基于协同克里金方法的环境温度分布对装配式小箱梁桥影响分析

Analysis of Environmental Temperature Distribution and Its Influence on Composite Box Girder Bridge Based on the Co-Kriging Method

为研究区域环境温度分布及其对装配式小箱梁桥梯度温度影响,以江苏地区为例,采用协同克里金法在考虑高程的条件下对2016年和2017年全国2339个气象台站的逐日气温数据进行了不同气温分布插值分析,同时通过装配式小箱梁桥温度场实测试验验证,分析了环境温度与箱梁内梯度温度之间的关系。结果表明:1)江苏省内冬季平均气温南北地区的最大差异为5℃左右,日极值温差的南北地区差异为3.5℃;2)环境最高气温与箱梁梯度温度高低的相关性最高,据此,可通过环境日最高温度大致预测不同地区箱梁内梯度温度最大值。

In order to study the regional environmental temperature distribution and its influence on the gradient temperature of composite box girder bridge,this paper takes Jiangsu area as an example,the temperature distribution in Jiangsu Province was interpolated and analyzed using the Co-Kriging method considering the elevation based on the daily temperature data of 2339 meteorological stations in 2016 and 2017.At the same time,based on the temperature field test of composite box girder bridge,the relationship between the ambient temperature and the gradient temperature in the box girder is analyzed.The main conclusions are as follows:the maximum difference of average temperature between the south and north areas of Jiangsu province in winter is about 5℃,and the regional difference of daily extreme temperature difference is 3.5℃.The maximum ambient temperature has the highest correlation with the gradient temperature of the box girder,which can be used to roughly predict the maximum gradient temperature in different areas.