工程结构损伤定位方法的研究  

Damage Localization for Three-Dimensional Structures

作　　者：李华军[1] 方辉[1] S.L.James.Hu 

机构地区：[1]中国海洋大学工程学院 [2]Department of Ocean Engineering, University of Rhode Island, Narragansett, RI 02882-1197, U.S.

出　　处：《中国海洋大学学报（自然科学版）》2005年第4期641-648,共8页Periodical of Ocean University of China

基　　金：国家自然科学(50479027);国家杰出青年科学基金(50325927)资助

摘　　要：针对三维框架结构等复杂大型土木工程结构,研究基于振动测试的结构损伤诊断方法,提出了1种精确、有效的基于交叉模态应变能(CMSE)的结构损伤诊断方法。传统的模态应变能方法是将损伤前后的同阶模态进行比较,而CMSE方法没有这个限制。此方法最大的优点是需要的模态信息数量少———通常一阶模态就足够了,除此之外CMSE方法不要求进行模态的归一化。文中以三维5层的框架结构的有限元模型对新的方法进行了验证。数值模拟中结构的损伤分为2种情况———单个单元损伤和多个单元的损伤。虽然只给出了三维框架结构的示例,但这种新方法同样适用于其他结构。In this paper Nondestructive Damage Detection in large/complete structures is investigated via vibration monitoring of three dimensional frame structures. An accurate, efficient method for the damage locations and damage severity simultaneously based on the employment of the cross modal strain energy (CMSE) is presented. While traditional modal strain energy methods must compare the modal information from the same ith mode for the baseline (analytical) and damaged (measured) structures, no such constraint is required for the CMSE method. The major advantages associated with the CMSE method are that minimal measured modal information is required—often a single measured mode is sufficient. Additionally, the CMSE method does not require the analytical and measured modes to be consistent in scale, or to be normalized in any specific way. Numerical studies in this paper will be conducted for three-dimensional five-story frame structures based on synthetic data generated from finite element models. Two particular tasks, single-damage and multiple-damage scenarios, are to be performed. Although the demonstration is conducted for a three-dimensional frame structure, the new method is also applicable to other kinds of structures.

关 键 词：损伤诊断 模态频率 模态振型 模态应变能 

分 类 号：TB123[理学—工程力学]