基于向量式有限元的大跨高速铁路桥梁风-车-轨-桥互制机理与失效全过程研究

项目名称： 基于向量式有限元的大跨高速铁路桥梁风-车-轨-桥互制机理与失效全过程研究

项目编号： No.51478429

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 段元锋

作者单位： 浙江大学

项目金额： 85万元

中文摘要： 我国已开始大量兴建大跨高速铁路桥梁。高速列车对运行平稳性要求提高，而大跨桥梁在强风和高速列车的共同作用下更易产生变形和振动，二者通过轮轨接触，成为一个互制系统。为了保证列车运行安全和桥梁结构安全，必须对强风-高速列车-轨道-大跨桥梁之间的互制机理和失效全过程进行研究，以再现灾害过程，确定预警指标，判定安全状态，制定控制措施。现有研究难以实现列车脱轨倾覆和桥梁破坏全过程模拟。向量式有限元是求解大变形、大变位、弹塑性、接触、碰撞等非线性或不连续力学行为的新方法，可以通过简单而系统化的程序对结构真实行为进行模拟。本项目拟采用向量式有限元建立风-车-轨-桥耦合系统动力学模型，对高速列车于强风作用下在大跨桥梁上的脱轨倾覆和桥梁破坏全过程进行模拟，发展出一整套强风-高速列车-轨道-大跨桥梁耦合作用及其优化控制措施的理论和技术体系，为保障我国高速铁路在强风下的安全高效运行提供研究基础和技术支持。

中文关键词： 向量式有限元；高速铁路；风-车-轨-桥互制；车桥耦合；风致振动

英文摘要： China has entered an era of largely building long-span high-speed railway bridges. High-speed railway requires strictly on ride quality, while long-span bridges are prone to deformation and vibration under the combined effect of strong wind and high-speed train. The train and the bridge interact with each other by the wheel-track contact, and they make up an interactive system. So it is significant to study the interaction mechanics between strong wind, high-speed train, ballastless track and long-span bridges, as well as the entire process of failure, which is extremely helpful to represent the failure process, to determine the early-warning index, to evaluate the safety, and to develop the control measures. Existing studies are difficult to realize the whole-process simulation of the train derailing and capsizing and the bridge destroy. Vector form intrinsic finite element (VFIFE) is a new method to solve nonlinear and discontinuous mechanics behavior such as the large deformation and large displacement, elasto-plasticity, contact, collision, etc. it can be used to simulate the real behavior of the structure by simple and systematic program. This project intends to adopt the VFIFE method to establish the dynamic model of the wind - train - track - bridge coupled system, to simulate the whole-process of the train derailing and capsizing and the bridge destroy due to strong wind, and to develop a set of strong wind - high-speed train - ballastless track - large-span bridge coupling function and optimal control theory and technology system, to provides research basis and technical support to guarantee the safety efficiency of the high-speed railway under the strong wind in our country.

英文关键词： Vector Form Intrinsic Finite Element;High-speed Railway;Wind-train-rail-bridge Interaction;Train-bridge Coupling;Wind-induced Vibration