In this work, the temperature response characteristics of thin-walled and large aspect ratio steel tubes under oil pool fire load conditions were studied. In order to obtain a reliable temperature distribution value, combustion tests were carried out in parallel with a numerical simulation study on Q345B steel circular tube members with the wall thickness of 5 mm. The circular tubes were tested under the thermal conditions which were induced by oil pool fire with the fuel of aviation kerosene in pan. Temperature versus time curves of the tube outer wall at different points were tested by integrated armored thermocouples, and a FLUKE® infrared thermal imager was used to record the surface temperature cloud map of the steel tube. ANSYS/FLUENT codes were used to model the heat transfer mechanism and the numerical results were in good agreement with the experimental results. The characteristics and rules of temperature responses of steel circular tube members under different fire source locations were analyzed. The results indicated that there exists a great non-uniform distribution of temperature in the radial direction of the tube member. The results of this study will provide further support for the prediction of the temperature response and mechanical behaviors of steel circular tube members s related to oil pool fire.

在这项工作中，研究了薄壁大纵横比钢管在油池着火条件下的温度响应特性。为了获得可靠的温度分布值，对壁厚为5 mm的Q345B钢圆管构件进行了数值模拟研究，并进行了燃烧试验。在油锅着火的情况下，用航空煤油在锅中引发的高温条件下对圆管进行了测试。通过集成铠装热电偶测试了管外壁在不同点的温度随时间变化的曲线，并使用FLUKE®红外热像仪记录了钢管的表面温度云图。ANSYS / FLUENT代码用于模拟传热机理，数值结果与实验结果吻合良好。分析了不同火源位置下圆形钢管构件的温度响应特性和规律。结果表明，在管件的径向上存在很大的温度不均匀分布。这项研究的结果将为与油池着火有关的圆形钢管构件的温度响应和力学行为的预测提供进一步的支持。结果表明，在管件的径向上存在很大的温度不均匀分布。这项研究的结果将为与油池着火有关的圆形钢管构件的温度响应和力学行为的预测提供进一步的支持。结果表明，在管件的径向上存在很大的温度不均匀分布。这项研究的结果将为与油池着火有关的圆形钢管构件的温度响应和力学行为的预测提供进一步的支持。