隅撑支撑框架结构的性能及其设计方法

隅撑支撑框架（knee-bracedframe，KBF）是在梁柱连接的附近设一延性耗能的隅撑，主支撑连接在此隅撑上而构成的抗震结构体系。与偏心支撑框架（EBF）抗震结构体系对比，KBF具有中震时框架结构不损坏，维修方便的优点。本文对KBF的研究现状进行了综述。推导了隅撑框架结构的横向刚度，提出了构造KBF结构骨架曲线的方法；采用有限元分析考察了不同的隅撑形式、不同高宽比下KBF结构的弹塑性性能；分析了隅撑塑性转角增量与层间位移增量的关系，总结了设计方法和设计步骤。

Behavior and Design Approach of Knee-Braced Frames

In knee-braced frames(KBF), there is a small but ductile knee brace near beam-to-column joint to avoid the main brace connected directly to the joint. Comparing with the well known eccentrically braced frame(EBF), KBF has the merits of protecting the main frame from damage during a medium earthquake and easier repair after a big earthquake. This paper presents a review on the investigation into KBF. Lateral stiffness of the KBF is derived, and a procedure for constructing the skeletal curve of the KBF is proposed. Elastic-plastic pushover analysis is also carried out to compare the behaviour of knee braced frames having different geometries with that of the EBF. A relation between the plastic deformation within the knee brace and the lateral drift is derived. Finally a procedure for design of KBK is summarized.