(1 湖南大学土木工程学院钢结构研究所， 长沙  410082； 2 中南林业科技大学土木工程与力学学院， 长沙 410004； 3 湖南科技大学土木工程学院， 湘潭 411201)

［摘要］装配式斜支撑节点钢框架是一种新型结构体系，该框架的桁架梁和斜支撑不同于传统框架。为研究斜支撑对于多层平面钢框架抗连续倒塌性能的影响，采用Pushdown方法和瞬时加载法，分别对无支撑框架和装配式斜支撑节点钢框架在边柱和中柱失效的情况下进行竖向推覆分析和动力非线性分析。分析结果表明：斜支撑改变了框架的传力路径，使桁架梁中部的耗能梁段成为主要受力构件，在达到极限荷载时，桁架梁中部的斜腹杆最先破坏，起到保护梁柱节点的作用；斜支撑可以较大幅度地提高结构的极限承载力和刚度；无论是底层边柱失效还是中柱失效，斜支撑均可以明显减小失效处节点位移，同时起到缓解振荡的作用。

［关键词］斜支撑； 装配式钢框架； 抗连续倒塌

中图分类号：TU391文献标识码：A文章编号：1002-848X(2016)13-0072-04

Influence of inclined braces on the progressive collapse-resistant behavior of prefabricated steel frame structures

Shu Xingping1,  Wang Guangchao1,  Yuan Zhishen2, Lu Beirong3

(1 Steel Structure Institute of Civil Engineering College, Hunan University, Changsha 410082, China; 2 College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China; 3 College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

Abstract:Prefabricated steel frame structure with inclined brace joints is a novel structural system with its truss beam and inclined brace different from the traditional frame. In order to investigate the progressive collapse-resistant performance of prefabricated steel frame structures with inclined braces, Pushdown method and instantaneously applied load method were employed to perform the vertical Pushdown analysis and the dynamic nonlinear analysis on frame structures and precast inclined brace joint steel structures in case of the side column or the middle column loss. The results show that inclined brace changes the force transmission path, and the mid web member of truss beam becomes a major load-bearing element. When it reaches its ultimate load, the main damage is located at the mid web member of the beam, which has played an important role in protecting the connection. The ultimate load capacity and the stiffness will be significantly increased with the presence of the inclined brace. No matter whether the side column or the middle column fails, the inclined brace can significantly reduce the nodal displacements and mitigate the oscillation.

Keywords:inclined brace； prefabricated steel frame； progressive collapse-resistant

*国家自然科学基金项目（51278178）。

作者简介：舒兴平，教授，Email:shuxingping@sina.com。