The temperature field and its effect are important issues related to the design and construction of bridges. For steel–concrete composite bridges, the huge difference in thermal performance between steel and concrete makes the temperature field distribution and variation more complicated. In this paper, an indoor baking lamp radiation experiment with controllable parameters is carried out on a group of two steel–concrete composite beam specimens for the study of temperature field. The temperature time-history and distribution laws of the specimen during heating and cooling process are observed and analyzed. Furthermore, a refined numerical model of the solar temperature field of the composite bridge is established and verified by the baking lamp radiation experiment. The proposed refined numerical model of the temperature field of the steel–concrete composite bridge realizes the temperature field analysis of various cross-sections of composite bridges and can automatically consider the shielding effect of the flange on the web, providing a useful tool for the modeling of and analysis of the temperature field of composite bridges.

温度场及其影响是与桥梁设计和施工有关的重要问题。对于钢混凝土组合桥，钢和混凝土之间的热性能差异很大，因此温度场的分布和变化更加复杂。在本文中，对一组两个钢-混凝土组合梁样本进行了参数可控的室内烘烤灯辐射实验，以研究温度场。观察和分析了样品在加热和冷却过程中的温度时程和分布规律。此外，建立了复合桥太阳温度场的精确数值模型，并通过烘烤灯辐射实验进行了验证。