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利用自制火灾试验炉及相关试验装置对足尺钢框架中6块(2?3)连续板格的受火行为进行了试验研究。简要介绍了整体结构模型、试验炉设计与试验方案情况,描述了相关试验现象及破坏特征,并对炉温、板格沿截面的温度梯度以及板格平面外与平面内位移、梁截面的温度梯度及竖向挠度等试验数据进行了分析。相关结论如下:升温阶段受火板格沿截面存在着显著的温度梯度并在降温阶段存在温度滞后现象;受火钢梁截面在升温阶段初期存在较大的温度梯度,在降温阶段趋于一致,并由于周边约束未发生断裂或局部屈曲,对比标准受火试验,抗火性能显著增强;不同位置的板格由于约束程度的差别,在火灾中的变形性能也不同;由于受火钢梁的反拱效应,受火板格的部分挠度曲线存在平稳段;对比相关文献结果,发现板格的裂缝特征与其受火强度和边界约束密切相关,与周围钢梁是否受火关系不大。
The fire behaviors of 6 (2? 3) continuous slab in full-scale steel frame were tested by self-made fire test furnace and related test equipment. The overall structural model, the design of the test furnace and the experimental scheme are briefly introduced. The related test phenomena and the characteristics of the failure are described. The influences of the furnace temperature, the temperature gradient along the section of the plate and the plane and out-plane displacements of the plate, Gradient and vertical deflection test data were analyzed. The relevant conclusions are as follows: There are significant temperature gradients along the cross-section of the fireplates in the heating stage and the temperature lag in the cooling stage. The temperature gradient of the section of the steel beams exposed to fire in the early stage of the warming stage tends to be consistent, Compared with the standard fire test, the fire resistance performance is significantly enhanced because of the restraint of peripheral restraint or the local buckling, and the deformation performance of fire slab in different positions is also different. The arch effect and the partial deflection curve of the fireplated panel have stable sections. Comparing the relevant literature results, it is found that the crack characteristics of the panel are closely related to the fire intensity and the boundary constraints, but not to the surrounding steel beams.