复杂结构分析

england_rose

较复杂结构的分析结果会不会出现不稳定的现象？求高手指点

2006shaqiang

有多复杂?
哪种分析?
怎么个不稳定?

liudapengsnd

/PREP7
/TITLE, BUCKLING OF A BAR WITH HINGED SOLVES
ET,1,BEAM3                ! Beam element
R,1,.25,52083E-7,.5       ! Area,IZZ, height
MP,EX,1,30E6              ! Define material properties
N,1
N,11,,100
FILL
E,1,2
EGEN,10,1,1
FINISH

/SOLU
ANTYPE,STATIC             ! Static analysis
PSTRES,ON                 ! Calculate prestress effects
D,1,ALL                   ! Fix symmetry ends
F,11,FY,-1                ! Unit load at free end
SOLVE
FINISH

/SOLU
ANTYPE,BUCKLE             ! Buckling analysis
BUCOPT,LANB,1             ! Use Block Lanczos solution method, extract 1 mode
MXPAND,1                  ! Expand 1 mode shape
SOLVE
FINISH
/POST1
SET,FIRST
PLDISP,1
FINISH