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(清华大学土木工程系，北京 100084)

［摘要］采用数值手段，研究了防屈曲支撑框架和普通中心支撑框架在性能上的差异。基于弹塑性时程分析，由大量防屈曲支撑框架算例，建立支撑框架结构在大震下的层间位移角最大值随抗侧刚度比k变化的关系曲线，按照大震不倒的要求，获得k值的合理取值范围。分别对不同k值下支撑框架结构的设计进行研究，得到相应k值下允许设计的最弱框架(即框架设计的临界点)，供结构设计参考。

［关键词］防屈曲支撑；防屈曲支撑框架；中心支撑框架；抗侧刚度比；设计方法

Research on design method of buckling restrained braced frames

Zhao Ying, Guo Yanlin (Civil Engineering Department, Tsinghua University, Beijing 100084, China)

Abstract:The behavior differences of buckling restrained braces frames (BRBF) and concentrically braced frames (CBF) have been researched by numerical examples. Based on a large number of elasto-plastic time-history analysis of BRBF examples, the relationship between maximum story drift and lateral stiffness ratio k is established for BRBF subjected to large earthquakes, and according to current Chinese codes for structural design, a reasonable range of lateral stiffness ratio k is recommended. The weakest pure frames are achieved for different k values, which are the reference for preliminary design of BRBF.

Keywords:buckling restrained braces (BRB); buckling restrained braced frames (BRBF); concentrically braced frames (CBF); lateral stiffness ratio; design method

教育部博士点基金资助项目(20060003045)。

作者简介：赵瑛，硕士，Email:ying_zhao02@mails.tsinghua.edu.cn。

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