大跨桥梁结构以健康监测和状态评估为目标的有限元模拟  

Finite element modeling for health monitoring and condition assessment of long-span bridges

作　　者：李兆霞[1] 李爱群[1] 陈鸿天[2] 郭力[1] 周太全[1] 

机构地区：[1]东南大学土木工程学院,南京210096 [2]香港理工大学土木及结构工程系

出　　处：《东南大学学报（自然科学版）》2003年第5期562-572,共11页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目 (5 0 1780 19;5 0 2 780 17);香港政府研资局 (RGC)资助项目 (PolyU 5 0 42 /0 1E;PolyU 5 13 4/0 3E)

摘　　要：通过对桥梁结构健康监测和评估研究现状的简单评述 ,讨论了结构健康监测和状态评估中的关键理论与技术问题 ,介绍了笔者近年来在大型桥梁以健康监测和状态评估为目标的结构模拟方面开展的一系列关键理论和技术问题研究 ;通过对 2个大跨悬索桥———香港的青马大桥和江苏的润扬长江公路大桥的有限元建模和模型修正过程 ,探讨了大跨桥梁结构以健康监测和状态评估为目标的有限元模拟的技术要求、建模方案与策略 .研究表明 :大跨桥梁以结构状态评估为目标的有限元模拟 ,必须是建立于衔接理论基础上的多尺度结构模拟 .在桥梁结构整体动力响应分析确定了关键损伤构件的基础上 ,需进一步建立关键构件的局部模型以分析在桥梁结构全尺度有限元模型中无法模拟的细节行为 ,即发生于焊连接件的局部应力集中和损伤累积行为 .Serious limitations and problems on the practical use of Structural Health Monitoring (SHM) and finite element (FE) modeling for the purpose of structural health monitoring and condition assessment are discussed. The key issues in FE modeling of long-span bridges for health monitoring and condition assessment has been studied by our group for several years. The FE models of the Tsing Ma Bridge (TMB) in Hong Kong and Runyang Yangtse Bridge (RYB) in Jiangsu have been developed respectively for the purpose of structural health assessment and installation of a structural health system on RYB. The result shows that the model for the purpose of health assessment should be developed on the basis of transition theory for linking elements between local-scale at material points and full-scale at the structural level. Model updating and validation are necessary for an accurate modeling of the complicated bridge structures. Some critical components are determined from the analysis of the structural response by using the FE model of TMB in full-scale, then the local FE models are developed and used to determine the behavior of hot-spot stress and fatigue accumulation at critical locations.

关 键 词：大跨桥梁 健康监测 状态评估 结构识别 有限元模拟 

分 类 号：O346.5[理学—固体力学]