大跨度刚构拱桥铺设无砟轨道适应性研究

Research on the Adaptability of Laying Ballastless Track on Long-span Rigid Frame Arch Bridge

研究目的:大跨度桥梁铺设无砟轨道已成为我国扩大无砟轨道应用范围的一大技术难题,本文以崔家营汉江特大桥主桥为工程实例,结合桥梁变形曲线及车桥耦合动力响应分析结果,提出大跨度桥梁铺设无砟轨道技术难点、技术要求以及评价指标,并得出相应的分析结果。研究结论:(1)崔家营汉江特大桥(135+2×300+135)m混凝土刚构拱竖向变形、曲率半径、竖向残余徐变变形、梁端变形、墩台沉降值均满足要求;(2)高速列车作用下桥梁动力响应均满足要求,具有良好的动力特性及列车走行性,安全性和乘坐舒适性均满足要求;(3)温度和徐变作用下竖向变形属于多波不平顺,300m弦高低不平顺已超出规范允许值;(4)本研究成果可为今后类似大跨度桥梁铺设无砟轨道适应性分析提供参考。

Research purposes: Laying ballastless track on long-span bridge has become a big technical problem in expanding the application scope of ballastless track in China. Taking the main bridge of Cuijiaying Hanjiang River Bridge as an engineering example,based on the bridge deformation curve and the analysis results of vehicle-bridge coupling dynamic response,the technical difficulties,technical requirements and evaluation indexes of ballastless track laying for long-span bridges are put forward,and the corresponding analysis results are obtained.Research conclusions:( 1) The vertical deformation,radius of curvature,vertical residual creep deformation,beam end deformation and pier settlement value of the( 135 + 2 × 300 + 135) m concrete rigid frame arch of Cuijiaying Hanjiang River Bridge meet the requirements.( 2) The dynamic response of the bridge under the action of high-speed train meets the requirements with good dynamic characteristics and train running performance,and both safety and ride comfort meet the requirements.( 3) The vertical deformation under the action of temperature and creep belongs to multi-wave irregularity,and the irregularity of 300 m chord has exceeded the allowable value of the code.( 4) The research results can provide reference for the adaptive analysis of ballastless track for similar long-span bridges in the future.