基于结构健康监测系统的大跨钢桥多尺度疲劳损伤演化分析研究

项目名称： 基于结构健康监测系统的大跨钢桥多尺度疲劳损伤演化分析研究

项目编号： No.51208260

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 余洋

作者单位： 南京理工大学

项目金额： 25万元

中文摘要： 针对基于结构健康监测系统的大跨钢桥疲劳损伤状态评估研究中亟待解决的关键问题，从理论分析、实验研究、数值模拟和工程应用四个方面，提出了针对大跨桥梁结构特性进行整体结构响应与局部损伤同步计算的多尺度模拟分析方法，通过对含有典型焊连接细节的钢箱梁关键构件的疲劳损伤实验，建立了引入合适疲劳损伤本构模型和恰当疲劳失效准则的损伤实验模型，揭示了在车辆交通载荷和环境因素共同影响下所关注细节的疲劳损伤演化机理与失效路径，考虑了损伤破坏的多尺度物理机理及其耦合作用，深入研究了细节局部失效与整体结构破坏之间的关系。通过对工程实例香港青马大桥及其结构健康监测系统数据的研究，总结出适用于大跨钢桥的多尺度疲劳损伤模拟的通用步骤及高效实施策略，其研究成果加强了我们对桥梁关键部位疲劳损伤特性和疲劳失效行为本质的了解，对进一步推广应用于大跨复杂桥梁结构更准确的疲劳损伤状态评估，有极其重要的工程意义。

中文关键词： 大跨钢桥；多尺度模拟；结构健康监测；损伤分析；健康状态评估

英文摘要： The purpose of this project is to perform the multi-scale fatigue damage evaluation of long-span steel bridge on the basis of the structural health monitoring system at the aspects of theoretical analysis, experimental study, numerical simulation and engineering application. The strategy and implementation for multi-scale modeling of long-span steel bridge considering structural global responses and local damage simultaneously are firstly investigated. The fatigue damage test of critical component with typical local welding details is then carried out in laboratory. The proper fatigue failure code is further incorporated in damage constitutive model for fatigue damage evolving mechanism and failure path of local details subjected to vehicle loading as well as environmental factors. The physical nature and coupling effects of multi-scale fatigue damage, and the relationships between local failure and global lapse are also studied. The Tsing Ma Bridge and its structural health monitoring system are taken as engineering application case study in order to propose the general procedure and effective implementation methods for multi-scale fatigue damage analysis of long-span bridge structure. This investigation enhance the knowledge of fatigue nature in fatigue damage process of critical locations and better understa

英文关键词： long-span steel bridge；multiscale simulation；structural health monitoring；damage analysis；health status assessment