非线性载荷步怎么加？？

anan1986

请教高手
基坑开外分析APDL如下：
前两个载荷步可以运算，第三个载荷步就不对了，现在知道是多了/solu的问题，在第三载荷步需要后处理/post1在计算就出问题，怎样实现把后处理/post1或前处理/prep7嵌套进载荷步
/prep7

et,1,plane42,,,1

mp,ex,1,2.675e9     !土的材料特性
mp,nuxy,1,0.3375
mp,dens,1,1000

mp,ex,2,2.85e10     !混凝土的材料特性
mp,nuxy,2,0.17
mp,dens,2,2548

rectng,0,7.5,0,4
rectng,0,7.5,4,4+11/3
rectng,0,7.5,4+11/3,4+11*2/3
rectng,0,7.5,4+11*2/3,15
rectng,4,4.5,0,15
aptn,all

lsel,s,loc,x,2
lesize,all,,,4,,,,1
lsel,s,loc,x,4.25
lesize,all,,,2,,,,1
lsel,s,loc,x,6
lesize,all,,,3,,,,1

lsel,s,loc,x,0
lsel,a,loc,x,4
lsel,a,loc,x,4.5
lsel,a,loc,x,7.5
lesize,all,,,3,,,,1

alls
mshape,0,1d
mshkey,1
amesh,all

finish

/solu
antype,0       ! 静力分析
nlgeom,on      !打开大变形
nropt,full     !设置牛顿选项
outers,all,all !写入到数据库中的数据
time,1

lsel,s,loc,y,0
dl,all,,uy

sfgrad,pres,0,y,15,-3e4
lsel,s,loc,x,7.5
sfl,all,pres,0

acel,0,9.8,0

allsel,all
sbctran

solve

asel,s,,,9
asel,a,,,15
allsel,below,area
cm,death1,elem
ekill,all
allsel,all

time,2
solve

/solu

asel,s,,,9
allsel,below,area
mpchg,2,all
cm,birth1,elem
ealive,all
allsel,all

time,3
solve