beam44与shell63铰接求助

现在同一位置设置不同的节点然后耦合x y z平动自由度
命令流如下：
finish
/clear
/prep7
k,1,1,1,1
k,2,1,0,1
k,3,0,1,1
k,4,,,1
k,5,1,1
k,6,1,0
k,7,0,1
k,8,
k,9,1,1,1
k,10,1,0,1
k,11,0,1,1
k,12,,,1
et,1,shell63
et,2,beam44
r,1,0.5
mp,ex,1,2.1E11
mp,prxy,1,0.25
sectype,1,beam,rect
secdata,0.2,0.3
l,9,5
l,10,6
l,11,7
l,12,8
latt,1,,2,,,,1
a,4,3,1,2
aatt,1,1,1
mshape,0
mshkey,1
amesh,all
lmesh,all
cpintf,ux,0.01!耦合重合节点自由度
cpintf,uy,0.01
cpintf,uz,0.01
/sol           
dk,5,all
dk,6,all
dk,7,all
dk,8,all
f,14,fx,2
solve
/post1
pldisp,1
prrsol
如果把fx加大就会提示位移超过极限
fx=2时 梁的变形图怎么会变成这样啊！！好像耦合自由度的那个梁单元扭转自由度都释放掉了！
求高手指点下啊！找了好久都没有找出错误啊！