土木工程实用参考

chenxin360

土木工程实用参考 !ex9.17 有预应力时梁上移动荷载的瞬态分析
finish
/clear
/config,nres,4000
/prep7
p=10000  !荷载值
v=18*1e3/3600 !移动速度18km/h
deltl=lb/ne
deltt=deltl/v  !移动一个单元所需时间

em=2.1e11
area=0.2
im=0.006
deng=7800
gra=9.8


et,1,beam3
mp,ex,1,em
mp,nuxy,1,0.2
mp,dens,1,deng
r,1,area,im,1.0

*do,i,1,nn
n,i,(i-1)*deltl
*enddo
*do,i,1,ne
e,i,i+1
*enddo
d,1,ux,,,,,uy
d,nn,uy
finish
/solu
antype,trans
!静力分析
sstif,on
timint,off
time,1e-5
acel,,gra

f,node(5,0,0),fy,-20e3
f,node(10,0,0),fy,-60e3
f,node(15,0,0),fy,-30e3

nsubst,2
kbc,1
lswrite,1
!瞬态分析
timint,on
outres,all,all
deltim,deltt/10
kbc,1
autots,on

time,1*deltt
f,1,fy,-p
lswrite,2


*do,i,2,nn
time,i*deltt
*get,pi1,node,i-1,f,fy
*get,pi,node,i,f,fy
f,i-1,fy,pi1+p
f,i,fy,pi-p
lswrite,i+1
*enddo
!荷载移出后的瞬态分析
fdele,nn,all
time,lb/v+1.0
lswrite,nn+2

lssolve,1,nn+2

finish
/post26
nc=node(lb/2,0,0)
nsol,2,nc,u,y
plvar,2

esol,3,50,51,m,z
plvar,3