复杂荷载条件下桥上无砟轨道无缝线路纵向力作用机理研究

With the development of high-speed railway，the unballasted track CWR on bridge get more and more applications. The safeties of high-speed train running on the bridge become a hot research issue. The force of the bridge CWR is very complex. It includes the temperature load, the train dynamic load, the braking load, and the additional force caused by the expansion and deflection of bridge including track slab. The three dimensional static model of the bridges-track slab-rail system due to the longitudinal load and the dynamic coupling model of the train-unballasted track-bridge system are established respectively by considering the interaction of vehicles, track plates and bridges in this project. As results, the longitudinal forces of the ballasted track CWR on the bridge under the complex loading conditions are studied. In order to monitor the force and deformation of the unballasted track CWR on the bridge, the long-term monitoring system and the security status of early warning platform are built. Combining the theoretical and experimental studies, the longitudinal force action mechanism of unballasted track CWR on Bridge under complex loading conditions are revealed. Results of this project are expected to provide the theoretical guidance for the design and construction of the bridge ballasted track CWR, and provide the theoretical basis and technical support for the railway Line Status real-time data dissemination and security warning.

随着高速铁路的发展，桥上无砟轨道无缝线路得到越来越多的应用，高速列车在桥上行车的安全性成为学者研究的热点问题。桥上无缝线路的受力比较复杂，除受温度荷载、列车动荷载、制动荷载外，还要受到桥梁（轨道板）伸缩挠曲引起的附件力作用。本项目考虑车辆、轨道板、桥梁的相互作用，分别建立桥梁、轨道板、钢轨纵向作用的空间静力学模型及列车－无砟轨道－桥梁耦合系统动力分析模型，研究复杂荷载条件下桥上无砟轨道无缝线路的纵向力；构建桥上无砟轨道无缝线路受力、变形的长期监测技术体系及安全状态预警平台。采用理论研究与试验研究相结合的方法，揭示高速铁路桥上无砟轨道无缝线路纵向力的作用机理。预计本项目的研究成果可为我国桥上无砟轨道无缝线路的设计、施工提供理论指导，为线路状态监测数据实时发布和安全预警提供理论依据和技术支持。

本项目针对桥上无砟轨道无缝线路这一庞大复杂体系，考虑车辆、轨道板、桥梁的相互作用，分别建立了桥梁、轨道板、钢轨纵向作用的空间耦合静力模型及列车-无砟轨道-桥梁耦合系统动力分析模型，研究了桥上无砟轨道在复杂温度荷载、制动荷载、列车荷载作用下的受力变形特性，分析了敏感参数对轨道结构受力变形的影响规律，并开发了系列计算软件；构建了桥上无砟轨道无缝线路受力、变形的长期监测系统，该系统已经应用于京沪高速铁路试验段无缝线路实时监测中，应用结果表明，系统性能稳定，数据采集、传输顺畅，可以满足高速铁路无缝线路长期、远程、实时监测的需要。本项目的研究成果可为我国桥上无砟轨道无缝线路的设计、施工提供理论指导，为线路状态监测数据实时发布和安全预警提供理论依据和技术支持。.通过项目研究，获中国铁道学会铁道科技特等奖1项；授权发明专利3项，授权实用新型专利4项；授权计算机软件著作权9项；发表学术论文9篇，其中EI收录2篇，国际会议论文1篇；参加国际学术会议18人次；培养人才5人，其中博士1人，硕士4人。