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据说美国世贸大厦的设计者们在30多年前就考虑过这种摩天大厦被飞机“误撞”的可能性。于是他们根据当时最大的飞机——波音737作了防范设计,钢筋尺寸、水泥型号以及耐火材料标准都有严格规定。事实也证明设计者当初的“多虑”起了关键作用,双子塔被撞后并未马上土崩瓦解,为楼内人员安全疏散赢得了宝贵时间。很多人认为它是被撞击力摧毁的,但建筑学家推测,它自始至终未发生倾斜,是自上而下垂直坍塌的,因而可能是飞机上大约30吨左右航空煤油爆炸燃烧,产生了上千摄氏度的高温,导致大厦的钢结构被大火烧塌。参与事故调查工作的马里兰大学防火
It is said that designers of the U.S. World Trade Center considered the possibility of such a skyscraper being accidentally hit by a plane more than 30 years ago. So they made a precautionary design based on the largest aircraft at the time, the Boeing 737. The steel bar size, cement type, and refractories standards were all strictly regulated. The facts also prove that the designer’s original “multiple care” played a key role. The twin towers did not immediately fall apart after being knocked down and they gained valuable time for the safety evacuation of the people in the building. Many people believe that it was destroyed by the impact force, but the architects speculated that it had not slanted from beginning to end and that it had collapsed vertically from top to bottom, so it may be about 30 tons of aviation kerosene burning on the plane, resulting in thousands of The high temperature in degrees Celsius caused the steel structure of the building to be destroyed by the fire. University of Maryland fire accident involved in accident investigation