框架-预应力摇摆墙结构抗震性能试验研究

EXPERIMENTAL STUDY ON THE SEISMIC PERFORMANCE OF FRAME-PRESTRESSED ROCKING WALL STRUCTURES

该文提出了一种框架-预应力摇摆墙新型结构形式,其中摇摆墙脚部混凝土采用橡胶块替代,并通过墙内预埋的无粘结预应力筋与基础进行贯穿连接,摇摆墙与主体框架则采用耗能连接件相连。通过一榀框架试件和一榀框架-预应力摇摆墙试件的拟静力试验,研究了试件的破坏形态、承载能力、刚度退化和耗能能力等抗震性能。结果表明:框架-预应力摇摆墙结构的破坏有效地集中在耗能连接件上,梁端、柱端以及梁柱节点区的破坏相对较轻;极限承载能力提升显著,相较对比框架提高了112.4%;耗能能力较对比框架大幅提升,且各层层间变形趋于均匀;耗能连接件发挥出了良好的延性变形能力,且施工方便、造价低,实现了可更换构件与摇摆结构的有机结合。

A new frame-prestressed rocking wall structure was presented in this paper, in which the foot area of the rocking wall was replaced by two rubber blocks. The wall was connected with the foundation by the embedded unbonded tendons and was connected to the columns of the frame with six I-shaped steel connectors. The seismic behavior of specimens including the failure mode, strength, stiffness degradation and energy dissipation capacity was studied through quasi-static tests of a frame specimen and a frame-prestressed rocking wall specimen. The results show that the deformation of the frame-prestressed rocking wall was effectively concentrated in the energy consumption connectors, while the damage to the ends of the beams and columns and the core area of beam-column joints was relatively light. The ultimate strength was greatly increased by 112.4% compared to the control frame. The hysteretic energy dissipation capacity was increased significantly, and the deformation of each story tended to be uniform to avoid story yielding mechanism. The I-type energy dissipation connectors had shown good ductility and deformability, which were replaceable and cheap. The combination of the replaceable components and the rocking wall structure was realized.