高速铁路实腹拱桥收缩徐变效应对轨道不平顺影响研究  

The Shrinkage and Creep Effect of Solid-spandrel Arch Bridges on Track Irregularity in High Speed Railways

作　　者：任永飞 REN Yongfei(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an Shaanxi 710043,China;Shaanxi Railway and Underground Traffic Engineering Key Laboratory,Xi'an Shaanxi 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043 [2]陕西省铁道及地下交通工程重点实验室,陕西西安710043

出　　处：《中国铁路》2024年第9期40-49,共10页China Railway

基　　金：中铁第一勘察设计院集团有限公司科研开发项目(KY23-B002)。

摘　　要：为研究高速铁路实腹拱桥收缩徐变效应对轨面变形和高低不平顺的影响,以某主跨52 m的实腹拱桥为研究对象,建立考虑施工阶段收缩徐变影响的桥梁-轨道系统一体化有限元模型,分析ZK活载、整体降温和桥梁收缩徐变等因素引起的轨面变形及高低10 m弦不平顺值分布规律,并基于10 m和30 m弦测值,拟合了不同降温条件下各铺轨龄期桥梁收缩徐变不平顺的发展规律函数,预测了轨面线形修整的周期。研究结果表明:实腹拱桥整体竖向刚度大,但对温度和收缩徐变效应较敏感;不同荷载工况下均在跨中产生最大轨面沉降变形,受梁端折角影响,梁端范围产生最大高低不平顺值,桥梁跨中范围轨面变形相对平缓;基于对数型函数拟合的不同降温工况收缩徐变轨面不平顺发展规律较为准确,由此确定的轨面线形修正周期为:整体降温20℃时为43.8 a,整体降温25℃时为16.5 a,整体降温30℃时为5.6 a。To study the shrinkage and creep effect of solid-spandrel arch bridges on rail surface deformation and longitudinal level irregularity in high speed railways,this paper takes a solid-spandrel arch bridge with a main span of 52 m as the research object and establishes an integrated finite element model of the bridge-track system by considering the shrinkage and creep effect during the construction phase,analyzes the rail surface deformation and the distribution law of the longitudinal level irregularity values measured at 10 m caused by factors such as ZK live load,overall cooling,and bridge shrinkage and creep.Based on 10 m and 30 m chord measurement values,the development law function of shrinkage and creep irregularity of bridges with different track-laying ages under different cooling conditions is fitted,and the correction period of rail surface alignment is predicted.The study results show overall vertical rigidity of solid-spandrel arch bridge is large,but it is sensitive to temperature and shrinkage creep effects.Under different load conditions,the maximum rail surface settlement deformation occurs in the midspan.Due to the influence of beam end angle,the maximum longitudinal level irregularity value occurs within the beam end range,and the rail surface deformation within the bridge midspan is relatively gentle;the development law of rail surface irregularity due to shrinkage and creep under different cooling conditions fitted based on logarithmic function is more accurate,and the correction period of rail surface alignment determined thereby is:The overall cooling is 43.8 a at 20°C,16.5 a at 25°C and 5.6 a at 30°C.

关 键 词：实腹拱桥 分层分段施工 无砟轨道 收缩徐变 轨道不平顺 弦测法 

分 类 号：U216.9[交通运输工程—道路与铁道工程]