2.0,,100.
895.5492,3.0,,100.
899.3961,4.0,,100.
899.9181,5.0,,100.
**FIELD VARIABLE DEPENDENT NONLINEAR SPRING
*SPRING,NONLINEAR,ELSET=SPRING3,DEPENDENCIES=2
 1, 
-81623.52,-5.0,,,50.
-63566.602,-4.75,,,50.
-49503.3,-4.5,,,50.
-30017.9,-4.0,,,50.
-18196.86,-3.5,,,50.
-11019.657,-3.0,,,50.
-6655.2244,-2.5,,,50.
-3989.546,-2.0,,,50.
-2342.208,-1.5,,,50.
-1292.7211,-1.0,,,50.
-573.2045,-0.5,,,50.
0.0,0.0,,,50.
573.2045,0.5,,,50.
1292.7211,1.0,,,50.
2342.208,1.5,,,50.
3989.546,2.0,,,50.
6655.2244,2.5,,,50.
11019.657,3.0,,,50.
18196.86,3.5,,,50.
30017.9,4.0,,,50.
49503.3,4.5,,,50.
63566.602,4.75,,,50.
81623.52,5.0,,,50.
-66782.88,-5.0,,,100.
-52009.038,-4.75,,,100.
-40502.7,-4.5,,,100.
-24560.1,-4.0,,,100.
-14888.34,-3.5,,,100.
-9016.083,-3.0,,,100.
-5445.1836,-2.5,,,100.
-3264.174,-2.0,,,100.
-1916.352,-1.5,,,100.
-1057.6809,-1.0,,,100.
-468.9855,-0.5,,,100.
0.0,0.0,,,100.
468.9855,0.5,,,100.
1057.6809,1.0,,,100.
1916.352,1.5,,,100.
3264.174,2.0,,,100.
5445.1836,2.5,,,100.
9016.083,3.0,,,100.
14888.34,3.5,,,100.
24560.1,4.0,,,100.
40502.7,4.5,,,100.
52009.038,4.75,,,100.
66782.88,5.0,,,100.
*AMPLITUDE,NAME=STEPFCN
0.0,1.0, 1.0,1.0
*INITIAL CONDITIONS,TYPE=TEMPERATURE
2,1,50.0
*INITIAL CONDITIONS,TYPE=FIELD,VARIABLE=1
2,1,50.0
*INITIAL CONDITIONS,TYPE=FIELD,VARIABLE=2
2,1,50.0
*INITIAL CONDITIONS,TYPE=VELOCITY
2,1,100.0
*BOUNDARY
2,2,3
3,2,3
*STEP,NLGEOM,INC=50
*DYNAMIC,DIRECT
0.01,0.5
*PRINT,RESIDUAL=NO,FREQUENCY=5
*ENERGY PRINT,FREQUENCY=5
*EL PRINT,FREQUENCY=25,SUMMARY=NO
*NODE PRINT,FREQUENCY=5,SUMMARY=NO
U1,V1,A1,RF1
*NODE FILE,NSET=FILE
U, 
V, 
*MONITOR,NODE=2,DOF=1,FREQUENCY=5
*FILE FORMAT,ZERO INCREMENT
*TEMPERATURE,AMP=STEPFCN
FILE,75.0
*FIELD,VARIABLE=1,AMP=STEPFCN
FILE,75.0
*FIELD,VARIABLE=2,AMP=STEPFCN
FILE,75.0
*END STEP
*STEP,NLGEOM,INC=50
*DYNAMIC,DIRECT
0.001,0.05
*CLOAD
3,1,3000.0
*END STEP
*STEP,NLGEOM,INC=50
*DYNAMIC,DIRECT
0.01,0.45
*CLOAD,OP=NEW
*TEMPERATURE,AMP=STEPFCN
FILE,75.0
*FIELD,VARIABLE=1,AMP=STEPFCN
FILE,75.0
*FIELD,VARIABLE=2,AMP=STEPFCN
FILE,75.0
*END STEP