结构振动响应问题
请教一下各位老师，我使用如下命令流，施加载荷为0，但是结构还是有位移响应，请问为什么会出现这样的情况，基础不是太好FINISH/CLEAR,NOSTART/PREP7
ET,1,BEAM188
MPTEMP,1,0 !BEAM
MPDATA,EX,1,,2.06e11
MPDATA,PRXY,1,,0.3
MPDATA,DENS,1,,7846
SECTYPE,101,beam,I !!!!H1500A
SECDATA,0.65,0.65,1.5,0.05,0.05,0.032
SECOFFSET,user,0,0.75
N,1,1,0,0
NGEN,9,1,1,,,1
TYPE,1
SECNUM,101
E,1,2
EGEN,8,1,-1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!施加约束
nsel,s,,,1,9,8
CM,NN,NODE
D,NN,ALL
ALLS
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!施加位移边界条件
ACEL,,,9.8
ALLS
C****求解
!瞬态分析
/SOLU
ANTYPE,TRANS
TRNOPT,FULL
SOLCONTROL,ON
LNSRCH,ON
PRED,ON
KBC,1
!NLGEOM,1
ALPHAD,2.04
betad,0.00039
T0=0.1E-10
*DO,t,T0,10,0.1
TIME,t
f=50
F,5,FZ,0
ALLS
OUTRES,basic,ALL
SOLVE
*ENDDO
FINISH
本帖最后由 htbbzzg 于 2014-12-17 15:43 编辑
1 可能是数值误差造成的。你去掉：
F, 5, FZ, 0
这一句试试。2 最好把 acel,9.8 也去掉试试。
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