高速铁路大跨度混凝土拱桥变形监测与分析  

Deformation monitoring and analysis of long span high-speed concrete arch railway bridge

作　　者：颜永逸 杨国静[1] 宋晓东[1] 翁顺[2] 田炜 YAN Yongyi;YANG Guojing;SONG Xiaodong;WENG Shun;TIAN Wei(China Railway Eryuan Engineering Group Co.,Ltd,Chengdu 610031,P.R.China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,P.R.China;Department of Civil&Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,P.R.China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]华中科技大学土木与水利工程学院,武汉430074 [3]香港理工大学土木及环境工程学系,香港999077

出　　处：《土木与环境工程学报（中英文）》2022年第3期79-85,共7页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51778258、51922046);中铁二院院控计划(KYY2019029(19-21))。

摘　　要：高速铁路设计时速快,变形控制要求高。由于结构的受力特点和混凝土材料的特性,混凝土拱桥在运营过程中会出现下挠变形,直接影响轨道线形和行车安全。为保障沪昆客运专线北盘江大桥的行车安全性和舒适性,通过对其建立自动化变形观测系统,分析其变形和温度数据的变化规律,结合拟合分析方法,确定温度和变形的影响系数,研究实测数据中徐变和温度效应的提取方法。结果表明:与同期人工观测数据相比,本系统的观测精度和有效性满足要求;桥面线形受温度变化影响较敏感,在低温时,不均匀沉降差值大,桥面线形相对不平顺,随着温度升高,沉降差值减小,桥面线形逐渐趋于平顺;通过建立的拟合计算徐变分析方法得到其相对徐变变形,与规范理论值相差约6%,满足工程要求。High-speed railways are designed with high speed and therefore with deformation control requirements.Due to the structural mechanical characteristics and the material properties of concrete,the concrete arch bridge inevitably exhibit downward deflection in operation,which directly affects the track alignment and operation safety.In order to ensure the driving safety and comfort of Beipanjiang Bridge in Shanghai Kunming passenger special line,an automatic deformation observation system was established to monitor the deformation and temperature changes.The extraction methods of creep and temperature effect were studied.The impact factor of temperature and deformation were determined with polynomial fitting.The results show that:The accuracy and effectiveness of the observation system satisfy the requirements;the bridge deck alignment is sensitive to the temperature change,the uneven settlement is great under low temperature,which decreases as the temperature rises;using the proposed creep analysis method,the relative creep deformation is only about 6%different from that of the theoretical value,which meets the computational precision requirements in engineering practice.

关 键 词：高速铁路 大跨度拱桥 混凝土拱桥 变形监测 徐变 

分 类 号：U446.2[建筑科学—桥梁与隧道工程]