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对池火灾下未采取防护措施的6层钢交错桁架体系(SSTS)的1/8缩尺模型的力学性能和失效模式进行了试验研究,获得了典型构件的温度分布、位移和应变的数据。结果显示:随着温度的升高,火灾下空腹桁架中垂直的腹板首先出现局部屈曲,这导致内力的初平衡被破坏。之后,火灾下桁架中的弦杆与对角腹板的几个节点断裂。观察火灾下桁架发生的灾难性破坏可以推断,火灾下桁架的破坏可能导致由此桁架支撑的两个楼层发生倒塌,进而引起整个结构倒塌的巨大灾害。
The mechanical properties and failure modes of a 1/8 scale model of a 6-story staggered-truss system (SSTS) without protective measures under a pool fire were tested and the data of temperature distribution, displacement and strain of typical components were obtained. The results show that with the increase of temperature, the local buckling of the vertical web in the fasting truss under fire first occurs, which leads to the destruction of the initial balance of internal forces. After that, several chords in the truss under fire and diagonal webs were broken. Observing the catastrophic failure of a truss in a fire, it can be inferred that the destruction of the truss in the event of a fire could lead to the collapse of two floors supported by the truss, which in turn caused a massive collapse of the entire structure.