世贸大厦“坐塌”分析与高层建筑的分区隔震

ANALYSIS OF THE WORLD TRADE CENTRE CAVE-IN COLLAPSE AND SEISMIC ISOLATION OF THE HIGH-RISE BUILDING IN SUBAREA

飞机撞击和爆炸产生的应力波在楼体中的传播和叠加,产生了巨大的反复破坏应力,使得世贸大厦承重结构发生塑性破坏,从而使之发生"坐塌"而非倾斜倒塌。世贸大厦冲击部位上部结构倒塌虽然不可避免,但可通过采取一定的减震措施来避免下部结构的倒塌。鉴于此,提出了超高层建筑结构振动分区控制的思想,并为今后超高层建筑的抗震提供一个设想。

The bearing structure of the World Trade Centre, where plastic breakage happened in the end, was broken by the repeated stress arised from the wave spreading and superposing which caused by aeroplane crash and explosion, all of which made the WTC not overturning but cave-in collapse. Although it was inevitale that the upper structure of impacted area collapsed, yet the collapse of the nether part can could be avoided by some countermeasures, called energy assumption. So it is put forward an idea that can control the vibration of a high-rise building in subarea. This idea is so realistic that it can provide the aseismic design for the building with such a good conception.