[1]邱洪兴,蒋永生.古塔结构损伤的系统识别Ⅰ:理论[J].东南大学学报(自然科学版),2001,31(2):81-85.[doi:10.3969/j.issn.1001-0505.2001.02.020]
 Qiu Hongxing,Jiang Yongsheng.System Identification for Structural Damage of Ancient Tower I: Theory[J].Journal of Southeast University (Natural Science Edition),2001,31(2):81-85.[doi:10.3969/j.issn.1001-0505.2001.02.020]
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古塔结构损伤的系统识别Ⅰ:理论()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
31
期数:
2001年第2期
页码:
81-85
栏目:
土木工程
出版日期:
2001-03-20

文章信息/Info

Title:
System Identification for Structural Damage of Ancient Tower I: Theory
作者:
邱洪兴 蒋永生
东南大学土木工程学院, 南京 210096
Author(s):
Qiu Hongxing Jiang Yongsheng
College of Civil Engineering, Southeast University, Nanjing 210096)
关键词:
系统识别 结构损伤 参数估计 判别分析 条件分布
Keywords:
system identification structural damage parameters estimation distinguish analysis conditional distributions
分类号:
TU311.2
DOI:
10.3969/j.issn.1001-0505.2001.02.020
摘要:
在结构损伤的系统识别中,损伤是用结构参数的减小来反映的.由于存在模型误差和测试误差,并不是所有的参数值减小代表损伤.本文提出的损伤区域的判别分析法将每一个可能的损伤状态定义为一个随机总体,通过比较样品到每一个总体的距离来确定样品与哪个总体最靠近,进而对损伤区域作出判断.算例表明,这一方法可以避免确定损伤单元数时的主观判断,减小误判的风险.本文提出的条件分布下损伤程度估计方法不仅利用参数变化量的均值信息,还利用它的协差阵信息,因而具有更高的识别精度.
Abstract:
In the system identification of structural damage, damage is usually expressed in terms of a reduction in the structural parameters. However, due to the errors in modeling and measurements, not all reductions in the structural parameters indicate damage. In the distinguish analysis method proposed in this paper for isolating the damage locations, every possible damage state is defined as a random collective entity. The distance between each of these collective entities and a given sample is calculated and compared, and that nearest to the sample is used for identifying the damage region. Trial examples of using this method show that subjective influences in determining the number of damage elements can be avoided and the risk of eventual misjudgment is substantially reduced. The method proposed in this paper for assessing the degree of damage under conditional distributions makes use not only the message imparted in the average value of changes in parameters, but also the message in the covariance matrix of changes in parameters, hence, it can achieve better identification accuracy.

参考文献/References:

[1] Sophia H,Jeong G D.Identification of stiffness reductions using natural frequencies.J of Engineering Mechanics ASCE,1995,121(10):1106~1113
[2] Law S S,Shi Z Y,Zhang L M.Structural damage detection from incomplete and noisy modal test data.J of Engineering Mechanics ASCE,1998,124(11):1280~1287
[3] Liu Pei-Ling,Chian Chung-Chi.Parametric identification of truss structures using static strains.J of Structural Engineering ASCE,1997,123(7):927~933
[4] 方开泰.实用多元统计分析.上海:华东师范大学出版社,1992.72~78,179~208
[5] Stetson Karl A.Perturbation method of structural design relevant to holographic vibration analysis.AIAA Journal,1975,13(4):457~459
[6] 邱洪兴.结构损伤的系统识别:[学位论文].南京:东南大学土木工程学院,2000

相似文献/References:

[1]邱洪兴,蒋永生,曹双寅.古塔结构损伤的系统识别Ⅱ:应用[J].东南大学学报(自然科学版),2001,31(2):86.[doi:10.3969/j.issn.1001-0505.2001.02.021]
 Qiu Hongxing,Jiang Yongsheng,Cao Shuangyin.System Identification for Structural Damage of Ancient Tower II: Application[J].Journal of Southeast University (Natural Science Edition),2001,31(2):86.[doi:10.3969/j.issn.1001-0505.2001.02.021]

备注/Memo

备注/Memo:
作者简介:邱洪兴,男,1962年生,博士,教授.
更新日期/Last Update: 2001-03-20