如何进行特征值分析柱的屈曲问题，分析结果与于非线性分析的结果有什么差别

笑盈盈

如题  如何在命令流中定义特征值屈曲，这个分析结果与非线性分析的结果有何差异

zyq309

这里有个脚手架屈曲分析的帖子，去看看吧！虽然现在的命令流还有些问题，看看也不错。

笑盈盈

我看过了 但是我想知道的东西还是没有解决 。等待答案中。

sxman

建议你看看材料力学，结构设计原理。

笑盈盈

谢谢  但是ansys 设置方面还是有些问题解决不了  。

笑盈盈

这个是命令流  一直不知道哪里不对，柱高较高时要比非线性分析时小  柱子高度较小时承载力就会很大变得不正常了
/clear,nostart
/filename,tort
/title,1
/prep7
et,1,shell181
et,2,mass21
r,1,3
r,2           
mp,ex,1,2.06e5
mp,prxy,1,0.3


!!!!!jiedian!!!!!
k,1,0,8   !jiedian zuobiao (x,y)
k,2,0,0
k,3,-40,0
k,4,-40,10
k,5,-40,20
k,6,-40,55
k,7,-40,65
k,8,-40,75
k,9,0,75
k,10,0,67
l,1,2
l,2,3
l,3,4
l,5,6
l,7,8
l,8,9
l,9,10
larc,5,4,1,5.0   !yuanhulianjie
larc,6,7,1,5.0
lfillt,1,2,2.5   !daojiao
lfillt,2,3,2.5
lfillt,5,6,2.5
lfillt,6,7,2.5
k,1000,0,0,0      !lashen
k,1001,0,0,3000    !zhugao
k,1002,0,75/2,0
k,1003,0,75/2,3000
l,1000,1001
adrag,1,10,2,11,3,8,14
adrag,4,9,5,12,6,13,14
adrag,7,,,,,,14
arsym,x,all,,,10000,1,0   !jingxiang
adele,14,,,1
adele,26,,,1
!k,1002,-40,0,4000
!k,1003,-40,70,4000
!k,1004,0,70,4000
!k,1005,40,70,4000
!k,1006,40,0,4000
!a,1001,1002,1003,1004,1005,1006
!!!!!!!!fendanyuan
type,1
mat,1
real,1
lsel,s,length,,2000,3000,1000,0  !zhugao
lesize,all,50,,,,,,,1
allsel
lsel,s,length,,30,35,5,0
lesize,all,3,,,,,,,1
allsel
lsel,s,length,,5.5,7.5,2,0
lesize,all,,,1,,,,,1
allsel
lsel,s,radius,,2.5,,,0
lesize,all,,,1,,,,,1
allsel
lsel,s,radius,,5,,,0
lesize,all,,,2,,,,,1
mshkey,1
!allsel
!asel,u,area,,14
amesh,all,,

NUMMRG,all,,,,low
NUMCMP,all


katt,1,2,2,0
kmesh,34,35,1
nsel,all
NSEL,S,LOC,Z,0
!NSEL,u,NODE,,NODE(0,37.5,0)
CERIG,NODE(0,37.5,0) ,ALL,ALL

nsel,all
NSEL,S,LOC,Z,3000
!NSEL,U,NODE,,NODE(0,37.5,3000)
CERIG,NODE(0,75/2,3000),ALL,ALL

NUMMRG,all,,,,low
NUMCMP,all

!!!!!!!!!!!!!!!jiazai
/solu
nsel,all
d,NODE(0,75/2,0) ,all,0
d,NODE(0,75/2,3000) ,ux,0
d,NODE(0,75/2,3000) ,uy,0
d,NODE(0,75/2,3000) ,rotx,0
d,NODE(0,75/2,3000) ,roty,0
d,NODE(0,75/2,3000) ,rotz,0

ANTYPE,static
PSTRES,ON



allsel,all,node
f,NODE(0,75/2,3000),fz,-1
ftran
allsel
/PBC,ALL,,1        ! 显示边界条件(2还表示数值)
EPLOT
SOLVE   
FINISH

!!!!!!!qiujie
/solu
antype,buckle
bucopt,lanb,1,0,0
mxpand,1,0,0,1,0.001
solve
finish