张靖皋长江大桥日照作用下组合结构桥塔温度效应研究  

Research on Temperature Effect of Composite Bridge Tower in Zhang-Jing-Gao Yangtze River Bridge Under Solar Radiation

作　　者：刘宇飞[1,2] 张寒硕 王仁贵[3] 魏乐永[3] 聂鑫[1,2] 樊健生[1,2] LIU Yu-fei;ZHANG Han-shuo;WANG Ren-gui;WEI Le-yong;NIE Xin;FAN Jian-sheng(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education,Tsinghua University,Beijing 100084,China;CCCC Highway Consultants Co.Ltd.,Beijing 100088,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [3]中交公路规划设计院有限公司,北京100088

出　　处：《中国公路学报》2024年第7期125-136,共12页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52121005,52192662)。

摘　　要：温度效应对于桥梁结构安全使用具有重要影响,也经常成为组合结构桥梁设计中的控制因素。为探究桥塔在服役阶段受到的日照温度效应影响,推动组合结构桥梁设计方法进步,以张靖皋长江大桥钢箱-钢管约束混凝土桥塔为例,对其开展试验与模拟研究。首先,开展桥塔结构缩尺模型暴晒试验,测量晴朗天气下的结构关键位置温度与脱空结果,得到该结构在日照辐射作用下的温度场基本分布与变化规律,并通过有限元温度场计算方法模拟再现了暴晒试验中的温度结果。试验结果表明:外部钢箱对内部的受力结构起到了温度保护效应,避免了日照导致的钢管混凝土界面脱空,有限元计算结果与试验数据基本吻合,从而验证了有限元分析方法的有效性。其次,建立实际索塔结构的整体模型,分析并提取了实际结构在夏至日和冬至日的日照轨迹、温度时程与温度分布结果,并对截面两侧的温度差值进行了双因素的综合敏感性分析。结果表明:在一天中随着日照方向的不断变化,桥塔不同方向的钢箱壁板会轮流升温,内部的钢管混凝土结构温度主要与环境温度相关。再次,总结出了钢箱-钢管约束混凝土组合桥塔的温度梯度模式,采用多段折线的方式进行简化分析。最后,基于以上日照温度效应的分析,给出了面向组合结构桥梁设计阶段的几点建议。Temperature significantly affects the safety of bridge structures and is usually a controlling factor in the design of composite bridges.To examine the influence of solar temperature on bridge towers and develop a structural design method for a composite bridge,experimental and simulation analyses are conducted in this study considering the steel-box-CFST bridge tower of the Zhangjinggao Yangtze River Bridge.First,the bridge tower structural model is exposed to solar radiation.The temperatures at key positions and interface voids in the concrete-filled steel tubes(CFSTs)are measured.Then,the distribution law and time history of the temperature field are obtained.The experimental temperature results are simulated using a finite element model.As a result,the external steel box protects the internal structure from radiation and avoids interface voids caused by sunshine.The finite element calculation results are consistent with the experimental results,verifying the calculation method of the model.Second,a model of the entire tower is established,and the sunshine trajectory,temperature time history,and temperature distribution of the actual structure on summer and winter solstice days are analyzed.Sensitivity analyses of the two factors are also performed on the temperature difference between the two sides of the section.The results show that the steel box in different directions of the bridge tower heats up with the change in the solar direction in one day,and the internal temperature of the CFSTs is mainly related to the ambient temperature.Third,the temperature gradient mode of the steel box-CFST section is summarized as multilinear lines.Finally,based on the above analysis of the solar temperature effect,some suggestions for composite-structure bridge design are provided herein.

关 键 词：桥梁工程 钢-混凝土组合桥塔 数值模拟 温度效应 日照辐射 温度梯度 

分 类 号：U441[建筑科学—桥梁与隧道工程]