摘要
研究目的:西部山区太阳辐射强烈,大跨上承式拱桥拱肋因桥面系遮挡程度不同,易形成非均匀温度场,给桥梁结构设计以及运营维护带来一定困难。本文以郑渝高铁奉节梅溪河双线特大桥为工程依托,基于桥梁健康监测系统获取的实测温度数据,采用回归分析方法,开展混凝土拱肋纵向温度分布规律研究。研究结论:(1)拱肋顶板沿桥梁纵向存在显著的温度分布差异,其温度分布呈“V”形特征,拱顶区域温度最低,由拱顶向两端拱脚方向,温度逐渐升高,最大纵向温差达4.6℃;(2)腹板和底板的纵向温差较小,可视为均匀分布,左侧腹板纵向最大温差为1.4℃,右侧为0.5℃;由于底板位置终日不受太阳辐射的直接影响,其纵向温度分布较为均匀,最大温差为0.7℃;(3)拱肋顶板纵向温差分布可采用指数函数形式进行表征,推荐模型参数(沿拱肋纵向最大温差T0、温差衰减系数α)分别为4.2℃、-0.012与3.5℃、-0.01,该模型在不同观测时段均表现出较高的拟合精度,能有效反映拱肋顶板纵向温度分布特性,具有工程应用价值;(4)本研究成果可为类似桥梁的温度效应分析及结构性能评估提供理论支撑。
Research purposes:Intense solar radiation in western mountainous regions caused longitudinally non-uniform temperature fields in the arch ribs of large-span deck-type arch bridges due to varying degrees of shading by the bridge deck system.This phenomenon brought challenges to structural design and operational maintenance.Based on the Fengjie Meixi River double-track arch bridge,temperature data were obtained from a bridge health monitoring system.Regression analysis was employed to investigate the longitudinal temperature distribution of box-section concrete arch ribs.Research conclusions:(1)There is a significant temperature distribution difference along the longitudinal direction of the arch rib top plate,which presents a"V"shape.The temperature at the arch top is the lowest,and it gradually increases from the arch top to the arch feet at both ends.The maximum longitudinal temperature difference reaches 4.6℃.(2)The longitudinal temperature differences of the web plates and bottom plate are relatively small and can be regarded as uniform distribution.The maximum longitudinal temperature difference of the left web plate is 1.4℃,and that of the right one is 0.5℃.As the bottom plate is not directly exposed to solar radiation throughout the day,its longitudinal temperature distribution is relatively uniform,with a maximum temperature difference of 0.7℃.(3)The longitudinal temperature difference distribution of the arch rib top plate can be characterized by an exponential function form.The recommended model parameters are(4.2℃,-0.012)and(3.5℃,-0.01).This model shows high fitting accuracy in different observation periods and can effectively reflect the longitudinal temperature distribution characteristics of the arch rib top plate,having engineering application value.(4)The research results can provide theoretical support for the temperature effect analysis and structural performance evaluation of similar bridges.
作者
陈克坚
杨国静
彭桂卿
CHEN Kejian;YANG Guojing;PENG Guiqing(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)
出处
《铁道工程学报》
北大核心
2025年第8期49-54,共6页
Journal of Railway Engineering Society
基金
中国中铁股份公司重点课题(2025-重大-10)
中铁二院工程集团有限责任公司科研项目(KSNQ233016)。
关键词
铁路桥梁
温度场
回归分析
混凝土拱肋
上承式拱桥
西部地区
railway bridge
temperature field
regression analysis
concrete arch rib
deck arch bridge
western region
作者简介
陈克坚,1966年出生,男,教授级高级工程师。
