(1 郑州工程技术学院土木工程学院， 郑州 450044；2 上海建工二建集团有限公司， 上海 200080)

［摘要］为了研究核心筒悬挂钢结构在施工过程中的抗连续倒塌性能，采用备用荷载路径法，运用MIDAS Gen软件对浦东新区黄浦江沿岸E8单元E17.4商业办公楼项目进行了连续倒塌分析研究，从结构模型中移除选定的关键受力构件，模拟结构施工过程中构件因偶然荷载的瞬间失效，通过计算结构在构件拆除后剩余结构的内力和变形，研究悬挂钢结构的倒塌机制并对其进行连续倒塌风险评估。结果表明：核心筒悬挂钢结构具有一定的抗连续倒塌能力，当失效1根关键构件时结构仍处于安全状态；当同时失效2根关键构件时结构接近倒塌风险，建议采取额外的设计加强措施。 

［关键词］核心筒悬挂钢结构；备用荷载路径法；连续性倒塌；倒塌机制；传力路径；非线性静力分析 

中图分类号：TU398-2 文献标识码：A文章编号：1002-848X(2021)18-0069-05

Progressive collapse research of corewall suspended steel structure based on alternate load path method 

GUO  Yankun1,  XIA  Yibing2,  MA  Yueqiang2 

(1 College of Civil Engineering, Zhengzhou University of Technology, Zhengzhou 450044， China；2 Shanghai Construction No.2(Group)Co., Ltd., Shanghai 200080， China) 

Abstract: In order to study the progressive collapse resistance performance of corewall suspended structure during construction, the backup load path method was used to analyze the progressive collapse of E17.4 commercial office building project of E8 unit along the Huangpu River in Pudong New Area by using MIDAS Gen software. The selected sensitive stress components were removed from the structural model to simulate the instantaneous failure of components due to accidental load during construction. By calculating the internal force and deformation of the remaining structure after the removal of the members, the collapse mechanism of the suspended steel structure was studied and the risk of progressive collapse was assessed. The results show that the corewall suspended steel structure has a certain resistance to progressive collapse, and the structure is still in a safe state when one key member fails. When two critical components fail at the same time, the structure approaches collapse risk and additional design strengthening measures were recommended. 

Keywords:corewall suspended steel structure； alternate load path method； progressive collapse； collapse mechanism； force transmission path； pushover analysis

作者简介：郭艳坤，硕士，讲师，Email:guoyankun2002@163.com。