无铺装PK断面组合梁温差取值分区研究  

Zoning of temperature difference value of composite beam with PK section without pavement

作　　者：张玉平[1] 谢俊良 ZHANG Yuping;XIE Juniang(School of Civil and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木与环境工程学院,湖南长沙410114

出　　处：《交通科学与工程》2025年第2期121-130,共10页Journal of Transport Science and Engineering

基　　金：国家重点基础研究发展计划(973计划)(2015CB057702);国家自然科学基金资助项目(52078059);湖南省教育厅创新平台资助项目(16K005)。

摘　　要：【目的目的】研究施工阶段无铺装PK断面钢-混组合梁竖向温度梯度中的温差取值,为工程设计与施工提供科学依据。【方法方法】对广东省江门市某桥施工阶段组合梁进行温度场有限元数值模拟和实桥测试,基于夏季晴天和日照时数长的多云天气的气象参数进行数值模拟以获得日最大竖向正温差数据,对模拟数据进行统计分析,采用指数函数描述竖向正温度梯度分布曲线,并基于纬度、海拔和年最高气温对应的日温差三个气象参数提出竖向正温差标准值预测公式,最后根据全国235座城市的预测结果进行温差取值分区。【结果结果】数值计算结果与实测结果吻合较好;日最大竖向正温差数据服从广义极值分布,以50年重现期为标准得到的竖向正温差标准值为14.946℃;提出的预测公式能准确反映竖向正温差标准值的变化规律;根据预测结果,将中国划分为3个区域进行温差取值,每个区域的取值分别为14、16、18℃。【结论结论】提出的竖向正温差标准值预测公式和温差取值分区适用于无铺装PK断面的组合梁,为工程设计与施工提供了可靠的参考依据。。[Purposes]This paper carried out research on temperature difference value in vertical temperature gradient of steel-concrete composite beams with PK section without pavement during construction to provide a scientific basis for engineering design and construction.[Methods]Finite element numerical simulation and a real bridge test in temperature field were conducted on the composite beam of a bridge in the construction stage in Jiangmen City,Guangdong Province.Based on meteorological parameters on sunny days and cloudy days with long sunshine duration in summer,numerical simulation was carried out to obtain daily maximum vertical positive temperature difference data.Statistical analysis was made on simulation data,and an exponential function was used to describe the vertical positive temperature gradient distribution curve.Using three meteorological parameters of latitude,elevation,and the diurnal temperature range corresponding to the annual maximum temperature,the paper proposed a prediction formula for the standard value of vertical positive temperature difference.Finally,zoning of temperature difference value was conducted according to the predicted results for 235 cities across China.[Findings]The numerical results agree well with the measured data.The daily maximum vertical positive temperature difference data obey the generalized extreme value distribution.Taking the 50-year return period as the standard,the standard value of vertical positive temperature difference is 14.946°C.The proposed prediction formula can accurately reflect the change law of the standard value of vertical positive temperature difference.According to the prediction results,China is divided into 3 regions for temperature difference values.The values for the three zones are 14°C,16°C,and 18°C.[Conclusions]The proposed prediction formula for the standard value of vertical positive temperature difference and zoning of temperature difference value are suitable for composite beams with PK section without pavement.This research provides

关 键 词：桥梁工程 组合梁 PK断面 温度梯度 气象参数 温差标准值 温度作用分区 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]