中华钢结构论坛 China Structure Forum

标题: 求助：拉索振动仿真 [打印本页]

作者: caohong 时间: 2005-7-28 15:27 标题: 求助：拉索振动仿真

我想用ansys模拟斜拉桥拉索在简谐荷载激励下的振动问题，在拉索7＃节点上，施加一正弦荷载作用60s，然后卸掉荷载，让拉索作自由衰减振动40s。
       得到的曲线与实验实测曲线不一致？


附命令流。
!拉索瞬态动力学分析
!无阻尼器拉索瞬态动力学分析

/prep7
!生成拉索S12节点坐标
!抛物线线型


n  ,  1  ,  0  ,  0
n  ,  2  ,  2.5  ,  1.05505
n  ,  3  ,  5  ,  2.1112
n  ,  4  ,  7.5  ,  3.16845
n  ,  5  ,  10  ,  4.2268
n  ,  6  ,  12.5  ,  5.28625
n  ,  7  ,  15  ,  6.3468
n  ,  8  ,  17.5  ,  7.40845
n  ,  9  ,  20  ,  8.4712
n  ,  10  ,  22.5  ,  9.53505
n  ,  11  ,  25  ,  10.6
n  ,  12  ,  27.5  ,  11.66605
n  ,  13  ,  30  ,  12.7332
n  ,  14  ,  32.5  ,  13.80145
n  ,  15  ,  35  ,  14.8708
n  ,  16  ,  37.5  ,  15.94125
n  ,  17  ,  40  ,  17.0128
n  ,  18  ,  42.5  ,  18.08545
n  ,  19  ,  45  ,  19.1592
n  ,  20  ,  47.5  ,  20.23405
n  ,  21  ,  50  ,  21.31
n  ,  22  ,  52.5  ,  22.38705
n  ,  23  ,  55  ,  23.4652
n  ,  24  ,  57.5  ,  24.54445
n  ,  25  ,  60  ,  25.6248
n  ,  26  ,  62.5  ,  26.70625
n  ,  27  ,  65  ,  27.7888
n  ,  28  ,  67.5  ,  28.87245
n  ,  29  ,  70  ,  29.9572
n  ,  30  ,  72.5  ,  31.04305
n  ,  31  ,  75  ,  32.13
n  ,  32  ,  77.5  ,  33.21805
n  ,  33  ,  80  ,  34.3072
n  ,  34  ,  82.5  ,  35.39745
n  ,  35  ,  85  ,  36.4888
n  ,  36  ,  87.5  ,  37.58125
n  ,  37  ,  90  ,  38.6748
n  ,  38  ,  92.5  ,  39.76945
n  ,  39  ,  95  ,  40.8652
n  ,  40  ,  97.5  ,  41.96205
n  ,  41  ,  100  ,  43.06
n  ,  42  ,  102.5  ,  44.15905
n  ,  43  ,  105  ,  45.2592
n  ,  44  ,  107.5  ,  46.36045
n  ,  45  ,  110  ,  47.4628
n  ,  46  ,  112.5  ,  48.56625
n  ,  47  ,  115  ,  49.6708
n  ,  48  ,  117.5  ,  50.77645
n  ,  49  ,  120  ,  51.8832
n  ,  50  ,  122.5  ,  52.99105
n  ,  51  ,  125  ,  54.1
n  ,  52  ,  127.5  ,  55.21005
n  ,  53  ,  130  ,  56.3212
n  ,  54  ,  132.5  ,  57.43345
n  ,  55  ,  135  ,  58.5468
n  ,  56  ,  137.5  ,  59.66125
n  ,  57  ,  140  ,  60.7768
n  ,  58  ,  142.5  ,  61.89345
n  ,  59  ,  145  ,  63.0112
n  ,  60  ,  147.5  ,  64.13005
n  ,  61  ,  150  ,  65.25
n  ,  62  ,  152.5  ,  66.37105
n  ,  63  ,  155  ,  67.4932
n  ,  64  ,  157.5  ,  68.61645
n  ,  65  ,  160  ,  69.7408
n  ,  66  ,  162.5  ,  70.86625
n  ,  67  ,  165  ,  71.9928
n  ,  68  ,  167.5  ,  73.12045
n  ,  69  ,  170  ,  74.2492
n  ,  70  ,  172.5  ,  75.37905
n  ,  71  ,  175  ,  76.51
n  ,  72  ,  177.5  ,  77.64205
n  ,  73  ,  180  ,  78.7752
n  ,  74  ,  182.5  ,  79.90945
n  ,  75  ,  185  ,  81.0448
n  ,  76  ,  187.5  ,  82.18125
n  ,  77  ,  190  ,  83.3188
n  ,  78  ,  192.5  ,  84.45745
n  ,  79  ,  195  ,  85.5972
n  ,  80  ,  197.5  ,  86.73805
n  ,  81  ,  200  ,  87.88
n  ,  82  ,  202.5  ,  89.02305
n  ,  83  ,  205  ,  90.1672
n  ,  84  ,  207.5  ,  91.31245
n  ,  85  ,  210  ,  92.4588
n  ,  86  ,  212.5  ,  93.60625
n  ,  87  ,  215  ,  94.7548
n  ,  88  ,  217.5  ,  95.90445
n  ,  89  ,  220  ,  97.0552
n  ,  90  ,  222.5  ,  98.20705
n  ,  91  ,  225  ,  99.36
n  ,  92  ,  227.5  ,  100.51405
n  ,  93  ,  230  ,  101.6692
n  ,  94  ,  232.5  ,  102.82545
n  ,  95  ,  235  ,  103.9828
n  ,  96  ,  237.5  ,  105.14125
n  ,  97  ,  240  ,  106.3008
n  ,  98  ,  242.5  ,  107.46145
n  ,  99  ,  245  ,  108.6232
n  ,  100  ,  247.5  ,  109.78605
n  ,  101  ,  250  ,  110.95
n , 102 , 9.163 , -0.579


!定义材料属性
et,1,link10,,2
mp,dens,1,4849.526
mp,ex,1,2e11
!生成单元
r,1,0.01517,0.001648
r,2,0,19111
type,1
mat,1
real,1
*do,k,1,100,1
e,k,k+1
*enddo
sstif,on
!施加约束
d,1,all
d,101,all
/solu
acel,,9.81
solve
finish

/solu
antype,modal
modopt,lanb,10,0.2,10
d,1,all
d,101,all
pstres,on
mxpand,10
solve
finish

/solu
antype,trans
trnopt,full
d,1,all
d,101,all
alphad,0.014
betad,0.000092
sstif,on
autots,on
nsubst,1 !每一荷载步的子步数
kbc,0
*do,i,1,2000,1
*if,i,le,1200,then
time,0.05*i
f,7,fy,-1800*sin(6.283*0.05*i)
*else
time,0.05*i
f,7,fy,-1800*sin(0*0.05*i)
*endif
solve
!lswrite,i
*enddo
outres,all,all
finish

/post26
solu,
nsol,2,4,u,y
nsol,3,8,u,y
/grid,1
/axlab,y,amplitude(m)
plvar,2,3
prcplx,1
prvar,2,3
finish

作者: caohong 时间: 2005-7-28 15:29 标题: 回复：求助：拉索振动仿真

得到的8＃位位移时程。怎么不是正弦曲线啊？

作者: caohong 时间: 2005-7-28 15:33 标题: 回复：求助：拉索振动仿真

试验实测8＃位位移时程曲线。

欢迎光临中华钢结构论坛 China Structure Forum (http://okok.org/)