基于频率改变的结构损伤诊断方法  

Damage diagnosis of structures based on changes in frequency

作　　者：朱子[1] 谭晋鹏[2] 

机构地区：[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

出　　处：《山东建筑大学学报》2006年第6期471-473,479,共4页Journal of Shandong Jianzhu University

基　　金：奥运场馆结构安全智能监测技术研究;教育部跨世纪人才基金(2003年次);海洋平台结构智能健康诊断技术研究;863计划(2002AA615110)资助课题

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。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.

关 键 词：建筑结构 振动特性 自振频率 损伤诊断 

分 类 号：TU311.2[建筑科学—结构工程]