施威德勒型球面网壳的建模过程详解

施威德勒型球面网壳的建模过程详解

1、问题描述：一球面半径20.0m，跨度35m，矢跨比1:3.5的单层球面网壳。网桥结构所有杆件均采用Φ114.0×4.0的Φ235钢管。建模过程中所有数据单位统一为N-mm制。

模型侧视图

模型俯视图

模型轴测图

2、此问题拟采用ANSYS建模和受力分析。

3、施威德勒型球面网壳建模及分析命令流。! 结构建模

finish

/clear

/filename,schwedler

/title,analysis of spherical reticulated-shell

/prep7

et,1,beam4

r,1,1382,2093500,2093500,114,114,, rmore,,4187000,,,,,

mp,dens,1,7.85e-9

mp,ex,1,2.06e5

mp,nuxy,1,0.3

local,11,2,0,0,0

cscir,11,1

n,1,20000,0,30

n,10,20000,180,30

n,18,20000,340,30

fill,1,10

fill,10,18

ngen,6,18,1,18,1,0,0,10

n,109,20000,0,90

*do,i,1,91,18

e,i,i+1

egen,17,1,i,i,1

e,i+17,i

*enddo

e,1,19

egen,5,18,109,109,1

egen,18,1,109,113,1

*do,i,91,108,1

e,i,109

*enddo

*do,i,1,73,18

e,i,i+19

*enddo

egen,17,1,217,221,1

*do,i,18,90,18

e,i,i+1

*enddo

csys,0

nsel,s,loc,z,9900,10100

d,all,,,,,,ux,uy,uz,,

! 网壳结构的固有振动特性分析/sol

antype,modal

modopt,lanb,6

modopt,lanb,6,0,0,,off

solve

finish

/post1

set,list

set,first

pldisp,0

anmode,10,0.5,,0

set,next

pldisp,0

anmode,10,0.5,,0

set,next

pldisp,0

anmode,10,0.5,,0

set,next

pldisp,0

anmode,10,0.5,,0

set,next

pldisp,0

anmode,10,0.5,,0

set,next

pldisp,0

anmode,10,0.5,,0

finish

！特征值屈曲分析

nsel,all

f,all,fz,-1.00

/solu

antype,0

eqslv,spar

pstres,on

solve

finish

/solu

antype,1

bucopt,lanb,6,0,0

maxpand,6,0,0,1,0.001,

solve

finish

/post1

set,first

pldisp,2

set,next

pldisp,2

set,next

pldisp,2

set,next

pldisp,2

set,next

pldisp,2

set,next

pldisp,2

finish

! 考虑初始缺陷的非线性屈曲分析

/prep7

tb,biso,1,1,2,

tbtemp,0

tbdata,,2.0e8,0,,,,

upgeom,35,1,1,schwedler,rst,

finish

/sol

antype,0

nlgeom,1

outres,all,all

arclen,1,0,0,

arctrm,u,100,109,uz

nsubst,200,,,1

solve

finish

/post26

nsol,2,109,u,z,deflection

rforce,3,1,f,z,reactionf

/axlab,x,deflection

/axlab,y,reactionf

xvar,2

plvar,3

Finish

4、可视化后处理及分析结果显示。

I:网壳结构的固有振动特性分析

网壳的前六阶固有频率

网壳结构的第一阶振动模态

网壳结构的第二阶振动模态

网壳结构的第三阶振动模态

网壳结构的第四阶振动模态

网壳结构的第五阶振动模态

网壳的第六阶振动模态