铁路系杆拱桥拱肋横向振动及刚度改善研究-《高速铁路技术》

文章信息/Info

Title:: Research on Improvement of Transverse Vibration and Stiffness for the Arch Ribs of a Railway Tied Arch Bridge

Author(s):: WANG Fawu; China Railway Shanghai Design Institute Group Co., Ltd., Shanghai 200070, China

Keywords:: railway bridge|arch bridge|transverse stiffness|train-bridge coupling vibration

摘要:: 系杆拱桥是我国铁路大跨度桥梁的常用桥型，具有竖向刚度大和建筑高度低的特点。对于单线系杆拱桥，其横向刚度较低，过大的拱肋横向振动对拱肋自身及其上设备有不利影响，但是我国规范并未对拱桥拱肋的横向刚度进行限制。文章采用车桥耦合振动分析，重现了拱肋刚度不足情况下出现的车桥共振现象，通过增设K型横撑的方式提高拱肋横向刚度，以避开货物列车横向蛇形运动频率，从而大幅减小拱肋横向振动。建议在类似工程中注意拱肋横向刚度的合理设计，并在车桥耦合振动分析和现场实测中重点关注拱肋的横向振动情况。

Abstract:: Tied arch bridges are featured by large vertical stiffness and low building height. As a result, it is widely used for long-span railway bridges in China. The lateral stiffness of the single-line tied arch bridges is generally low, which causes large lateral vibration on the arch ribs. The vibration of the arch ribs has a negative impact on the ribs themselves and equipment installed on the ribs. However, the codes in China do not specify the lateral stiffness limits for the arch ribs of the bridge. In this paper, the train-bridge coupling vibration analysis is used to reconstruct the resonance phenomenon in the case of insufficient stiffness of the arch ribs. In order to avoid resonance responses, the lateral stiffness of the arch rib is increased by the proposed K-shaped bracing for the ribs. Significantly reduction of the lateral vibration on the arch ribs is obtained through this proposed design scheme. It is suggested that the reasonable design of transverse stiffness of arch ribs should be paid attention to in similar projects, and the lateral vibration of arch ribs should be paid attention to in the train-bridge coupling vibration analysis and field measurements.