华南地区跨海钢箱梁桥日照温度梯度分析  

Analysis of Daylight Temperature Gradient in South China Sea Steel Box Girder Bridges

作　　者：温佳海 刘建 WEN Jiahai;LIU Jian

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《重庆建筑》2025年第2期93-97,共5页Chongqing Architecture

摘　　要：目前,JTG D60—2015《公路桥涵设计通用规范》对于无铺装钢箱梁和采用钢纤维混凝土和沥青混凝土作为铺装层的钢箱梁未明确具体竖向温度梯度模式,因此无法计算出上述两种工况下钢箱梁的温度作用。对上述两种工况的温度梯度模式进行研究,作为后续规范编制和同类工程桥梁温度作用计算的参考依据。以华南地区某跨海通道60 m非通航连续钢箱梁桥作为研究对象,首先,以现场温度实测和有限元仿真分析作为研究手段,对比了钢箱梁各测点的实测温度数据与有限元仿真结果,发现两者随时间的变化情况和数值大小都非常接近,表明现场实测和有限元仿真分析都是研究钢箱梁温度场问题的有效方法;其次,以实测温度数据为基础,对钢箱梁上述两种工况的日照温度梯度用指数函数的形式进行拟合,拟合后两种工况的最大正温差分别为25.2℃和10.8℃;最后,参考英国BS5400桥梁规范将拟合后的曲线形温度梯度简化成四段折线形形式,以适用于Midas Civil的应用。At present,JTG D60-2015 General Specification for Highway Bridge and Culvert Design does not specify the specific vertical temperature gradient mode for unpaved steel box girders and steel box girders using steel fiber concrete and asphalt concrete as the paving layer,so the temperature effect of steel box girders can not be calculated for the above two working conditions.The temperature gradient patterns of the above two conditions are studied as a reference basis for subsequent specification preparation and calculation of the temperature action of bridges of similar projects.Taking a 60 m non-navigable continuous steel box girder bridge of a sea-crossing passage in South China as the research object,firstly,the on-site temperature measurement and finite element simulation analysis are used as the research means,and the measured temperature data of each measurement point of the steel box girder are compared with the results of finite element simulation,and it is found that the changes over time and the magnitude of the two are very close to each other,which indicates that the on-site measurement and the finite element simulation analysis are effective methods for the research of the temperature field of steel box girder.Secondly,based on the measured temperature data,the sunshine temperature gradient of the above two conditions of the steel box girder is fitted in the form of exponential function,and the maximum positive temperature difference between the two conditions is 25.2℃and 10.8℃respectively;finally,the fitted curvilinear temperature gradient is simplified into a four-segment folded form with reference to the BS5400 Bridge Specification of the United Kingdom,which is suitable for the Midas.Finally,the fitted curvilinear temperature gradient is simplified to a four-segment folded form with reference to the British BS5400 Bridge Specification for Midas Civil application.

关 键 词：钢箱梁 温度场 铺装层 温度梯度模式 有限元分析 拟合 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]