Observation and Research on Temperature Distribution in Steel Box Girders of Runyang Yangtse River Bridge

Based on the observation results of steel box girders of Runyang Cable-stayed Bridge and Runyang Suspension Bridge,temperature distributions in steel box girders subjected to sunshine were discussed.The differences in temperature distributions between the cable-stayed bridge and suspension bridge were presented in detail.The analysis results reveal that(1) the temperature difference in top plate in one day is larger than that of bottom plate and the temperature difference of suspension bridge is larger than that of the cable-stayed bridge;(2) the transverse temperature distributions in bottom plate are almost same and the temperature difference effect can be neglected;(3) the temperature distribution in top plate is nonlinear and nonstationary and the temperature distribution patterns in top plate of cable-stayed bridge and suspension bridge are distinctly different.The temperature distributions in steel box girders of Runyang Yangtse River Bridge can be used as a reference for the calculation of temperature effects of steel box girder and bridge deck surfacing design.