!
要點：預應力，特徵值屈曲，新增初始缺陷，幾何非線性分析
finish
/clear
/units,si
/prep7
!* force=100
offset=0.1 !初始缺陷為 0.1
! 建立模型
et,1,beam4
et,2,link10
r,1,0.1*0.12,0.12*0.1**3/12,0.1*0.12**3/12,0.12,0.1, ,
r,2,0.002*0.002,2e-3, !預應力
mptemp,1,0
mpdata,ex,1,,200e9
mpdata,prxy,1,,0.27
mpdata,dens,1,,7800
k,1,
k,2,0,0,5
k,3,0,0,-5
k,11,0.2,0,0
k,12,-0.2,0,0
k,13,0,0.2
k,15,0,-0.2
l,1,2
l,1,3
l,1,11
l,1,12
l,1,13
l,1,15 270
l,2,11
l,2,12
l,2,13
l,2,15
l,3,11
l,3,12
l,3,13
l,3,15
lsel,,,,1,6
latt,1,1,1
allsel,all
lsel,,,,7,14
latt,1,2,2
allsel,all
lsel,,,,1,6
lesize,all,0.3, , , , , , ,1
lsel,,,,7,14
lesize,all, , ,1 , , , , ,1
allsel,all
lmesh,all
finish
/eshape,1.0
!* ! 求解特徵值屈曲荷載
*do,i,1,100
finish
/solu
dk,3, , , ,0,ux,uy,uz, , ,rotz ,
dk,2, , , ,0,ux,uy, , , , ,
fk,2,fz,-force
antype,0
!設定時間步
time,1
autots,0
nsubst,1, , ,1
!nlgeom,1
sstif,on
solve
finish
/solu
antype,buckle ! buckling analysis 271
bucopt,lanb,1 ! use block lanczos solution method, extract 1 mode
mxpand,1 ! expand 1 mode shape
pstres,on ! include prestress effects
solve
finish
*get,freq1,mode,1,freq
*if,freq1,lt,0.01,then
freq1=0.01
*endif
*if,abs(freq1-1),lt,0.01,then !如果頻率誤差小於 1%
*exit
*endif
force=force*freq1
*enddo
! 新增初始缺陷
finish
/post1
set,first
nsort,u,sum
*get,dmax,sort, ,max
!* finish
/prep7
upgeom,offset/dmax,1,1,beammodel,rst
! 非線性求解
finish
/solu
!* force=force*3.
dk,3, , , ,0,ux,uy,uz, , ,rotz ,
dk,2, , , ,0,ux,uy, , , , ,
fk,2,fz,-force
antype,0
nlgeom,1
nsubst,20,0,0
outres,all,1
arclen,1,0,0
autots,-1.0
solve 272
! 繪製荷載位移曲線
finish
/post26
file
file,'beammodel','rst','.'
/ui,coll,1
numvar,200
filldata,191,,,,1,1
realvar,191,191
numvar,200
filldata,191,,,,1,1
realvar,191,191
!* nsol,2,2,u,z, uz_2
store,merge
!* rforce,3,19,f,z, fz_3
store,merge
xvar,2
plvar,3,
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