文献类型：期刊文献

中文题名：基于柔度派生灵敏度的梁结构损伤识别研究

英文题名：DAMAGE DETECTION OF BEAM STRUCTURE USING DERIVED SENSITIVITY BASED ON STRUCTURAL FLEXIBILITY

作者：赵靖芸[1];杨秋伟[1];李翠红[1];张莹[1];梁超锋[1]

机构：[1]绍兴文理学院土木工程系

年份：2017

卷号：39

期号：6

起止页码：1450

中文期刊名：机械强度

外文期刊名：Journal of Mechanical Strength

收录：CSTPCD、、北大核心2014、CSCD_E2017_2018、Scopus、北大核心、CSCD

基金：国家自然科学基金资助项目(11202138)资助~~

语种：中文

中文关键词：损伤识别;派生灵敏度;结构;柔度

外文关键词：Damage identification; Derived sensitivity ; Structure ; Flexibility

中文摘要：柔度方法在结构损伤识别中有着广泛的应用,研究三种基于柔度派生灵敏度的结构损伤识别方法,它们分别是:对角线灵敏度、主特征向量灵敏度和单位荷载最不利布置灵敏度。详细推导了三种派生灵敏度的计算公式,并以一个三跨连续梁为例对所提方法进行了比较验证。计算结果表明:当采用前4阶模态数据时,柔度灵敏度方法和主特征向量灵敏度方法都可以较好的识别出结构损伤。当仅采用第一阶模态时,柔度灵敏度方法基本不可用,单位荷载最不利布置灵敏度方法对于识别支座附近单元损伤特别有效,而主特征向量灵敏度方法综合表现最佳。工程实践中应根据具体的工况来选择合适的灵敏度以获得最好的识别结果。

外文摘要：The flexibility-based damage identification methods have attracted much attention in structural engineering field in recent years. In this paper,three derived sensitivity methods based on structural flexibility are presented for damage identification,namely,the diagonal sensitivity,the principal eigenvector sensitivity and the unfavorable unit load distribution sensitivity. Compared with the original flexibility sensitivity technique,the effect of truncating higher-order modes can be partly reduced in the derived sensitivity methods. A three-span continuous beam was used to illustrate the feasibility and superiority of the derived sensitivity methods for structural damage detection. Results obtained by the first four modes and only the first mode are both given for comparison. When the first four modes are used,it is found that the principal eigenvector sensitivity and the flexibility sensitivity methods can achieve more accurate results than those obtained by the diagonal sensitivity and the unfavorable unit load distribution sensitivity techniques. When only the first mode is used,one can see that the principal eigenvector sensitivity and the unfavorable unit load distribution sensitivity techniques are more effective than the flexibility sensitivity and the diagonal sensitivity methods. Consequently,it is necessary to chose suitable sensitivity technique for the specific engineering problem to get satisfactory detection results.