半刚接钢框架(柱弱轴)-内填剪力墙结构滞回性能试验研究

Hysteretic behavior of simi-rigid composite steel frame with reinforced concrete infill wall in column weak axis

目前我国规范关于钢框架-内填RC剪力墙组合结构体系(SRCW)的有关内容基本空白,通过了解国际上在SRCW结构体系研究领域的发展状况,以尚未研究的半刚连接钢框架(柱弱轴)-RC剪力墙结构为研究对象,通过1∶3比例将原结构缩放为一两层单跨试件结构,进行了水平循环荷载下的滞回性能试验。根据试验结果分析了结构的抗侧刚度变化、裂缝开展过程与破坏模式、结构的耗能和抗震延性和安全性等整体性能;钢框架柱的变形、中梁受力与传力机理、PR连接性能、RC剪力墙和剪力钉的变形反映的结构变形模式局部性能。结果表明:试验结构具有较好的延性、耗能性能和安全储备;试件结构的破坏模式为RC墙角部混凝土压溃,钢框架柱脚和梁柱半刚性连接部位形成塑性铰,研究为SRCW规范的制订和工程应用提供了合理的理论依据。

According to the development in research field of SRCW structural system and the demand of relevant structural specification to be amended, the composite steel frame with PR connection-reinforced concrete infill wall in column weak axis was investigated. The two-storey, one bay specimen was derived by approximately one-third scale, which represented the bottom two stories of a six-story prototype building. 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 strength and stiffness; the cracking and crushing of the RC infill wall, the ductility and energy dissipation capacity, 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 behavior of the PR connection, and the deformation mode were identified. The results showed that the model exhibited good ductility, energy-dissipation capacity; the damage mode of specimen occurred primary induced by crushing and spalling of the concrete at corner regions with forming of plastic hinges at the bottom portion of column and PR connection. The study provides the experimental basis for amending the specification and engineering practice of SRCW.