项目名称: 列车荷载与环境耦合作用下重载铁路桥梁疲劳数值模拟与可靠度研究
项目编号: No.51278496
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 建筑科学
项目作者: 余志武
作者单位: 中南大学
项目金额: 85万元
中文摘要: 我国重载铁路具有载荷重、行车密度高和服役环境复杂等特点,其疲劳损伤演化和累积问题突出。但目前我国尚无专门针对重载铁路桥梁结构疲劳的设计与评估理论体系,已有的研究也并未考虑疲劳荷载与环境耦合效应的影响。为此,本项目拟对列车荷载与环境耦合作用下重载铁路桥梁疲劳性能数值模拟、可靠度理论、状态评估与寿命预测展开深入的研究,具体内容包括:研究重载铁路桥梁损伤演化模型的建模理论和方法,提出结构材料疲劳损伤本构和考虑桥梁结构环境-疲劳荷载耦合作用效应的重载铁路桥梁疲劳性能数值模拟方法,实现重载铁路桥梁疲劳损伤演化的多尺度模拟;研究列车荷载与环境因素耦合作用下重载铁路桥梁全寿命疲劳可靠度理论,提出信息不完备和信息更新条件下重载铁路桥梁结构疲劳时变可靠度分析方法,并建立基于时变可靠度的重载铁路桥梁疲劳状态评估与寿命预测方法。为重载铁路桥梁结构的疲劳设计、状态评估和寿命预测提供重要的理论基础。
中文关键词: 重载铁路桥梁;疲劳荷载与环境耦合作用;数值模拟;可靠度;状态评估
英文摘要: China's heavy haul railways with heavy loads, high traffic density and complexity of service environment have exhibited the outstanding fatigue damage and cumulative problem,but fatigue design and assessment theory system of heavy haul railway bridge is not established. At the same time, the previous research does not take into account the effect of fatigue load and environment coupling action. Therefore, this project will research the numerical simulation, reliability thoery, condition assessment and life prediction of heavy haul railway bridge under the coupled effect of train load and environmental action. Modeling theory and method of fatigue danage evolution model for heavy haul railway bridge will be analysed, and fatigue damge constitutive model of materials and fatigue behavior numerical simulation method of structure will be proposed considering the effect of fatigue load and environment coupling action. The fatigue damage evolution of heavy haul railway bridge will be simulated based on mul-scale theory. The life cycle fatigue reliability theory of heavy haul railway bridge under the effect of fatigue load and environment coupling action will be researched, and fatigue time-dependent reliability analysis method of heavy haul railway bridge is putted forward under the information imperfection and updat
英文关键词: Heavy haul railway bridge;Coupled effect of train load and environmental act;Numerical simulation;Reliability;Condition assessment