- 摘 要
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(1 湖南大學土木工程學院鋼結(jié)構研究所， 長沙 410082； 2 中南林業(yè)科技大學土木工程與力學學院， 長沙 410004； 3 湖南科技大學土木工程學院， 湘潭 411201)
［摘要］裝配式斜支撐節(jié)點鋼框架是一種新型結(jié)構體系，該框架的桁架梁和斜支撐不同于傳統(tǒng)框架。為研究斜支撐對于多層平面鋼框架抗連續(xù)倒塌性能的影響，采用Pushdown方法和瞬時加載法，分別對無支撐框架和裝配式斜支撐節(jié)點鋼框架在邊柱和中柱失效的情況下進行豎向推覆分析和動力非線性分析。分析結(jié)果表明：斜支撐改變了框架的傳力路徑，使桁架梁中部的耗能梁段成為主要受力構件，在達到極限荷載時，桁架梁中部的斜腹桿最先破壞，起到保護梁柱節(jié)點的作用；斜支撐可以較大幅度地提高結(jié)構的極限承載力和剛度；無論是底層邊柱失效還是中柱失效，斜支撐均可以明顯減小失效處節(jié)點位移，同時起到緩解振蕩的作用。
［關鍵詞］斜支撐； 裝配式鋼框架； 抗連續(xù)倒塌
中圖分類號：TU391文獻標識碼：A文章編號：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
*國家自然科學基金項目（51278178）。
作者簡介：舒興平，教授，Email:shuxingping@sina.com。
