高速铁路无砟轨道-桥梁结构体系经时行为研究

项目名称： 高速铁路无砟轨道-桥梁结构体系经时行为研究

项目编号： No.U1434204

项目类型： 联合基金项目

立项/批准年度： 2015

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： 270万元

中文摘要： 我国高速铁路广泛采用纵连式无砟轨道-桥梁结构体系，其经时行为动态演化进程将影响高速列车的运营安全。本项目针对高速铁路纵连式无砟轨道-桥梁结构体系竖向多层的构造特点和受力特征，研发高速铁路无砟轨道-桥梁结构体系经时行为的试验方法，系统开展列车荷载与环境共同作用下无砟轨道-桥梁结构体系协同工作性能、长期变形性能和耐久性等经时行为的试验研究和数值模拟，揭示高速铁路无砟轨道-桥梁结构相互作用的动态演化机理，建立考虑材料随机性和时变性的高速铁路无砟轨道-桥梁结构体系经时行为计算理论和设计方法，提出信息更新条件下基于高阶矩理论的高速铁路无砟轨道-桥梁结构体系时变可靠度分析和状态评估方法。研究成果将为进一步提升我国高速铁路无砟轨道-桥梁结构体系建造技术、建立相应的服役状态评估体系、完善相关国家或行业技术标准提供理论依据和技术支撑。

中文关键词： 高速铁路；无砟轨道-桥梁结构体系；经时行为；相互作用动态演化机理；时变可靠度

英文摘要： The longitudinally connected ballastless track-bridge structure system is widely adopted by the high-speed railway system in china, and the dynamic evolution process of this critical structure system has important impact on the operation safety of high-speed train. As a vertically multi-layered architecture, this track-bridge structure system has special tectonic features as well as loading behaviors. According to these issues, this project will focus on several topics as follows: first, it is quite important to develop a new experimental method, which is able to simulate the time-dependent behavior of ballastless track-bridge structure system. With this test method, the time-dependent behaviors, such as the interaction of each component in the track-bridge structure system, the long-term deformation property and the durability of the structure system, can be fully considered by the developed test method. Second, associated with the test data, a numerical simulation will be conducted to systematically investigate those long-term behaviors. Based on the tests and simulation, this project will reveal of the dynamic evolution mechanism of interactions between the track and bridge, establish the theoretical model and design method for the structures system considering the randomness and variability of engineering materials, and suggest the appropriate time-dependent reliability analysis and conditional assessment for the ballastless track-bridge structure system with information updating based high-order moment method. The outcomes of this research projects will improve the construction technology, establish the conditional assessment method, and enhance the relevant national or industry standards by providing scientific basis or technical support.

英文关键词： NULL