*HEADING
BEAM WITH BOX CROSS SECTION LOADED AXIALLY
*PREPRINT
*NODE,NSET=NALL
1,-10.,0.
2, 10.,0.
*ELEMENT,TYPE=B21,ELSET=EL
1,1,2
*BEAM SECTION, MATERIAL=ELASTIC,SECTION=BOX,ELSET=EL
1.0,1.0,0.2,0.2,0.1,0.1
*MATERIAL, NAME=ELASTIC
*ELASTIC,TYPE=ISOTROPIC
2.0E11,0.3
*DENSITY
7.8E3, 
*AMPLITUDE,NAME=SMOOTH,DEFINITION=SMOOTH STEP
0.0,0.0,0.2,1.0
*NSET, NSET=QA_TEST_ALLNODES
NALL,
*STEP
*DYNAMIC,EXPLICIT
 ,0.2
*BULK VISCOSITY
0., 
*BOUNDARY,AMPLITUDE=SMOOTH
 1,1,1,-0.01
 2,1,1, 0.01
 NALL,2,2
 NALL,6,6
*MONITOR,DOF=1,NODE=1
***OUTPUT,HISTORY,TIME INTERVAL=0.
***NODE OUTPUT,NSET=NALL
**U,
***ELEMENT OUTPUT,ELSET=EL
**SE,SF,ERV
***ENERGY OUTPUT
**ALLIE,ALLWK,ALLVD,ETOTAL,ALLKE,DT
*FILE OUTPUT, NUMBER=4,TIMEMARKS=YES
*NODE FILE
U,
*ENERGY FILE
*OUTPUT, FIELD, NUMBER INTERVAL=4, TIMEMARKS=YES
*NODE OUTPUT, NSET=QA_TEST_ALLNODES
U,
*OUTPUT,HISTORY,TIME INTERVAL=0.2
*ENERGY OUTPUT, VAR=ALL
*END STEP
*STEP
*DYNAMIC,EXPLICIT,FIXED
 ,0.1
*BOUNDARY,OP=NEW
 NALL,2,2
 NALL,6,6
*MONITOR,DOF=1,NODE=1
*END STEP
*STEP
*DYNAMIC,EXPLICIT
 ,0.2
**
** Return BULK VISCOSITY to default value
**
*BULK VISCOSITY
 0.06, 
*MONITOR,DOF=1,NODE=1
*END STEP