联肢钢-混凝土组合剪力墙端板螺栓式钢连梁抗震性能研究

Seismic performance of bolted endplate steel coupling beams for coupled composite shear wall

我国高层建筑已经进入广泛应用钢-混凝土组合剪力墙的阶段。由钢-混凝土组合墙肢耦合而成的联肢组合墙中,由于钢构件预埋于墙肢边缘区域,给传统连梁的应用带来了困难。为了开发出适用于联肢钢-混组合剪力墙的连梁形式,将钢结构中常用的端板螺栓连接构造引入,利用其构造简单、易于施工且抗震性能良好的优点,连接钢连梁与组合剪力墙。以连梁长细比为主要参数,设计并制作5个采用端板螺栓连接的双肢组合剪力墙试件和1个传统直插式的小比例双肢钢筋混凝土剪力墙试件,进行低周往复拟静力加载试验,以考察端板螺栓连接钢连梁的受力特征、滞回性能、刚度与强度退化特征以及破坏模式。利用有限元分析方法对试验过程进行数值模拟并与试验结果对比。结果表明,端板螺栓连接钢连梁能够达到较高的延性水平和较大的耗能能力,刚度、强度退化不明显。试验加载过程的剪力-侧向位移骨架曲线与有限元分析结果吻合较好。

The bolted endplate connection is one of the widely used connection types in steel structures with the advantages of simple detail,construction convenience and good seismic performance. In this study,the bolted endplate connection is introduced into the coupled steel-concrete composite shear walls to connect steel coupling beams and wall piers. Five coupled composite shear walls with bolted endplate steel coupling beam and wall connection and one conventional hybrid coupled shear wall with directly embedded steel coupling beam,mainly considering the influence of clear span,were designed,fabricated and tested under low-cycle reversed loading to investigate the load transfer characteristics,hysteretic behavior,degradations of strength and stiffness and failure patterns of the specimens. Finite element analysis was conducted to numerically simulate the shear force-lateral displacement backbone curves of all specimens. The results indicate that the bolted endplate connected coupling beam can ensure the coupled composite shear walls to exhibit excellent ductility and energy dissipation capacity. The load transfer at the joint region is smooth and rational. The degradation of strength and stiffness is insignificant. The finite element analysis results agree well with the experimental results.