请教shell63与beam4的连接问题

我用这两种单元建立的桌子模型
对桌面施加面载荷时能算出结果
当施加沿着桌面的集中力时就出错了
是否是他们的连接除了问题
还是属性设置上有问题
望高手指教

/PREP7
ET,1,SHELL63
ET,2,BEAM4

KEYOPT,2,2,1
KEYOPT,2,6,1
KEYOPT,2,7,1
KEYOPT,2,9,0
KEYOPT,2,10,0

R,1,0.1, , , , , ,
RMORE, , , ,
RMORE
RMORE, ,

R,2,0.0314, , , , , ,
RMORE, , , , , , ,

MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,71000
MPDATA,PRXY,1,,0.3
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,2,,1870
MPDATA,PRXY,2,,0.3
RECTNG,0,2,0,1,
MSHKEY,0
CM,_Y,AREA
ASEL, , , , 1
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y

AMESH,_Y1

CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2

FLST,3,4,1,ORDE,4
FITEM,3,19
FITEM,3,-20
FITEM,3,27
FITEM,3,-28
KNODE,0,P51X
FLST,3,4,3,ORDE,2
FITEM,3,5
FITEM,3,-8
KGEN,2,P51X, , , , ,1, ,0
LSTR, 6, 10
/USER, 1
LSTR, 10, 6
LSTR, 9, 5
LSTR, 12, 8
LSTR, 11, 7
FLST,5,4,4,ORDE,2
FITEM,5,5
FITEM,5,-8
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y

LESIZE,_Y1, , ,1, , , , ,1

LPLOT
TYPE, 2
MAT, 2
REAL, 2
FLST,2,4,4,ORDE,2
FITEM,2,5
FITEM,2,-8
LMESH,P51X
/REPLO
NUMMRG,NODE, , , ,LOW
FLST,2,4,1,ORDE,4
FITEM,2,30
FITEM,2,35
FITEM,2,41
FITEM,2,47

/GO
D,P51X, , , , , ,ALL, , , , ,
FLST,2,1,5,ORDE,1
FITEM,2,1
/GO

SFA,P51X,1,PRES,-10
/REPLO
NPLOT
/PNUM,KP,0
/PNUM,LINE,0
/PNUM,AREA,0
/PNUM,VOLU,0
/PNUM,NODE,1
/PNUM,TABN,0
/PNUM,SVAL,0
/NUMBER,0

/PNUM,ELEM,0
/REPLOT

FINISH
/SOL
/STATUS,SOLU
SOLVE
/POST1

/EFACET,1
PLNSOL, U,SUM, 0,1.0
/VIEW, 1, -0.879044718804E-02, 0.707686302885 , 0.706472097642
/ANG, 1, -9.30750117124
/REPLO
/VIEW, 1, 0.250846641846 , 0.875289167086 , -0.413454757206
/ANG, 1, 146.276382851
/PREP7
FLST,2,1,5,ORDE,1
FITEM,2,1
SFADELE,P51X,1,PRES
FLST,2,2,1,ORDE,2
FITEM,2,17
FITEM,2,-18
/GO
FLST,2,2,1,ORDE,2
FITEM,2,17
FITEM,2,-18

/GO
F,P51X,FX,10
FINISH
/SOL
/STATUS,SOLU
SOLVE