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本文基于建筑通风因素对世贸中心塔楼钢桁架构件在火灾中的温度做了计算。用 CIB相关性研究火灾。传热分析考虑了钢材和耐火保护材料的各种性质。本文提出了一种基于桁架杆件杨氏模量降低而发生压缩弯曲的结构破坏模式 ,计算所得两塔楼楼层估计破坏或开始塌陷的时间分别为 :北楼(WTC1) 10 5± 2 0 min,南楼 (WTC2 ) 5 1± 9min,与飞机撞击后两楼实际坍塌时间 10 4 min和 5 6 min相当吻合。看来 ,耐火保护层的厚度及其在两楼中分别为 38.1mm和 19.1mm的差别对两塔楼的坍塌有着根本性的影响。
This article calculates the temperature of the steel truss component of the tower in the fire based on the building ventilation. Study the fire with CIB relevance. Heat transfer analysis takes into account the various properties of steel and refractory materials. In this paper, a structural failure mode based on the compression bending of Young’s modulus of truss members is proposed. The estimated time for the two towers to collapse or start collapsing is 105 ± 20 min in North Building (WTC1) South Building (WTC2) 5 1 ± 9min, with the actual collapse time of the second floor of the aircraft collision 10 4 min and 5 6 min quite consistent. It appears that the thickness of the refractory cover and its difference of 38.1 mm and 19.1 mm in the second floor, respectively, have a fundamental effect on the collapse of the two towers.