【摘要】 纽约世贸大楼遭受大型客机撞击后引起的结构倒塌事故是从局部楼层的破坏向其他各楼层扩展的连续性倒塌过程,这种最终的完全倒塌或相对于初始局部破坏的大范围倒塌,导致了大量的人员伤亡和巨大的财产损失。国外针对突发事件下结构抵抗连续性倒塌的课题研究历经数十年,形成了明晰的抗倒塌设计思想,提出拉结力设计和备用荷载路径分析等方法,但在诸多方面仍未充分展开,尚难以与传统的结构设计方法相融合。将对结构连续性倒塌控制与设计方法、结构鲁棒性能和冗余特性评价等问题作出评述,并针对大跨结构体系的抗倒塌研究作一探讨,最后结合工程实例,简单讨论倒塌事故的过程和防倒塌设计的注意点。更多还原

【Abstract】 The catastrophic collapse of New York WTC buildings due to airliner attack is a typical example of progressive collapse,occurring from initial failure of local floors to the entire structure.Such a complete collapse,or a large-scale severe collapse,would lead to the worst loss of life and property.Research has gradually been focused on structural performance against progressive collapse due to accidental event,and ideas and design methods for preventing progressive collapse have been put forward,such as the Tie Force and Alternate Load Path methods.However,the research achievement has not yet been in accordance with the traditional methodology for structural design.Referring to the latest literature,this paper reviews the methodologies of structural collapse control design,the evaluation of structural robustness and redundancy,as well as the issue of large span truss structures against progressive collapse.As an example,collapse case is simply analyzed and the key factors for preventing progressive collapse are discussed.更多还原