刚性连接钢框架-内填剪力墙结构滞回性能试验研究

EXPERIMENTAL STUDY ON HYSTERETIC BEHAVIOR OF RIGID COMPOSITE STEEL FRAME WITH REINFORCED CONCRETE INFILL WALL

为研究钢框架-钢筋混凝土剪力墙结构(SRCW)的抗震性能,以一榀1:3比例的两层刚性连接钢框架-内填钢筋混凝土墙试件为研究对象,进行水平荷载下的滞回性能试验。根据试验结果分析了剪力墙的裂缝开展过程和破坏模式、结构抗侧刚度的变化、结构的延性等整体性能;钢框架柱的受力及变形、中梁受力及传力、剪力墙变形、剪力钉变形特性等局部性能。结果表明:结构具有较高的强度储备;良好的延性和耗能能力;试件的破坏模式为两柱脚形成塑性铰,一层剪力墙两底角部混凝土的压碎,一层剪力墙正好在暗梁上方形成水平裂缝,显示出明显的弯曲破坏模式。试验研究结果为研究SRCW结构的破坏机理、指导工程设计提供了合理的理论依据。

For investigating the seismic behavior of SRCW structural system, a one-third scale two-stories composite steel frame with FR connection-reinforced concrete infill wall was investigated. The test of the specimen was conducted under lateral cyclic loading to study the hysteresis behavior of SRCW. Based on the test result,the global behavior and local response of the specimen was analyzed,including the cracking and crushing of the RC infill wall, the variation of the stiffeness,the ductility, the strain at critical sections of the steel columns, the strain profiles and internal forces at both ends of the middle beam and its force transfer mechanism,the deformation of the infill wall, the deformation characteristic of the studs. The results showed that the model exhibited good ductility, energy dissipation capacity;the damage mode of specimen induced by the forming of plastic hinges at both of bottom portion of column, crushing and spalling of the concrete at first story corner regions, the forming of lateral cracking just on the submerged beam at first story. It showed obvious flexural failure mode. The study provides the appropriate basis for investigating the failure mechanism and guiding engineering practice of SRCW.