简支梁，均布荷载，弯矩图，出现错误，固端约束却可解，这是为什么？
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finish
/clear
/prep7
et,1,beam3
mp,ex,1,2.1e11
mp,prxy,1,0.3
r,1,0.007848,4.9087e-6,0.1
k,1
k,2,0，6
l,1,2
lesize,all,,,8
lmesh,all
d,1,ux,,,,uy
d,2,uy
sfbeam,all,1,pres,20000
/solu
solve
finish
/post1
pldisp,1
etable,mi,smisc,6
etable,mj,smisc,12
plls,mi,mj,-1
若将简支约束改为固端约束（如下面所示）则计算不会出现错误，这是为什么呢？求大神！！！
finish
/clear
/prep7
et,1,beam3
mp,ex,1,2.1e11
mp,prxy,1,0.3
r,1,0.007848,4.9087e-6,0.1
k,1
k,2,0，6
l,1,2
lesize,all,,,8
lmesh,all
d,1,all
d,2,all
sfbeam,all,1,pres,20000
/solu
solve
finish
/post1
pldisp,1
etable,mi,smisc,6
etable,mj,smisc,12
plls,mi,mj,-1
邹正刚 
