曲率模态及其在桁架桥梁损伤识别中应用  

Application of Curvature Mode Shape in Damage Identification of Truss Bridge

作　　者：叶黔元[1] 翟立祥[1] 陈锦辉[1] 

机构地区：[1]上海理工大学城市建设与环境工程学院,上海200093

出　　处：《力学季刊》2005年第2期286-292,共7页Chinese Quarterly of Mechanics

摘　　要：当前桥梁的安全性问题日益引起人们的广泛关注,对桥梁结构进行状态监测和安全评估成为众多学者的研究课题。在目前所采用的各种方法中,模态分析法的应用最为广泛,通过监测桥梁的模态参数即可获得其状态信息。通常在模态分析中所采用的参数如:固有频率、振型等参数,反映的都是结构的整体特性,难以用来确定故障位置,只有利用能够表征结构局部特性信息的模态参数曲率模态的变化,才能完成桥梁状态监测工作。本文以1∶10钢桁架桥梁模型为研究对象,用有限元模型及实验模型进行局部损伤的识别,实验采用锤击法及变时基(VTB)技术对桥梁模型进行了模态分析。识别表明,通过曲率模态的变化可明显识别结构的损伤部位,取得了很好的识别效果。为今后桥梁结构损伤识别提供了一种可行的研究方法。With the rapid development of bridge construction, the quality and life of bridge are paid more attention, it has become the hotspot of research in civil engineering. The method of model analysis is widely used for structure damage detection, in this method frequency and vibration mode are not sensitive parameters of structure damages. It is verified theoretically that the “change of curvature mode shape” are sensitive parameters of structure damages. Based on the steel truss bridge mode of 1∶10 scale, the identification methods of bridge structure damage detection was discussed. By finite element method and hammer pound method with Varied-Time-Base (VTB) technology, the modal test analysis of bridge modal was done. It shows that the change of curvature mode shape has an obvious effect to identify the location damage. So it poses a practicable research method for structure damage identification in future.

关 键 词：钢桁架桥梁 模态分析 损伤定位 

分 类 号：TU317[建筑科学—结构工程]