柔度曲率法对梁结构的损伤诊断  

Damage Diagnosis of Beam Structures by Flexibility Curvature Method

作　　者：李永梅[1,2] 周锡元[1] 高向宇[1] 耿麟[1] 赵胥英[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100022 [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100022

出　　处：《北京工业大学学报》2008年第11期1173-1178,共6页Journal of Beijing University of Technology

基　　金：北京市自然科学基金资助项目(8062009);中国博士后科学基金资助项目(20060390387)

摘　　要：针对各种支承形式梁结构的损伤诊断,采用结构柔度矩阵最大列元素的柔度曲率(M_(FC))对悬臂梁进行损伤定位,采用损伤结构柔度矩阵主对角元素的柔度曲率(D_(FC))对非悬臂梁进行损伤定位,算例表明,针对不同形式的梁构造不同柔度曲率指标,仅用损伤结构少数低阶的模态参数,就可以对非悬臂和悬臂梁结构进行损伤定位识别,本文方法求得的柔度曲率曲线既能识别单个损伤的存在,也能识别多个损伤的位置,并能定性地反映损伤程度。To locate structural damages for differently supported beams, one method of flexibility curvature MFC was constructed by the maximum in each column of flexibility matrix for cantilever beams. The other method of flexibility curvature DFC was constructed from principal diagonal elements of flexibility matrix as a new indicator for non-cantilever beams. The numerical simulation sups indicate that the damage location in structures can be identified without baseline modal parameters by DFC for non-cantilever beams and MFC for cantilever beams, by which not only simple damage but also multiple ones can be detected and degree of structural damage can also be derived by using only a few of the lower frequency modes.

关 键 词：结构 损伤诊断 柔度 曲率 模态参数 

分 类 号：TU31[建筑科学—结构工程] O327[理学—一般力学与力学基础]