*HEADING
[ACIN2D3, TIE]
*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES
*NODE,NSET=BEAMS,SYSTEM=C
25001, 4.0, 90.0,0.0
25071, 4.0,-90.0,0.0
**********************************
*NODE,NSET=STIFFNER
55,0.0,-2.0
65,1.0,-2.0
75,3.0,-1.1
**********************************
*NGEN,NSET=BEAMS,LINE=C
 25001,25071,1,,0,0,0,0,0,-1
*NSET,NSET=OUT
 25001, 25071, 25036,75
*NSET,NSET=P_OUT
1,21,41,1001,1021,1041 
**********************************
*NODE,NSET=INNER
1, 0, 4,0,  0, 1,0
41,0,-4,0,  0,-1,0
*NGEN,NSET=ACOUSTIC,LINE=C
1,41,1,,0,0,0,0,0,-1
**********************************
*ELEMENT,TYPE=B21,ELSET=BEAMS
2001, 25001,25002
*ELGEN,ELSET=BEAMS
2001,70,1,1
*ELEMENT,TYPE=B21,ELSET=STIFFNER
3001,55,65
4001,65,25060
5001,75,25048
6001,75,25040
**********************************
*ELEMENT, TYPE=ACIN2D3,ELSET=ACOUSTIC
1,1,3,2
*ELGEN,ELSET=ACOUSTIC
1,20,2
**********************************
*Elset,ELSET=ACOUSTIC
1,
*SURFACE,TYPE=ELEMENT,NAME=ACOUSTIC
ACOUSTIC,SPOS
*SURFACE,TYPE=ELEMENT,NAME=MAIN
BEAMS,SPOS
*TIE,NAME=COUPLING
ACOUSTIC,MAIN
**********************************
*MATERIAL,NAME=WATER
*DENSITY
1000.0, 
*ACOUSTIC MEDIUM,BULK MODULUS
2.25E9,
*SOLID SECTION,MATERIAL=WATER,ELSET=ACOUSTIC
0.1, 0,0,0
**********************************
*BEAM SECTION,MATERIAL=MAT1,ELSET=BEAMS,SECTION=RECT
0.1,0.1
*BEAM SECTION,MATERIAL=MAT1,ELSET=STIFFNER,SECTION=RECT
0.1,0.1
*MATERIAL,NAME=MAT1
*ELASTIC
207E9,0.3
*DENSITY
7800
**********************************
*STEP,INC=1000
*STEADY STATE DYNAMIC,DIRECT
1.0,7.0,2,1
*CLOAD
55,2,100.0
*BOUNDARY
25001,1,1,0.0
25071,1,1,0.0
25001,6,6,0.0
25071,6,6,0.0
55,1,1,0.0
55,6,6,0.0
*NODE PRINT,FREQ=1,NSET=BEAMS
U,V,A
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT,NSET=BEAMS
U,
*NODE OUTPUT,NSET=ACOUSTIC
POR
*OUTPUT,HISTORY,FREQ=1
*NODE OUTPUT,NSET=BEAMS
U,V,A
*NODE OUTPUT,NSET=ACOUSTIC
POR,
*END STEP