盲眼螺栓连接方钢管混凝土柱与H型梁角钢节点抗震性能研究

钢管混凝土结构能充分利用钢材和混凝土材料的组合效应，促使其在实际工程中得以广泛应用。由于钢管特殊的截面形式，传统螺栓不能直接用于钢管混凝土框架节点的连接。本项目提出采用新型盲眼螺栓连接方钢管混凝土柱与H型梁，此类组合节点具有单边拧紧、施工快捷和受力性能良好等优点，且工程应用前景广阔。然而，国内外对盲眼螺栓连接钢管混凝土框架的角钢节点研究有限，还缺少必要的试验数据、计算模型和设计方法。本项目拟通过一系列试验与理论分析，研究盲眼螺栓的疲劳破坏机理，进一步探讨方钢管混凝土柱与H型梁角钢节点在循环荷载作用下的破坏形式、刚度退化规律以及延性和耗能等抗震性能。基于已有空心钢管柱梁节点研究成果，建立钢管混凝土框架节点的有限元模型和组件法模型，推导节点抗弯刚度和承载力的计算公式，最终用于指导钢管混凝土框架节点的设计和工程应用。

The combination of the merits of the steel and concrete materials makes concrete-filled steel tube (CFST) an ideal choice as column members in the buildings and bridges. However, the difficulties associated with the lack of access for the installation of conventional bolts have often hamper the research and design of bolted connections to tubes. A special bolt system named blind bolt has provided the development of a new bolted connection alternative. This project is designed to employ blind bolt in bolted angle connections to concrete-filled square steel tubular columns. Nevertheless, there is a lack of experimental and numerical studies on the seismic performance of blind bolts as well as blind-bolted angle details to concrete-filled steel tubular columns. Therefore, this project is to focuse on examining the fatigue property of blind bolts, and the seismic behaviour of blind bolted open beam-to-concrete-filled square steel tubular column angle connections, with emphasis on bolt fatigue damage, connection stiffness, ductility, energy-dissipation and failure mechanisms through a series of experimental studies. The analytical models including the three-dimensional numerical model and the component-based spring model for this type of connections is also proposed to construct based on the previous research of the applicant for further assessment of the connection response and the development of design-oriented procedures.