Influence of span-to-depth ratio on dynamic response of vehicle-turnoutbridge system in high-speed railway  

作　　者：Chuanqing Dai Tao Xin Shenlu Qiao Yanan Zhang Pengsong Wang Mahantesh M.Nadakatti 

机构地区：[1]School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China [2]China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100070,China [3]Karnatak Law Society’s Gogte Institute of Technology,Belagavi 590006,India

出　　处：《High-Speed Railway》2024年第1期30-41,共12页高速铁路（英文）

基　　金：supported by the National Key R&D Program of China(2022YFB2602900);the 111 Project(B20040);the China Railway Science and Technology Research and Development Program Project(N2023T011-A(JB)).

摘　　要：For high-speed railways,the smoothness of the railway line significantly affects the operational speed of trains.When the train passes through the turnout on a long-span bridge,the wheel-rail impacts caused by the turnout structure irregularities,and the instability arising from the bridge's flexural deformation lead to a strong coupling effect in the vehicle-turnout-bridge system.This significantly affects both ride comfort and operational safety.For addressing this issue,the present study considered a long-span continuous rigid-frame bridge as an example and established a train-turnout-bridge coupled dynamic model of high-speed railway.Utilizing a selfdeveloped dynamic simulation program,the study analysed the dynamic response characteristics when the train passes through the turnouts on the bridge.It also investigated the influence of different span-to-depth ratios of the bridge on the vehicle dynamic response when the train passes through the main line and branch line of turnouts and then proposed a span-to-depth ratio limit value for a long-span continuous rigid-frame bridge.The research findings suggest that the changes in the span-to-depth ratio have a relatively minor impact on the train’s operational performance but significantly affect the dynamic characteristics of the bridge structure.Based on the findings and a comprehensive assessment of safety indicators,it is advisable to establish a span-to-depth ratio limit of 1/4500 for a long-span continuous rigid-frame bridge.

关 键 词：Turnout on bridge Span-to-depth ratio Dynamic response Vehicle-turnout-bridge system High-speed railway 

分 类 号：U238[交通运输工程—道路与铁道工程] U441.3[建筑科学—桥梁与隧道工程]