杨秀来　徐颖　韩庆华

摘要：研究了不同荷载布置形式、支承方式条件下，单层柱面网壳的抗连续倒塌性能和倒塌破坏模式，采用基于构件承载能力的敏感性评价指标，分析了初始缺陷、压杆失稳等因素对杆件、节点敏感性指标的影响。结果表明，当采用四边支承时，满跨均布荷载起控制作用，跨中节点为敏感构件，与之相邻斜杆为关键构件；当采用纵向两边支承时，半跨均布荷载起控制作用，杆件和节点的敏感性指标在1/3跨处最大，支座处最小。当考虑初始缺陷时，杆件、节点重要性系数分别增大了41%和53%；当考虑压杆失稳时，杆件和节点重要性系数分别增大了45%和62%。通过对关键构件进行加强，可以优化该类结构的抗连续倒塌性能。

关键词：单层柱面网壳；重要性系数；敏感性指标；关键构件；连续倒塌

中图分类号：TU393.3

文献标志码：A文章编号：16744764（2016）01010009

Abstract：

We studied the progressive collapse performance of cylindrical latticed shell and its failure modes indifferent load distribution and boundary conditions. By using the sensitivity assessment index based on the ultimate bearing capacity of components， the influence of imperfection and buckling of compressive rods on the sensitivity index of the rods and nodes. The results show that in the fourside boundary condition， the full uniformdistribution load is mainly controlling. Nodes at the midspan are the sensitive components and the adjacent rods are the key components. In twoside longitudinal boundary condition， the half uniformdistribution load is basically controlling. The largest sensitivity index of the rods and nodes are found at 1/3 span， and the smallest is adjacent to the support. Considering the structural imperfection， the important coefficients of the rods and nodes increase by 41% and 53% respectively； and considering the effect of buckling of compressive rods， increase by 45% and 62% respectively. So we can optimize the progressive collapse performance of cylindrical latticed shell by strengthening the key components.

Keywords：cylindrical latticed shell； important coefficient； sensitivity index； key component； progressive collapse

连续性倒塌是指结构在非常规荷载作用（主要包括炸药爆炸、气体爆炸、车辆撞击和重物冲击以及极端雪荷载等） 下，其局部破坏不断扩展并最终形成和结构初始破坏面积不成比例的破坏，甚至导致结构倒塌的过程。近年来，大跨空间结构连续倒塌事故屡有发生。例如2004年法国戴高乐机场候机厅因顶棚穿孔而导致结构大面积坍塌[1]；2009马来西亚Sultan Mizan Zainal Abidin体育场因支承失效引起其屋顶整体倒塌；2010年美国橄榄球场Hubert H. Humphrey Metrodome由于堆积雪荷载而引起屋顶倒塌[2]；2014年韩国庆州度假村场馆在极端雪荷载作用下发生坍塌事故等。

学者们已经对各类建筑结构的抗连续倒塌性能进行了40多年研究，取得了不少研究成果，并制定了相关的设计规程。……