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基于频率改变的结构损伤诊断方法
引用本文:朱子,谭晋鹏.基于频率改变的结构损伤诊断方法[J].山东建筑大学学报,2006,21(6):471-473,479.
作者姓名:朱子  谭晋鹏
作者单位:1. 清华大学,土木工程系,北京,100084
2. 中冶京诚工程技术有限公司,北京,100053
基金项目:教育部跨世纪优秀人才培养计划;国家高技术研究发展计划(863计划)
摘    要:结构单元的损伤将导致损伤单元的单元刚度矩阵以及结构的总体刚度矩阵发生变化,通过损伤前后自振频率的改变,可对损伤单元刚度矩阵的损伤系数进行反演。本文发展了一种结构损伤定位和标定的两步方法,首先通过反演初步确定结构损伤的位置,然后将损伤单元(三维梁元)的刚度矩阵分解为拉压刚度矩阵和弯曲刚度矩阵,并分别对其损伤系数进行求解,从而确定截面积、截面惯性矩等单元截面参数的损伤情况。数值实验表明,该方法可对结构的损伤进行定位和标定。

关 键 词:建筑结构  振动特性  自振频率  损伤诊断
文章编号:1673-7644(2006)06-0471-03
收稿时间:2006-03-27
修稿时间:2006-03-27

Damage diagnosis of structures based on changes in frequency
ZHU Zi,TAN Jin-peng.Damage diagnosis of structures based on changes in frequency[J].Journal of Shandong Institute of Architecture and Engineering,2006,21(6):471-473,479.
Authors:ZHU Zi  TAN Jin-peng
Affiliation:1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2. Capital Engineering Research Incorporation Limited, Beijing 100053, China
Abstract:The structural damage will cause the perturbation of the stiffness matrix and natural frequency. A twostep damage detection method of structures based on the changes of frequency is presented. First, the location of damage is estimated. Then, the stiffness matrix of the suspicious damaged elements is decomposed to the compressing stiffness matrix and the bending stiffness matrix, the damage ratios of them are calculated respectively. The damage ratio of the area and moment of inertia in the section of the damaged element can be quantified by this method. Numerical results show that the method can localize and quantify the damage in the structures.
Keywords:building structure  vibration characteristic  natural frequency  damage diagnosis
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