防屈曲支撑钢筋混凝土框架滑移连接节点抗震性能分析

Seismic performance of sliding gusset connections in buckling-restrained braced reinforced concrete frame

防屈曲支撑是一种高性能的耗能装置,目前已广泛应用于工程结构当中。但由于支撑框架节点的开合效应,节点板可能在大震下提早破坏,从而限制防屈曲支撑抗震性能的发挥。为此,本文首先总结了防屈曲支撑框架节点的现行设计方法,分析了节点失效模式和应对方法。在此基础上提出了一种滑移连接节点板形式,以减小节点的开合效应。通过建立混凝土框架有限元模型,对比分析节点连接形式对框架抗震性能的影响。

Buckling-restrained braces are high performance energy dissipation devices,which have been used in engineering structures widely.However,due to the frame action effects under severe earthquakes,the seismic performance of buckling-restrained braced frames is limited by the premature fracture of corner gusset connections.Firstly,several commonly used design methods for corner gussets connections were reviewed,and the failure modes and improved methods for corner gussets connections were studied.A novel sliding gusset connection was proposed to mitigate the frame action effects.Three finite element models of two buckling-restrained braced reinforced concrete frames with the new and traditional gusset connections and a common reinforced concrete frame,were constructed to investigate the effect of different configurations on the structural behavior of the gusset plates and frames.