摘要
文章基于市域快线工程特征,选取典型工程高架车站桥上无缝道岔集群系统为研究对象构建耦合仿真模型,通过集成轨道结构参数、桥梁系统特性及温度场,系统揭示市域快线长大桥无缝道岔群耦合体系在复杂服役条件下的应力传递机理与变形协调机制。根据文中的计算和分析可知,在温度场的作用下,钢轨温差对于钢轨和桥墩的受力以及道岔本身变形的影响均较大。相对于桥上单渡线的道岔区两侧钢轨根数一致的工况,桥上无缝道岔群的道岔区两侧钢轨根数通常不一致,导致桥梁两侧受到的钢轨力明显不同,造成连续梁桥墩受力明显增大,靠近连续梁的简支梁桥墩受力也会显著增加。因此,针对市域快线桥上无缝道岔群力学特性的计算和检算不能通过简单方法处理,还需仔细考虑钢轨数量变化的影响,以确保仿真结果能够准确指导设计。
Based on the engineering characteristics of urban express line,the seamless turnout group system on bridge in typical elevated station project is selected as the research object to establish a coupled simulation model.By integrating track structure parameters,bridge system characteristics and temperature field,the stress transmission mechanism and deformation coordination mechanism of coupling system of seamless turnout group on long-span continuous bridge of urban express line under complex service conditions are revealed systematically.According to the calculation and analysis in this article,it is understood that under the influence of the temperature field,the stress in the rails and bridge piers,as well as the deformation of the turnout itself are significantly affected by the rail temperature difference.Compared to the seamless single crossover on a bridge,where the number of rails is consistent on both sides of the turnout area,the number of rails on both sides of the seamless turnout group on bridge is generally different.This asymmetry results in significantly different rail forces on both sides of the bridge,leading to a significant increase in stress on the piers of long-span continuous bridge and even on the piers of the adjacent simply supported beams.Therefore,the calculation and verification of the mechanical characteristics of seamless turnout group on bridge of urban express line may not be processed simply,and the impact of changes in the number of rails must be carefully considered to ensure the simulation results accurately guide the design.
作者
曲村
李现博
陈鹏
QU Cun;LI Xianbo;CHEN Peng(Beijing Urban Construction Design&Development Group Co.,Ltd.,Beijing 100037,China;Beijing Engineering Research Center of Track Structure,Beijing 100037,China;National Engineering Research Center of Green&Safe Construction Technology in Urban Rail Transit,Beijing 100037,China)
出处
《现代城市轨道交通》
2025年第8期19-24,共6页
Modern Urban Transit
基金
国家重点研发计划课题(2024YFB3713002)
北京市自然科学基金(8252016)。
关键词
市域快线
温度场
桥上无缝道岔群
力学特性
urban express line
temperature field
seamless turnout group on bridge
mechanical characteristics
