这是我的命令流，荷载位移曲线是直线呢，高手指点迷津啊，谢谢！
fini
/clear
/PREP7
!------------------------
PI=3.1415926             定义实常数
E=2.06e+8
!--------------------------
N,1,1.6180,-1.8090,0.0000
N,2,1.6180,1.8090,0.0000
N,3,0.0000,-2.4271,0.0000
N,4,-1.6180,-1.8090,0.0000
N,5,0.0000,2.4271,0.0000
N,6,-1.6180,1.8090,0.0000
N,7,1.8090,0.5000,-1.6180
N,8,1.0000,0.8090,-2.1180
N,9,0.5000,0.0000,-2.4271
N,10,1.0000,-0.8090,-2.1180
N,11,1.8090,-0.5000,-1.6180
N,12,-1.8090,0.5000,-1.6180
N,13,-1.0000,0.8090,-2.1180
N,14,-0.5000,0.0000,-2.4271
N,15,-1.0000,-0.8090,-2.1180
N,16,-1.8090,-0.5000,-1.6180
N,17,-1.6180,1.8090,-0.5000
N,18,0.5000,1.6180,-1.8090
N,19,-0.5000,1.6180,-1.8090
N,20,2.1180,1.0000,-0.8090
N,21,0.8090,2.1180,-1.0000
N,22,1.6180,1.8090,-0.5000
N,23,-0.8090,2.1180,-1.0000
N,24,0.5000,-1.6180,-1.8090
N,25,-0.5000,-1.6180,-1.8090
N,26,2.4271,0.5000,0.0000
N,27,2.4271,-0.5000,0.0000
N,28,2.1180,-1.0000,-0.8090
N,29,0.0000,2.4271,-0.5000
N,30,-2.1180,1.0000,-0.8090
N,31,-2.4271,0.5000,0.0000
N,32,-2.4271,-0.5000,0.0000
N,33,0.8090,-2.1180,-1.0000
N,34,1.6180,-1.8090,-0.5000
N,35,-2.1180,-1.0000,-0.8090
N,36,-1.6180,-1.8090,-0.5000
N,37,-0.8090,-2.1180,-1.0000
N,38,0.0000,-2.4271,-0.5000
N,39,0,0,5
!!==============================
ET,1,BEAM188
MP,EX,1,2.060e+008
MP,PRXY,1,0.3
!MP,DENS,1,7.96
!-------------------------
t1=0.003
RO1=0.03
RI1=RO1-t1
t2=0.003
RO2=0.03
RI2=RO2-t2
t3=0.003
RO3=0.03
RI3=RO3-t3
t4=0.003
RO4=0.03
RI4=RO4-t4
t5=0.003
RO5=0.03
RI5=RO5-t5
t6=0.003
RO6=0.03
RI6=RO6-t6
t7=0.003
RO7=0.03
RI7=RO7-t7
t8=0.003
RO8=0.03
RI8=RO8-t8
!-------------------------
SECTYPE,1,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI1,RO1
SECTYPE,2,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI2,RO2
SECTYPE,3,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI3,RO3
SECTYPE,4,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI4,RO4
SECTYPE,5,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI5,RO5
SECTYPE,6,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI6,RO6
SECTYPE,7,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI7,RO7
SECTYPE,8,BEAM,CTUBE
SECOFFSET,CENT
SECDATA,RI8,RO8
!==============================
TYPE,1
MAT,1
REAL,
ESYS,0
TSHAP,LINE
!!------------------------------
SECNUM,1
E,14,9,39   !1
SECNUM,2
E,14,13,39  !2
E,14,15,39  !3
E,9,8,39    !4
E,9,10,39   !5
SECNUM,3
E,13,19,39  !6
E,13,12,39  !7
E,15,16,39  !8
E,15,25,39  !9
E,10,11,39  !10
E,10,24,39  !11
E,8,7,39    !10
E,8,18,39   !11
SECNUM,4
E,12,16,39  !12
E,25,24,39  !13
E,11,7,39   !14
E,19,18,39  !15
SECNUM,5
E,19,23,39  !16
E,12,30,39  !17
E,16,35,39  !18
E,25,37,39  !19
E,24,33,39  !20
E,11,28,39  !21
E,7,20,39   !22
E,18,21,39  !23
SECNUM,6
E,23,17,39  !24
E,23,29,39  !25
E,21,29,39  !26
E,21,22,39  !27
E,20,22,39  !28
E,20,26,39  !29
E,28,27,39  !30
E,28,34,39  !31
E,33,34,39  !32
E,33,38,39  !33
E,37,38,39  !34
E,37,36,39  !35
E,35,36,39  !36
E,35,32,39  !37
E,30,31,39  !38
E,30,17,39  !39
SECNUM,7
E,17,6,39   !40
E,29,5,39   !41
E,22,2,39   !42
E,34,1,39   !43
E,38,3,39   !44
E,36,4,39   !45
SECNUM,8
E,1,3,39    !46
E,3,4,39    !47
E,4,32,39   !48
E,32,31,39  !49
E,31,6,39   !50
E,6,5,39    !51
E,5,2,39    !52
E,2,26,39   !53
E,26,27,39  !54
E,27,1,39   !55
!!------------------------------
!!!----------------------------
D,1, , , , , ,ALL,,,
D,3, , , , , ,ALL,,,
D,4, , , , , ,ALL,,,
D,32, , , , , ,ALL,,,
D,31, , , , , ,ALL,,,
D,6, , , , , ,ALL,,,
D,5, , , , , ,ALL,,,
D,2, , , , , ,ALL,,,
D,26, , , , , ,ALL,,,
D,27, , , , , ,ALL,,,
!!-------------------------
!!--------------------------
F,1,FZ,1.256393e-001
F,2,FZ,1.256396e-001
F,3,FZ,1.470571e-001
F,4,FZ,1.256396e-001
F,5,FZ,1.470578e-001
F,6,FZ,1.256395e-001
F,7,FZ,4.574238e-001
F,8,FZ,4.350805e-001
F,9,FZ,3.544805e-001
F,10,FZ,4.350805e-001
F,11,FZ,5.722184e-001
F,12,FZ,7.100061e-001
F,13,FZ,5.650817e-001
F,14,FZ,3.838690e-001
F,15,FZ,6.675910e-001
F,16,FZ,7.345565e-001
F,17,FZ,4.123801e-001
F,18,FZ,5.457653e-001
F,19,FZ,6.212442e-001
F,20,FZ,4.068081e-001
F,21,FZ,4.658767e-001
F,22,FZ,3.076273e-001
F,23,FZ,5.502115e-001
F,24,FZ,6.171053e-001
F,25,FZ,7.522409e-001
F,26,FZ,2.273936e-001
F,27,FZ,2.273932e-001
F,28,FZ,4.068083e-001
F,29,FZ,3.032162e-001
F,30,FZ,6.209254e-001
F,31,FZ,3.265440e-001
F,32,FZ,3.265451e-001
F,33,FZ,5.028820e-001
F,34,FZ,5.722184e-001
F,35,FZ,5.722184e-001
F,36,FZ,3.666727e-001
F,37,FZ,5.540215e-001
F,38,FZ,3.080420e-001
!!------------------------
!!-------------------------静力求解
ALLSEL
/SOLU   
pstres,on
solve
finish
!!-----------------模态分析
/solu
antype,1
bucopt,SUBSP,3
mxpand,3,,,3  
solve
finish  
!!------------------------
solu
NSEL,ALl
DOFSEL,S,FZ  
FSCALE,400   
DOFSEL,ALL
antype,0
nlgeom,1
outres,all,all
nsubst,3000
arclen,1
arctrm,u,0.0125,,uz
!UPCOORD,0.001,on
solve
finish
SAVE
!!------------------------
/post26
/AXLAB,X, DISPLACEMENT
/AXLAB,Y,END FORCE
nsol,2,14,u,z,dduz   
prod,3,2,,,,,,1,1,1   
prod,4,1,,,,,,1   
!prod,4,1,,,,,,400   
xvar,3
plvar,4