*HEADING
Pre-tension Section Test []
Procedures Tested: Static, Dynamic
Elements Tested: B31
**
*NODE,NSET=NALL
1,0.
2,1.
3,2
*NODE
1001,0.
*ELEMENT,TYPE=B31,ELSET=EBEAM
1,1,2
2,2,3
*BEAM SECTION,ELSET=EBEAM,SECTION=CIRC,MATERIAL=MAT
0.03, 
*MATERIAL,NAME=MAT
*ELASTIC
1.E5,0.3
*DENSITY
100., 
**
** Pre-tension Section
**
*PRE-TENSION SECTION,ELEMENT=1,NODE=1001
**
** Analysis
**
*STEP
pre-tension section by tightening
*STATIC
*BOUNDARY
1,ENCASTRE
NALL,3,5
3,1,,
** Tighten section node
1001,1,,0.1
*NODE FILE
U,RF
*EL FILE
S,E
*ENDSTEP
*STEP
add further load
*STATIC
*BOUNDARY
3,1,,0.1
*ENDSTEP
*STEP,INC=20
release
*DYNAMIC
0.005,0.1
*BOUNDARY,OP=NEW
1,ENCASTRE
1001,1,,0.1
*NSET,NSET=NOUT
3,1001
*NODE FILE,NSET=NOUT
U,RF
*EL FILE
S,E
*ENERGY FILE
*ENDSTEP