Abstract: In order to investigate the non-uniform temperature field of the steel truss cable-stayed bridge with two-layer decks under solar radiation, a numerical simulation method of temperature field of the steel truss cable-stayed bridge with two-layer decks under solar radiation was developed, which considered geographical meteorological factors and the occlusion relationships between various components. The method was validated through experimental data. Taking Jinan Yellow River Highway Bridge expansion project, with a main span of 488 meters in Shandong Province, as a case study, a three-dimensional heat conduction model was established by ABAQUS software. The effects of occlusion on the temperature distribution of bridge and the temperature distribution patterns along the horizontal and vertical directions of the steel truss surface under typical seasonal conditions were analyzed. The results show that the temperature time-history simulated by finite element agrees well with the experimental values, validating the accuracy and reliability of the numerical simulation method. Under solar radiation, the surface temperature field of the steel truss cable-stayed bridge with two-layer decks exhibits significant time-varying characteristics and spatial non-uniformity. Due to occlusion from the upper deck, the vertical temperature difference of the steel truss structure can reach 23.0 ℃ in summer, and the occlusion effect on the temperature distribution of the bridge surface is non-negligible.

Key words: bridge engineering; steel truss cable-stayed bridge with two-layer decks; heat transfer analysis; temperature field considering solar radiation; occlusion effect

摘要： 为探究双层桥面钢桁梁斜拉桥在日照作用下的非均匀温度场，建立了考虑地理气象因素以及各构件之间遮挡关系的双层桥面钢桁梁斜拉桥日照温度场数值模拟方法，并通过试验数据进行了验证。以山东地区主跨488 m的济南黄河公路大桥扩建项目为背景，利用ABAQUS软件建立三维热传导模型，分析了遮挡作用对桥梁温度分布造成的影响，及典型季节下钢桁梁表面横竖向的温度分布规律。结果表明：有限元模拟的温度时程与试验值吻合良好，验证了模拟方法的精度和可靠性；日照作用下，双层桥面钢桁梁斜拉桥表面温度场呈现出明显的时变特征以及空间非均匀性；受上层桥面遮挡，钢桁梁结构的竖向温差在夏季可以达到23.0 ℃，遮挡作用对桥梁表面温度分布的影响不可忽略。

关键词: 桥梁工程；双层桥面钢桁梁斜拉桥；传热分析；日照温度场；遮挡作用