多动力作用下高速铁路轨道-桥梁结构体系动力学及关键技术研究

摘要： 针对多动力（列车、地震、侧风）作用下高速列车-轨道-桥梁系统动力学理论与关键技术存在的诸多技术疑难，持续开展了高速铁路轨道-桥梁结构体系模型试验、现场测试、理论分析与数值仿真，提出基于概率密度演化理论的多动力作用下轨道-桥梁系统随机振动分析方法和基于可靠度理论的桥上行车安全评定方法，研发了高速铁路轨道-桥梁系统试验平台和成套试验技术，提出高速铁路轨道-桥梁系统抗震设防和防风设计理念和评估方法，并研发了抗震防风及减灾技术，研究成果已在高速铁路轨道-桥梁结构体系设计与运营维护中推广应用。

Dynamics and key technology research on high-speed railway track-bridge system under multiple dynamic sources

There are many technical problems in the high-speed train-track-bridge system under multi-source excitation (e.g. train, earthquake and strong wind). The model experiments, field tests, theoretical analysis and numerical simulations of high speed railway track-bridge system were continually carried out in the past ten years. Based on the probability density evolution method, a random dynamic theory of track-bridge coupled system considering multi-source dynamic effect was newly built up, and the running safety estimation theory of high speed railway when train runs on the bridge was constructed. The experimental platform and complete test technology of high-speed railway track-bridge system, which solve the difficulties of the dynamic behavior representation of complex physical system, are established, and also the concept of earthquake fortification and wind resistant design of high-speed railway track-bridge system was innovated. The design and evaluation method of seismic and wind load are proposed, as well as the disaster reduction technology. These researches are vastly applied in the design and maintenance in high-speed railway track-bridge system.