In order to determine the representative values of sunshine temperature differences of concrete single-box multi-cell box girders in different regions,outdoor sunshine temperature field test models were established in Shannan of Xizang,Tongchuan of Shaanxi and Laibin of Guangxi,respectively,and a large number of temperature sensors and meteorological collectors were installed at the same time.The meteorological variability in Shannan,Tongchuan and Laibin was summarized through the on-site measured data,and the formulae for calculating the temperature difference among box girders in Shannan,Tongchuan and Laibin were proposed through the step-by-step regression of the long-term box girder test temperature and the hour-by-hour meteorological data.The meteorological data from 1955 to 2016 in 6 prefecture-level cities in Xizang,10 prefecture-level cities in Shaanxi,and 14 prefecture-level cities in Guangxi were surveyed,and the daily meteorological data were decomposed into hour-by-hour meteorological data for the calculation of the temperature difference.Based on the suprathreshold distribution model,the representative values of the temperature action in three provinces with a reproduction period of 50 years were obtained,and the temperature action distribution maps were drawn.Research results show that the measured vertical temperature difference of sunny side web,vertical temperature difference of middle web,lateral temperature difference of top plate and lateral temperature difference of bottom plate of the box girder model are in descending order from Shannan,Tongchuan to Laibin,which shows that both the vertical and lateral temperature differences of box girders in different regions of China are differentiated by the influence of geographic location.The lateral temperature difference of the top plate of the concrete box girder in the sunny side is higher than that of the bottom plate,specifically by 30.7％,23.2％and 11.1％in Shannan,Tongchuan and Laibin,respectively.The vertical temperature difference of the middle web can reach up to 10.5 ℃ and the lateral temperature difference of the top plate can reach up to 20.3 ℃ in Xizang,Shaanxi and Guangxi,showing that the sunshine effect on concrete bridge varies significantly by region.3 tabs,32 figs,30 refs.
bridge engineeringconcrete box girdermodel testcomputation model of temperature differenceregional differencetemperature difference extremum
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