Натурні визначення розподілу температури по висоті залізобетонної балки

Problem. Due to rapid global climate changes and increasing of annual air temperatures, the problem of the thermal effects on bridge elements is becoming more relevant. Eigenstresses and strains in the elements of superstructure of the bridge with increasing temperature become significant and can affect the performance characteristics of both span superstructure and the entire bridge. Goal. This article presents the results of field research of temperature distribution over the height of concrete beam of one of the bridges during daylight hours. Methodology. The measurement and recording of beam surface temperature values was performed at four points located along the height of the beam. Temperature values were measured using K-type thermocouples, which were connected to a temperature logger that recorded these values. Results. The obtained data illustrate the beam temperature changes during part of the daily cycle of heating/cooling. The results also show significant differences in the temperature of the surface of the beam, reaching a maximum of 7,7⁰С. The Data also show a significant influence of the wind on the surface temperature of the beam and, as a result, on its stress-strain state. Originality. As we are facing a global climate change, we must acknowledge its impact on the approach to bridge design and maintenance. The almost complete lack of information about the temperature of bridge elements in Ukraine makes it difficult to predict such temperature effects in Ukrainian climate conditions. Practical value. Collecting and analyzing field data of the temperature differences in bridge elements can help to predict thermal effect on them in terms of climate changes even at the design stage.