一种不中断运行的既有桥梁结构损伤位置识别方法研究  

A Study on Location Identification of Structural Damage of In-serving Bridge without Interrupting Bridge Operation

作　　者：任永辉[1] 常军[1] 陈忠汉[1] 

机构地区：[1]苏州科技学院土木工程学院,江苏苏州215011

出　　处：《苏州科技学院学报（工程技术版）》2010年第2期52-55,65,共5页Journal of Suzhou University of Science and Technology （Engineering and Technology）

基　　金：江苏省自然科学基金项目(BK2007549);建设部研究开发项目(2008-K2-35)

摘　　要：结构损伤识别是了解结构健康状况,进而制定相应养护管理策略的基础之一。桥梁作为道路的关键点,如中断其运行会造成巨大的经济损失。如何寻求一种不中断其运行,而又能识别其损伤状况的方法是该论文的研究关键所在。随机子空间法是20世纪末提出的一种有效识别结构模态参数的方法,测试过程中无需对桥梁结构进行任何人工激励,仅需输出信号就可识别出结构模态参数,不必中断桥梁的运行。曲率模态方法识别结构损伤位置具有比结构振型更敏感的特性。论文将两种方法相结合,在不中断桥梁运行的前提下对其结构的损伤位置进行识别。最后,采用一数值模型案例对该方法进行验证。该方法可为桥梁健康状况诊断提供有效的理论依据。The structural damage identification is one of the bases to understand the status of the structure and then to set down the method to the appropriate conservation and management.The bridge,as a key point of roads,will cause huge economic losses if the operation is interrupted because of inspection.The key point of the paper lies in how to find a method which can identify the damage of the bridge without interrupting its operation.The stochastic subspace identification is an effective modal parameter identification method proposed at the end of the last century.The identification can be carried out without any artificial vibration,only the output of the signal can identify the modal parameters of the structure without bridge operation interruption.The curvature model of structural damage location identification is more sensitive than that of the structure formation.Combin-ing the two methods,the paper presents the identification of the bridge structure damage without interrupting its operation.Finally,a numerical simulation is used to evaluate the method.This method will provide an effective theoretical basis to the diagnose of the bridge conditions.

关 键 词：参数识别 既有桥梁 随机子空间 稳定图 模态分析 曲率模态 

分 类 号：X703.1[环境科学与工程—环境工程]