昨天做一个矩形框架的特征值屈曲分析,采用beam189单元,扩展5阶屈曲模态,查看结果发现5个是一样的,和理论解相去甚远,原因何在?
把命令流也附上:
fini
/clear
/filname,wending
/title,dancengkuangjia
/prep7
et,1,beam189
mp,ex,1,206e3
mp,prxy,1,0.3
sectype,1,beam,i
secdata,600,600,600,12,12,14
secplot,1
sectype,2,beam,i
secdata,600,600,600,14,14,16
secplot,2
k,1
k,2,6000
k,3,6000,6000
k,4,,6000
k,101,6000,,6000
k,102,,6000,6000
!dk,1,ux,,,,uy,uz
!dk,2,ux,,,,uy,uz
!dk,1,rotx
!dk,2,rotx
l,1,2
l,2,3
l,3,4
l,4,1
lesize,1,,,20
latt,1,,1,,101,,1
lmesh,1
lesize,2,,,20
latt,1,,1,,101,,2
lmesh,2
lesize,3,,,20
latt,1,,1,,102,,1
lmesh,3
lesize,4,,,20
latt,1,,1,,102,,2
lmesh,4
/solu
dianh1=node(0,0,0)
dianh2=node(6000,0,0)
d,dianh1,ux,,,,,uy,uz,rotx
d,dianh2,uy,,,,,uz,rotx
fk,3,fy,-1
fk,4,fy,-1
pstres,on
allsel,all
solve
fini
/solu
antype,buckle
bucopt,lanb,5
mxpand,5
outres,all,all
solve
fini
/post1
set,list |