基于监测数据的钢桁梁桥温度变形研究  

THERMAL DEFORMATION OF A STEEL TRUSS BRIDGE BASED ON MONITORING DATA

作　　者：杨欣 张举兵 李小龙 何秋雨 李子欣 周毅 YANG Xin;ZHANG Ju-bing;LI Xiao-long;HE Qiu-yu;LI Zi-xin;ZHOU Yi(Research Institute of Urbanization and Urban Safety,School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100088,China;Shunde Innovation School,University of Science and Technology Beijing,Foshan 528399,China)

机构地区：[1]北京科技大学土木与资源工程学院,城镇化与城市安全研究院,北京100083 [2]中交公路规划设计院有限公司,北京100088 [3]北京科技大学顺德创新学院,佛山528399

出　　处：《工程力学》2024年第S01期310-316,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(52192662);佛山市科技创新专项资金项目(BK21BE014)。

摘　　要：温度的周期变化会使大跨度桥梁产生显著的结构变形。利用某三跨连续钢桁梁桥的现场监测数据,该文研究了支座纵向位移、主梁跨中挠度与结构温度变化的相关关系,并分析了现场实测结果与有限元模拟结果的差异。研究表明:与环境温度相比,背景桥梁的结构温度在白天更高,夜晚更低,变化幅度约是环境温度的2倍。由于不受日照辐射影响,结构温度在夜间的分布比白天更为均匀。结构温度变化对背景桥梁的支座纵向位移有显著影响,而对主梁跨中挠度影响较小,且支座摩阻力使左右边墩支座表现出不同的运动模式。在短如一天的时间尺度上,支座位移与结构温度表现出滞回关系。这种非线性现象可能与支座处的摩阻力和时变非均匀温度变化有关。The periodic change of temperature will cause significant structural deformation of long-span bridges.Based on the field monitoring data of a three-span continuous beam bridge,this study investigates the temperature dependencies of the longitudinal displacements of bearings and the mid-span deflection of the girder.The field measurements are compared against the finite element analysis results,and the discrepancies are further discussed and explored in a qualitative way.The key findings of this study are as follows:Compared with the ambient temperature,the structural temperature of the background bridge is high during the daytime and low at night,with a variation amplitude approximately twice that of the ambient temperature.The temperature distribution across the bridge is relatively uniform at night due to the lack of solar radiation.The structural temperature change has more influence on the longitudinal displacement of the bearings than on the mid-span deflection of the truss girder.The frictional resistance results in different thermal motion patterns of the bearings at the left&right side piers.On a time scale as short as one day,the bearing displacements exhibit a hysteresis relationship with the structural temperature.This nonlinear phenomenon may be attributed to the bearing friction and the time-varying non-uniform temperature changes.

关 键 词：钢桁架桥 温度分布 支座位移 摩阻力 滞回效应 

分 类 号：U446[建筑科学—桥梁与隧道工程] TU441.5[交通运输工程—道路与铁道工程]