高速铁路轨道-桥梁系统基于行车安全风险的抗震设计方法研究

The component section and Reinforcement of high speed railway track-bridge system differ from the buildings and the highway bridges , which means the traditional earthquake resistant goals of three performance level to the structure and the asesimic design method by using component’s ductility are no longer competed for the high speed railway track-bridge system, for which a new seismic design method should be proposed urgently. In this project, the high speed railway bridge and track will be recognized as a system, and the components of the system’s seismic Vulnerability will be analyzed to obtain critical components’ Vulnerability functions and curves. The quantitative analysis method based on the critical components’ damage status and the track’s irregularity will be established. Meanwhile, the evaluation index as well as the method of train running safety on bridge based on the track’s irregularity will proposed, and the earthquake resistant goals based on the risks of train running safety on bridge will be determined. The risk level of every critical component of the high speed railway track-bridge system will be determined. To establish the aseismic design method of the high speed railway track-bridge system based on performance of earthquake risk and propose the structural measures of seismic protection to the critical component and the measures to control track’s irregularities. Shaking table tests on high speed railway track-bridge system will be carried out under earthquake to verify the rationalization of the design method. The research results will present vital significance to the development and perfection of aseismic analysis method of high speed railway’s bridge, as well as the improvement on risk aversion of high speed railway’s bridge, and the enhancement to the level of science and technology on civil engineering in our country.

高速铁路轨道-桥梁系统的构件截面形式与配筋区别于房建与公路桥梁工程，传统的三性能水准设防目标和利用构件延性的抗震设计方法不再适用，急需提出新的设计方法与之相适应。本项目将高速铁路轨道和桥梁作为一个整体系统，分析各组成构件的地震易损性，得到关键构件的易损性函数及曲线，建立关键构件的损伤程度与轨道不平顺的定量分析方法，提出基于地震损伤引起轨道不平顺的桥上行车安全分析方法与评价指标，确定基于桥上行车安全风险的抗震设防目标；根据高速铁路轨道-桥梁系统各关键构件的风险等级水平，建立其基于地震风险的性能抗震设计方法，提出关键部位抗震保护构造措施和轨道不平顺控制方法；开展地震作用下高速铁路轨道-桥梁系统的振动台试验研究，验证设计方法的合理性。研究成果对发展和完善我国高速铁路桥梁结构抗震分析理论、提高高速铁路规避风险的能力和提升我国土木工程行业科学技术水平具有重要意义。

高速铁路轨道-桥梁系统的构件截面形式与配筋区别于房建与公路桥梁工程，传统的三性能水准设防目标和利用构件延性的抗震设计方法不再适用，急需提出新的设计方法与之相适应。本项目将高速铁路轨道和桥梁作为一个整体系统，分析各组成构件的地震易损性，得到关键构件的易损性函数及曲线，建立关键构件的损伤程度与轨道不平顺的定量分析方法，提出基于地震损伤引起轨道不平顺的桥上行车安全分析方法与评价指标，确定基于桥上行车安全风险的抗震设防目标；根据高速铁路轨道-桥梁系统各关键构件的风险等级水平，建立其基于地震风险的性能抗震设计方法，提出关键部位抗震保护构造措施和轨道不平顺控制方法；开展地震作用下高速铁路轨道-桥梁系统的振动台试验研究，验证设计方法的合理性。研究成果对发展和完善我国高速铁路桥梁结构抗震分析理论、提高高速铁路规避风险的能力和提升我国土木工程行业科学技术水平具有重要意义。研究成果是2019年湖南省科技进步一等奖、2017年度铁道学会特等奖及2019年度国家技术发明二等奖的组成研究内容之一，课题研究期间，发表论文49篇，其中SCI收录39篇，获得发明专利3项，培养博士研究生2名，硕士研究生12名。

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