考虑桥轴线方位角影响的曲线箱梁日照温差效应  

Sunshine Temperature Difference Effects of Curved Box Girder Considering the Influence of Azimuth of Bridge Axis

作　　者：闫兴非 周良 李群锋 张涛 YAN Xingfei;ZHOU Liang;LI Qunfeng;ZHANG Tao(Shanghai Urban Construction Design and Research Institute,Shanghai 200125,China;Shanghai Engineering Research Center of Industrialized and Prefabricated Municipal Civil Engineering,Shanghai 200125,China;Shanxi Provincial Transportation Research Institute,Taiyuan,Shanxi 030032,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125 [2]上海工业化装配化市政工程技术研究中心,上海200125 [3]山西省交通规划勘察设计院有限公司,太原030032

出　　处：《结构工程师》2022年第2期31-40,共10页Structural Engineers

基　　金：上海市科委(17DZ2251900);上海市科委(19XD1432400);住房和城乡建设部(2018-K9-039)。

摘　　要：针对公路曲线箱梁桥日照温差效应问题,在简要介绍箱梁温度边界计算方法的基础上,基于Visual C++编制了考虑桥梁方位角影响的曲线箱梁桥日照温差温度场计算程序,以一公路曲线梁桥为例,进行了考虑桥梁轴线方位角影响的曲线梁桥日照温差效应计算,与现行规范方法计算结果进行了比较。结果表明:由于曲率和桥轴线方位角共同影响,曲线箱梁桥在日照温差作用下会同时发生径向和轴向位移,边跨跨中与中跨跨中竖向位移方向相反;顶板内外侧应力分布沿桥轴线方向变化较小,而底板内外侧应力分布沿桥轴线走向变化相对较大。采用本文计算方法所得结果除曲线梁顶、底板表面节点应力计算结果与按规范方法计算结果偏差较大外,位移、扭转角以及截面内部节点应力计算结果与按规范方法计算结果总体较为吻合。Aiming at the problem of sunshine temperature difference effects of curved box girder highway bridges,based on the brief introduction of the calculation method of box girder temperature boundary,the calculation program of sunshine temperature difference temperature of box girder bridges considering the influence of azimuth of bridge axis is developed based on Visual C++.A curved box girder bridge is taken as an example to calculate the sunshine temperature difference effect,and compared with the current design code for highway bridges method.The results show that,due to the joint effects of curvature and azimuth of the bridge axis,the curved box girder bridge will have radial and axial displacements at the same time under the effect of sunshine temperature difference,and the vertical displacement direction of the middle of the central span and the middle of the side span is opposite.The stress distribution on the top of main deck changes little along the axis of the bridge,while the stress distribution at the bottom of the main deck changes relatively large along the axis of the bridge.Except for the calculation results of the stress at the top and bottom deviated from the calculation results according to the code method,the results obtained by the calculation method of this paper,namely the displacement,the torsion angle and the internal joint stress of the section,are generally consistent with the calculation results according to the code method.

关 键 词：曲线箱梁 桥轴线方位角 日照温差 温度梯度 热-结构耦合分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]