基于附加弹性刚度的多层剪切型框架-BRB体系设计方法  

Design method for multi-story shear frame-BRB system based on additional elastic stiffness

作　　者：孟凡涛[1,2] 阮兴群 赵建锋 柳晓博[2] Meng Fantao;Ruan Xingqun;Zhao Jianfeng;Liu Xiaobo(Qingdao University of Technology,Qingdao 266033,China;Shandong Huake Planning and Architectural Design Co.Ltd,Liaocheng 252000,China)

机构地区：[1]青岛理工大学,山东青岛266033 [2]山东华科规划建筑设计有限公司,山东聊城252000

出　　处：《建筑科学》2021年第3期98-104,共7页Building Science

基　　金：山东省住房和城乡建设厅研究开发项目(2019-K4-2,2020-K3-9)。

摘　　要：为了便于更快捷和准确地设计以剪切变形为主的多层框架-屈曲约束支撑(BRB)体系,使得工程技术人员能够更加清晰地掌握屈曲约束支撑(BRB)所提供给框架结构的附加抗侧移刚度,本文根据《建筑抗震设计规范》(GB 50011—2010)的反应谱,在不计BRB质量的情况下,利用未设置BRB的单自由度体系和设置BRB的单自由度体系,两者层间位移角的关系,根据两者的周期所处的反应谱的时段不同,建立了BRB所提供给框架结构的附加抗侧移刚度的计算公式。随后,根据相关的条件,推导了如何将多自由度体系等效为单自由度体系,根据该等效原理,可以便捷地利用等效单自由度体系附加给框架结构的抗侧移刚度,得到多自由度体系中每层的BRB提供给该层框架的抗侧移刚度,从而可确定该层BRB的设置数量和相应的承载力,并给出了相关的实用设计流程图。最后,结合工程案例验证了本文方法的实用性。In order to design the frame-Buckling-Restrained Braces(BRB)system based on shear deformation quickly and accurately,engineers can grasp the additional lateral stiffness of the frame structure provided by the Buckling-Restrained Braces(BRB)more clearly.According to the seismic spectrum of building seismic code(GB50011—2010),the single-degree-of-freedom system without BRB and the single-degree-of-freedom system with BRB are used to analyze the displacement angle between the two systems in elastic stage.The relationship is calculated according to the period of the response spectrum of the two periods,and the calculation formula of the additional anti-lateral stiffness value provided by BRB to the frame structure is established.According to the relevant assumptions,it can derive the multi-degree-of-freedom system into a single-degree-of-freedom system.The equivalent single-degree-of-freedom system can be used to add the anti-lateral stiffness value of the frame structure on the basis of the equivalent principle.The BRB of each layer in the multi-degree-of-freedom system provides the lateral stiffness resistance value of the layer frame,so that the number of BRB and the corresponding bearing capacity of the BRB can be determined,and a related practical flow chart is given.Finally,the correctness and effectiveness of the proposed method are verified according to the specific engineering case.

关 键 词：屈曲约束支撑 框架结构 抗侧移刚度 反应谱 单自由度体系 多自由度体系 

分 类 号：TU352.11[建筑科学—结构工程]