摘要
针对公路规范未给出桥梁高墩温度模式问题,依据太阳辐射理论探讨高墩与外界环境热交换机理,考虑太阳辐射、辐射换热、对流换热确定结构热边界条件,以莆炎高速公路奇韬溪大桥项目为依托,采用ANSYS软件建立薄壁空心高墩三维仿真模型进行墩温度场与温度效应分析.结果表明:薄壁空心墩与箱梁温度场分布存在一定差异,不应直接套用公路桥涵通用设计规范中箱梁温度梯度模式.高墩温度场表现出随太阳东升西落的正弦曲线变化规律,高墩外表面场温度分布主要受日照控制.温度效应对高墩线形的影响不可忽略,墩顶支座对温差作用下墩顶位移约束效果显著,在支座约束下最大位移降低幅度达53%.
In view of the problem that the temperature model of bridge high pier is not given in the highway code,the heat exchange mechanism between the high pier and the external environment is discussed based on the solar radiation theory,and the thermal boundary conditions of the structure are determined by considering solar radiation,radiation heat transfer and convective heat transfer. Relying on the Puyan Expressway Qitaoxi Bridge Project,ANSYS software is used to establish a three-dimensional simulation model of the thin-walled hollow high pier to analyze the temperature field and temperature effect of the pier. The results show that there is a certain difference in the temperature field distribution of the thin-walled hollow pier and the box girder,so the box girder temperature gradient mode in the general design code for highway bridges and culverts should not be directly applied. The temperature field of the high pier shows a sinusoidal curve with the sun rising in the east and setting in the west,and the temperature distribution of the external surface field of the high pier is mainly controlled by sunlight. The influence of temperature effect on the linear shape of the high pier cannot be ignored. The pier top support has a significant constraint effect on the displacement of the pier top under the action of temperature difference,and the maximum displacement is reduced by53% under the constraint of the support.
作者
毕志刚
闫向君
禹彦杰
梁斌
BI Zhigang;YAN Xiangjun;YU Yanjie;LIANG Bin(The First Engineering Co.Ltd.,China Railway Construction 15th Bureau Group,Xi’an 710018,China;School of Civil Engineering,Henan University of Science and Technology,Luoyang 471023,Henan China)
出处
《河南科学》
2022年第1期46-53,共8页
Henan Science
基金
国家自然科学基金项目(U1604135)
中铁十五局集团重点科研项目(2018B3)
河南省科技厅产学研合作项目(2015HNCXY011)。
关键词
桥梁工程
薄壁空心高墩
太阳辐射
温度场
温度效应
bridge engineering
thin-walled hollow high pier
solar radiation
temperature field
temperature effect
