请问beam188单元的应变结果全是0呢？

这是我的命令流，最后提出的轴向应变EX全是0，求助大侠们是怎么回事啊?
finish
/clear,start
/filname,aaaaa
/prep7
K,1
K,2,15,0,0
L,1,2
et,1,beam189
sectype,1,beam,I
secdata,0.1031,0.1031,0.1057,0.00876,0.00876,0.00711
keyopt,1,6,3
keyopt,1,7,2
keyopt,1,8,3
keyopt,1,9,3
mp,ex,1,210e9
mp,prxy,1,0.25

ESIZE,,60
LMESH,ALL
alls
nsel,s,loc,x,3.75
d,all,uy
alls
nsel,s,loc,x,11.25
d,all,uy
alls
f,1,fy,-462.62
f,2,fy,-462.62
/solu
antype,0
alls
solve
outres,all,all
/post1
alls
ETABLE,strain,SMISC,7
pretab,strain