新型波形钢腹板组合箱梁桥温度效应研究  

Research on thermal effect of new-pattern corrugated steel web composite box girder bridge

作　　者：王力[1] 牛思胜[2] 刘世忠[1] 丁万鹏 路韡[1] WANG Li;NIU Sisheng;LIU Shizhong;DING Wanpeng;LU Wei(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Provincial Department of Transportation,Lanzhou 730030,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]甘肃省交通运输厅,甘肃兰州730030

出　　处：《铁道科学与工程学报》2020年第8期2021-2029,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51868040,51568036)。

摘　　要：针对我国刚刚兴起的新型波形钢腹板组合梁桥建设,其日照温度效应已经受到国内学者的日益重视。以某高速公路上一座新型波形钢腹板组合箱梁桥为工程背景,对2个波形钢腹板箱梁截面展开温度场现场实测,研究其日照温度场分布特征。并借助有限元软件对比分析了实测、规范温度场作用下的箱梁温度响应。结果表明:现场实测混凝土顶板与腹板接触区域存在一定温差,实测温度场与现行《规范》相关规定具有明显差异;由于顶、腹板接触局部的温差,在竖、横向实测二维温度梯度模式下,箱梁混凝土顶板上缘横向拉应力最大达1.02 MPa。温度变形引起的主拉应力极有可能导致顶板的纵桥向开裂,设计中应引起重视。In view of the construction of a new type of steel bottom plate CSW composite girder bridge in China,the temperature effect has been paid more and more attention by domestic scholars.In this paper,taking a new-pattern CSW box girder bridge on a highway as the engineering background,The temperature field of two corrugated steel webs box girders was measured in situ,and the distribution characteristics of sunshine temperature field were studied.Finally,the temperature response of box girder under the action of standard temperature field is analyzed by the comparison of the finite element software.The results show that there is a certain temperature difference between the concrete top plate and the contact area of the web,and the measured temperature field is obviously different from the relevant provisions of the current.Due to the temperature difference between the roof and the web,in the vertical and transverse measured two-dimensional temperature gradient mode,the transverse tensile stress of the upper edge of the top of the box girder concrete roof is up to 1.02 MPa.The main tensile stress caused by the temperature deformation is most likely to cause the longitudinal bridge of the top plate to crack,and attention should be paid to the design.

关 键 词：波形钢腹板 组合箱梁 温度场分布 有限元 温度应力 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]