Abstract
This paper describes the construction and instrumentation of an experimental box-girder segment, aiming to analyze the temperature distributions in concrete bridges under the fluctuation of air temperature and solar radiation thermal loads. The instrumentation included air temperature, solar radiation, and wind speed sensors in addition to 62 thermocouples, while data acquisition continued for more than one year. The maximum vertical temperature gradient was recorded in June, while the maximum lateral gradient was recorded in December. Empirical formulas were proposed to predict the maximum vertical and lateral temperature gradients, in addition to the daily maximum and minimum mean temperatures of the bridge.
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