how to model 3-point-bending test on Ansys APDL?

[aizatul_ain]

hello and good day,
I would like to know how to positioned the constrain correctly on 3-point bending test on Ansys APDL. in order to mimic exactly the 3 point bending the i have to constrain the bottom end of my model. but Ansys keeps selecting automatically the middle line instead.

And what is the exactly constrains that I should apply. I have tried to constrain all DOF for both ends and partially constrain in Ux& Uy at first end and Uy for second end. unfortunately, both gives me absurd result in terms of displacement vector sum.

my model is in 3D.

can someone suggest more correct technique to done it? below i attach my Ansys code for bendng test.

Thank you.

RESUME,'cfrpgfrpproperties','db','D:/New folder/MODEL CASE'
/COM,ANSYS RELEASE 15.0.7 UP20140420 09:54:17 09/08/2017
/REPLOT,RESIZE
K,1,0,0,0,
K,2,40,0,0,
K,3,40,0,15,
K,4,0,0,15,
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
LSTR, 4, 3
LSTR, 3, 2
LSTR, 2, 1
LSTR, 1, 4
FLST,2,4,4
FITEM,2,4
FITEM,2,3
FITEM,2,2
FITEM,2,1
AL,P51X
/VIEW,1,,,1
/ANG,1
/REP,FAST
/VIEW,1,,1
/ANG,1
/REP,FAST
FLST,2,4,4
FITEM,2,4
FITEM,2,1
FITEM,2,2
FITEM,2,3
AL,P51X
FLST,2,1,5,ORDE,1
FITEM,2,1
AESIZE,P51X,10,
FLST,2,1,5,ORDE,1
FITEM,2,1
AESIZE,P51X,10,
MSHAPE,0,2D
MSHKEY,0
!*
CM,_Y,AREA
ASEL, , , , 1
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
!*
AMESH,_Y1
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
FLST,5,37,1,ORDE,2
FITEM,5,1
FITEM,5,-37
CM,_Y,NODE
NSEL, , , ,P51X
CM,_Y1,NODE
CMSEL,S,_Y
CMDELE,_Y
!*
!*
NREFINE,_Y1, , ,5,1,1,1
CMDELE,_Y1
!*
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
/VIEW,1,,,1
/ANG,1
/REP,FAST
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
sect,1,shell,,
secdata, 0.45,1,0.0,3
secdata, 0.14,2,0.0,3
secdata, 0.14,2,0.0,3
secdata, 0.14,2,0.0,3
secdata, 0.14,2,0.0,3
secdata, 0.45,1,0.0,3
secoffset,MID
seccontrol,,,, , , ,
!*
/SHRINK,0
/ESHAPE,1.0
/EFACET,1
/RATIO,1,1,1
/CFORMAT,32,0
/REPLOT
!*
/ZOOM,1,RECT,0.951288,0.276968 ,1.63354501531 ,-0.595275563518
/AUTO,1
/REP,FAST
SAVE
FLST,2,2,4,ORDE,2
FITEM,2,2
FITEM,2,4
FLST,2,1,4,ORDE,1
FITEM,2,2
!*
/GO
DL,P51X, ,UY,
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UX,
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UY,
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UZ,
/VIEW,1,,,1
/ANG,1
/REP,FAST
/VIEW,1,,1
/ANG,1
/REP,FAST
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
/VIEW,1,,1
/ANG,1
/REP,FAST
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
/VIEW,1,,1
/ANG,1
/REP,FAST
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UX,
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UY,
FLST,2,1,4,ORDE,1
FITEM,2,2
!*
/GO
DL,P51X, ,UY,
FLST,2,37,1,ORDE,37
FITEM,2,26
FITEM,2,31
FITEM,2,36
FITEM,2,112
FITEM,2,124
FITEM,2,150
FITEM,2,-151
FITEM,2,156
FITEM,2,-157
FITEM,2,372
FITEM,2,-373
FITEM,2,380
FITEM,2,-381
FITEM,2,388
FITEM,2,-389
FITEM,2,440
FITEM,2,-441
FITEM,2,448
FITEM,2,-449
FITEM,2,456
FITEM,2,-457
FITEM,2,782
FITEM,2,784
FITEM,2,796
FITEM,2,799
FITEM,2,1394
FITEM,2,1403
FITEM,2,1408
FITEM,2,1417
FITEM,2,1424
FITEM,2,1433
FITEM,2,1532
FITEM,2,1541
FITEM,2,1548
FITEM,2,1557
FITEM,2,1564
FITEM,2,1573
!*
/GO
F,P51X,FZ,-500
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
/VIEW,1,,,-1
/ANG,1
/REP,FAST
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
/VIEW,1,,1
/ANG,1
/REP,FAST
FLST,2,56,1,ORDE,51
FITEM,2,26
FITEM,2,31
FITEM,2,36
FITEM,2,112
FITEM,2,-113
FITEM,2,123
FITEM,2,-124
FITEM,2,150
FITEM,2,-151
FITEM,2,156
FITEM,2,-157
FITEM,2,372
FITEM,2,-373
FITEM,2,380
FITEM,2,-381
FITEM,2,388
FITEM,2,-389
FITEM,2,440
FITEM,2,-441
FITEM,2,448
FITEM,2,-449
FITEM,2,456
FITEM,2,-457
FITEM,2,782
FITEM,2,784
FITEM,2,796
FITEM,2,799
FITEM,2,1394
FITEM,2,1400
FITEM,2,1402
FITEM,2,-1403
FITEM,2,1408
FITEM,2,1414
FITEM,2,1416
FITEM,2,-1418
FITEM,2,1424
FITEM,2,1430
FITEM,2,1432
FITEM,2,-1434
FITEM,2,1532
FITEM,2,1538
FITEM,2,1540
FITEM,2,-1542
FITEM,2,1548
FITEM,2,1554
FITEM,2,1556
FITEM,2,-1558
FITEM,2,1564
FITEM,2,1570
FITEM,2,1572
FITEM,2,-1574
FDELE,P51X,ALL
FLST,2,37,1,ORDE,37
FITEM,2,26
FITEM,2,31
FITEM,2,36
FITEM,2,112
FITEM,2,124
FITEM,2,150
FITEM,2,-151
FITEM,2,156
FITEM,2,-157
FITEM,2,372
FITEM,2,-373
FITEM,2,380
FITEM,2,-381
FITEM,2,388
FITEM,2,-389
FITEM,2,440
FITEM,2,-441
FITEM,2,448
FITEM,2,-449
FITEM,2,456
FITEM,2,-457
FITEM,2,782
FITEM,2,784
FITEM,2,796
FITEM,2,799
FITEM,2,1394
FITEM,2,1403
FITEM,2,1408
FITEM,2,1417
FITEM,2,1424
FITEM,2,1433
FITEM,2,1532
FITEM,2,1541
FITEM,2,1548
FITEM,2,1557
FITEM,2,1564
FITEM,2,1573
!*
/GO
F,P51X,FY,-500
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UX,
FLST,2,1,4,ORDE,1
FITEM,2,4
!*
/GO
DL,P51X, ,UY,
FLST,2,1,4,ORDE,1
FITEM,2,2
!*
/GO
DL,P51X, ,UY,
FINISH
/SOL
/STATUS,SOLU
SOLVE
FINISH
/POST1
!*
/EFACET,1
PLNSOL, U,SUM, 0,1.0
SAVE,'case1','db','D:\'
! LGWRITE,'case1','lgw','D:\',COMMENT
/REPLOT,RESIZE
/REPLOT,RESIZE