*HEADING
: LINEAR BEHAVIOR OF SPRING AND DASHPOT ELEMENTS
[SPRING1, SPRING2, SPRINGA, DASHPOT1, DASHPOT2, DASHPOTA] 
**Same as EXSD3GLX but with temp/fv dependent spring/dashpot properties
*********************************************
** Define three spring/dashpot 
** systems to be analyzed simultaneously
*********************************************
*NODE,NSET=NALL
 3,10.,0.
 11,0.,10.
 12,10.,10.
 13,20.,10.
*NODE,NSET=TRANS
 101,0.,20.
 102,10.,30.
 103,20.,40.
*NSET,NSET=NALL
 TRANS, 
*TRANSFORM,NSET=TRANS,TYPE=R
 1.,1.,0.,-1.,1.,0.
**
** Spring Definitions
**
*ELEMENT,TYPE=SPRING1,ELSET=SPRINGELEMENT-1
 1,3
*ELEMENT,TYPE=SPRING2,ELSET=SPRINGELEMENT-2
 2,12,11
 3,13,12
*ELEMENT,TYPE=SPRINGA,ELSET=SPRINGELEMENT-A
 4,102,101
 5,103,102
**
** Dashpot Definitions
**
*ELEMENT,TYPE=DASHPOT1,ELSET=DASHPOTELEMENT-1
 6,3
*ELEMENT,TYPE=DASHPOT2,ELSET=DASHPOTELEMENT-2
 7,13,12
*ELEMENT,TYPE=DASHPOTA,ELSET=DASHPOTELEMENT-A
 8,103,102
**
** Point Masses
**
*ELEMENT,TYPE=MASS,ELSET=MASS_ELEMENTS
 9,3
 10,12
 11,13
 12,102
 13,103
*NSET,NSET=MASSES
 3,12,13,102,103
**
** Property Definitions
**
*ORIENTATION,NAME=TRANSFORMATION,DEFINITION=COORDINATES
 1.,1.,0.,-1.,1.,0.
*SPRING,ELSET=SPRINGELEMENT-1,DEPENDENCIES=2
 1, 
 1.e-10,,  0.,0.,0.
   30.0,,200.,0.,0.
 1.e-10,,  0.,2.,0.
   50.0,,200.,2.,0.
 1.e-10,,  0.,0.,2.
   70.0,,200.,0.,2.
 1.e-10,,  0.,2.,2.
   90.0,,200.,2.,2.
*SPRING,ELSET=SPRINGELEMENT-2,DEPENDENCIES=2
 1,1
 1.e-10,,  0.,0.,0.
   30.0,,200.,0.,0.
 1.e-10,,  0.,2.,0.
   50.0,,200.,2.,0.
 1.e-10,,  0.,0.,2.
   70.0,,200.,0.,2.
 1.e-10,,  0.,2.,2.
   90.0,,200.,2.,2.
*SPRING,ELSET=SPRINGELEMENT-A,ORIENTATION=TRANSFORMATION,DEPENDENCIES=2

 1.e-10,,0.,0.,0.
 30.0,,200.,0.,0.
 1.e-10,,0.,2.,0.
 50.0,,200.,2.,0.
 1.e-10,,0.,0.,2.
 70.0,,200.,0.,2.
 1.e-10,,0.,2.,2.
 90.0,,200.,2.,2.
*DASHPOT,ELSET=DASHPOTELEMENT-1
 1, 
 1.e-10,,0.0
 0.24,,200.
*DASHPOT,ELSET=DASHPOTELEMENT-2,DEPENDENCIES=2
 1,1
 1.e-10,,0.,0.,0.
 0.18,,200.,0.,0.
 1.e-10,,0.,2.,0.
 0.22,,200.,2.,0.
 1.e-10,,0.,0.,2.
 0.26,,200.,0.,2.
 1.e-10,,0.,2.,2.
 0.30,,200.,2.,2.
*DASHPOT,ELSET=DASHPOTELEMENT-A,ORIENTATION=TRANSFORMATION,DEPENDENCIES=2

 1.e-10,,0.,0.,0.
 0.18,,200.,0.,0.
 1.e-10,,0.,2.,0.
 0.22,,200.,2.,0.
 1.e-10,,0.,0.,2.
 0.26,,200.,0.,2.
 1.e-10,,0.,2.,2.
 0.30,,200.,2.,2.
*MASS,ELSET=MASS_ELEMENTS
 0.02588, 
**
*AMPLITUDE,NAME=STEPPED
 0.,1.,100.,1.
*INITIAL CONDITIONS,TYPE=TEMPERATURE
 NALL,0.
*INITIAL CONDITIONS,TYPE=FIELD,VARIABLE=1
 NALL,0.
*INITIAL CONDITIONS,TYPE=FIELD,VARIABLE=2
 NALL,0.
**
****************************
** Analysis
****************************
** 
****************************
** Test Elements
** 	SPRING1,DASHPOT1
**	SPRING2,DASHPOT2
** 	SPRINGA,DASHPOTA
** under equal conditions.
** Results should match.
****************************
**
****************************
** Stretch System
****************************
** ---------------- STEP 1
**
*RESTART, WRITE
*STEP,NLGEOM
  STRETCH OUT
*STATIC
 1.E2,1.E2
*BOUNDARY
**
** First fix spring to walls and prevent the top
** spring2/A masses from moving (cfr. drawing)
** Results from this step should
** match for all three spring/dashpot systems.
**
 11,1,6,0.
 101,1,6,0.
 12,1,6,0.
 102,1,6,0.
**
** Apply a positive displacement to nodes (masses) 2, 13 and 103
**
 3,1,1,1.
 13,1,1,1.
 103,1,1,1.
 3,2,6,0.
 13,2,6,0.
 103,2,6,0.
*TEMPERATURE,AMPLITUDE=STEPPED
 NALL, 100.
*FIELD,AMPLITUDE=STEPPED,VARIABLE=1
 NALL, 1.
*FIELD,AMPLITUDE=STEPPED,VARIABLE=2
 NALL, 1.
*EL PRINT, FREQ=2,SUMMARY=NO
 S, 
 E, 
*NODE PRINT,FREQ=2,SUMMARY=NO,GLOBAL=NO
 U, 
 V, 
 A, 
 CF, 
 RF, 
*NODE FILE,NSET=NALL,FREQ=10,GLOBAL=NO
 U , V , A
*OUTPUT,FIELD,FREQ=10
*NODE OUTPUT,NSET=NALL
 U,V,A
*EL FILE,FREQUENCY=10
 S,E
*OUTPUT,FIELD,FREQ=10
*ELEMENT OUTPUT
 S,E
*OUTPUT, HISTORY
*NODE OUTPUT,NSET=NALL, GLOBAL=NO
 U,V,A
*END STEP
**
*****************************
** Release Stretched System
*****************************
**
** ---------------- STEP 2
**
*STEP,INC=200
 RELEASE
*DYNAMIC,HAFTOL=0.1
 5.E-4,.7,,0.7
*BOUNDARY,OP=NEW
**
** Removed previous BC's.  Now we add all but
** those belonging to the mass nodes, so they
** are free to move.
**
 11,1,6,0.
 101,1,6,0.
 12,1,6,0.
 102,1,6,0.
**
** let nodes (masses) 2, 13 and 103 free to move
**
 3,2,6,0.
 13,2,6,0.
 103,2,6,0.
*MONITOR,NODE=3,DOF=1
*NODE FILE,NSET=NALL,FREQ=1,GLOBAL=NO
 U,V,A
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT,NSET=NALL
 U,V,A
*EL FILE,FREQ=50
 S,E
*OUTPUT,FIELD,FREQ=50
*ELEMENT OUTPUT
 S,E
*OUTPUT, HISTORY
*NODE OUTPUT,NSET=NALL, GLOBAL=NO
 U,V,A
*END STEP