钢桥疲劳评估研究进展  

RESEARCH PROGRESSES IN FATIGUE ASSESSMENT OF STEEL BRIDGES

作　　者：周晖[1] 施刚[1] 王元清[1] 石永久[1] 

机构地区：[1]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084

出　　处：《钢结构》2013年第4期1-6,19,共7页Steel Construction

基　　金：铁道部科技研究开发计划(2012G011-E)资助项目;清华大学黄廷芳信和优秀博士生支持基金资助项目

摘　　要：介绍近期国内外关于钢桥疲劳研究的新进展,主要是热点应力法、临界距离理论法、连续介质损伤力学和断裂力学法在钢桥疲劳评估中的应用。分析现行设计规范推荐的疲劳评估法存在的不足,提出钢桥疲劳三阶段评估法。在整体-局部模型和局部精细化模型中采用热点应力、临界距离理论与断裂力学法是三阶段疲劳评估的关键内容。三阶段疲劳评估法具有良好的普遍适用性,可提高疲劳寿命评估的效率和准确性。Research progresses in the fatigue of steel bridges at home and abroad are introduced in this paper. The investigations are mainly concentrated on different approaches applied in the fatigue assessment of steel bridges, such as hot spot stress method, the theory of critical distance, continuum damage mechanics and fracture mechanics, etc. The shortcomings of the fatigue evaluation method recommended by the current design codes or specifications are analyzed and a three stage fatigue assessment procedure is proposed. The key aspects of the three- stage fatigue assessment of the steel bridge are as follows： the global-local bridge model and the hot spot stress method, the theory of critical distance, fracture mechanics adopted in the local refined model. The proposed three- stage fatigue assessment procedure has a good general applicability, and can improve the efficiency and accuracy of the fatigue life prediction.

关 键 词：钢桥 疲劳 整体-局部模型 临界距离理论 断裂力学 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]