沁河特大桥钢混组合梁日照温度效应研究  

Research on the temperature effects of sunlight on the steel-concrete composite beam of the Qinhe grand bridge

作　　者：彭伟 王艳明 朱帅通 马峰 李文杰[2] PENG Wei;WANG Yanming;ZHU Shuaitong;MA Feng;LI Wenjie(CCCC-SHEC Forth Engineering Co.,Ltd.,Henan Luoyang 471013,China;School of Civil and Architecture,Henan University of Science and Technology,Henan Luoyang 471000,China)

机构地区：[1]中交二公局第四工程有限公司,河南洛阳471013 [2]河南科技大学土木建筑学院,河南洛阳471000

出　　处：《低温建筑技术》2024年第11期53-57,共5页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(U1604135);中交二公局有限公司重点科研项目(2022X-2-7);河南省科技厅产学研合作项目(2015HNCXY011)。

摘　　要：文中为研究日照作用下山区大跨径钢-混组合梁桥温度场分布与温度效应,对沿太行山高速沁河特大桥钢-混组合梁温度场进行现场监测与分析。使用最小二乘法对截面竖向最不利温度梯度进行拟合,采用Midas-Civil软件分析实测温度梯度作用下桥梁力学特性,并提出现场施工控制措施。研究结果表明,日照作用下组合梁温度变化为升降温两阶段,箱室内日气温变化规律符合正弦函数,竖向温度梯度分布符合线性与指数函数组成的分段函数。实测温度梯度作用下钢梁最大拉压应力分别为18 MPa与-5 MPa,桥面板最大拉压应力分别为0.93 MPa与-1.58 MPa,最大竖向与顺桥向位移分别为3.6 mm与10.4 mm。现场施工控制措施效果良好,研究内容与现场控制措施可为后续桥梁温度效应研究提供参考。To investigate the temperature field distribution and temperature effects of large-span steel-concrete composite beam bridges under sunlight in mountainous areas,this study conducts on-site monitoring and analysis of the temperature field along the Qinhe Grand Bridge in the Taihang Mountains.The least squares method is used to fit the most unfavorable vertical temperature gradient across the section,and Midas-Civil software is employed to analyze the mechanical characteristics of the bridge under the measured temperature gradient,along with proposing control measures for on-site construction.The results indicate that the temperature variation of the composite beam under sunlight occurs in two phases:heating and cooling.The temperature variation inside the box chamber follows a sinusoidal function,while the vertical temperature gradient distribution can be represented by a piecewise function composed of linear and exponential functions.Under the measured temperature gradient,the maximum tensile and compressive stresses in the steel beam are 18 MPa and-5 MPa,respectively,while the maximum tensile and compressive stresses in the bridge deck are 0.93 MPa and-1.58 MPa,respectively.The maximum vertical and longitudinal displacements are 3.6 mm and 10.4 mm,respectively.The on-site construction control measures have shown good effectiveness.The findings and control measures proposed in this study can provide valuable references for future research on temperature effects in bridges.

关 键 词：大跨径钢-混组合梁桥 日照温度场 竖向温度梯度 温度效应 

分 类 号：TU398[建筑科学—结构工程]