关键词: 桥面温度, 路面温度, 差异性, BP神经网络, 线性回归

Abstract:

Studying the characteristics of temperature differences on bridge decks and their prediction models can provide decision-making basis for traffic management departments to predict severe weather and reduce traffic accidents. Based on observation data from three traffic meteorological stations on the Tianxingzhou Bridge section in Wuhan over the past three years, including the minimum temperature, air temperature, wind speed, precipitation, etc., for every five minutes, the daily differences in the minimum temperature between the bridge deck and the road surface, the hourly variation characteristics of typical weather cases, and the temperature change patterns under different weather conditions are analyzed. The prediction models for the minimum temperature of the bridge deck are established by using multiple linear regression and BP (Back Propagation) neural network methods, and the models are driven and tested using intelligent grid minimum temperature prediction products. The results indicate that due to differences in engineering structure, pavement material, geographical environment, and environmental meteorological factors, the temperature of the bridge deck is usually lower than that of the pavement, and the temperature difference between the two is the largest under sunny conditions. The speed at which the temperature on the bridge deck drops below freezing point is faster, and the duration of low temperature maintenance is longer. Both multiple linear regression and BP neural network methods can achieve good prediction results. Among them, BP method is more suitable for scenarios that require high prediction accuracy, while multiple linear regression method is suitable for applications that require high prediction accuracy.

Key words: bridge deck temperature, road surface temperature, differences, BP neural network, linear regression