『求助』结构非线性分析求助

小弟刚开始学结构非线性分析，选用solid65和link8单元，模拟钢筋混凝土结构。在求解过程中，当结构受力到达屈服时，就出现提示Solution not converged at time 14.414088. Closed step 1 substep11. Run terminated.即约束条件不收敛(已设定了单元的塑性条件)，请问如何解决？以下附上命令流，希望高手多多指点，先谢谢了。
/units,si
/com,structural
/prep7
et,1,link8
et,2,solid65
keyopt,2,7,1
r,1,78.5
r,2
mp,ex,1,2.1e5
mp,prxy,1,0.3
mp,dens,1,7.8e-6
mp,ex,2,3e4
mp,prxy,2,0.3
mp,dens,2,2.5e-6
tb,bkin,1
tbdata,1,420,0
tb,concr,2
tbdata,,0.9,1,1.75,17.5
SAVE
blc4,,,1594,4018,30000
/view,1,1,1,1
/ang,1
vplot
kwpave,5
wpoff,797
wprot,0,0,90
vsbw,1
wpoff,0,2805
wprot,0,90
vsbw,all
wpoff,5000
wprot,0,0,90
vsbw,all
wpoff,0,0,20000
vsbw,all
wpstyl
nummrg,all
numcmp,all
lsel,s,,,41,57,16
lsel,a,,,9
latt,1,1,1
lesize,9,,,13,,,,,1
lesize,41,,,13,,,,,1
lesize,57,,,50,,,,,1
lmesh,all
allsel,all
vsel,s,,,all
vatt,2,2,2
lesize,22,,,7,,,,,0
lesize,23,,,2,,,,,0
lesize,33,,,2,,,,,0
lesize,28,,,3,,,,,0
mshape,0,3d
mshkey,1
vmesh,all
finish
/solu
asel,s,,,3,15,12
asel,a,,,19,23,4
da,all,all
asel,s,,,21,27,6
asel,a,,,42,46,4
asel,a,,,35,51,16
sfa,all,1,pres,9.04e-3
allsel,all
cnvtol,f,,0.05,2
nsubst,25
outres,all,all
autots,1
lnsrch,1
ncnv,2
neqit,50
pred,on
time,20
solve
finish