在钢结构连接节点设计中，柱脚是一个关键部位。柱脚的作用是将钢柱的下端固定于钢筋混凝土基础或基础梁，并将柱身所受的内力传递给基础。柱脚的受力性能对结构整体性有着直接的影响。本项目拟采用试验和有限元模拟分析相结合，开展钢柱脚抗震性能及设计方法研究。通过对钢柱脚试件的加载试验和有限元模拟，揭示在不同轴压与模拟地震往复水平加载下组合钢柱脚的受力机理、破坏模式、承载能力和变形特性。通过参数分析，研究轴压比、锚栓布置以及底板厚度等对钢柱脚抗震性能的影响规律。通过归纳分析试验和有限元模拟结果，提出钢柱脚的承载力、刚度的设计计算方法和公式，以及可用于整体结构分析的简化计算模型。通过典型钢框架结构的地震响应全过程数值模拟分析，研究钢柱脚的延性和变形的需求，提出确保钢柱脚抗震性能的构造要求与构造措施建议。本项目研究成果可以进一步完善钢结构抗震设计理论，并为提高钢结构建筑的地震安全提供技术保障。

Column base connections are the most important type of structural connections, transferring forces from the entire structure into the foundation. The behavior of column base connections directly affects the whole structural system. This research will investigate the seismic behavior of column base connections based on both experiments and numerical analysis. Primary parameters of this research are the axial force ratio, anchor rod properties and layout, and base plate thickness. The effect of the parameters on the seismic behavior of column base connections, such as initial stiffness, yield strength, maximum strength, and energy dissipation, will be discussed. Based on the discussion, the resisting mechanism of column base connections will be summarized, and the evaluation of stiffness and strength will be proposed. Furthermore, a hysteresis model of column base connections will be proposed. Using the proposed hysteresis model, a series of frame seismic response analyses will be conducted to investigate the ductility demand of column base connections. Eventually, a seismic design method and suggestions of column base connections will be proposed. This research will contribute to the current seismic design of steel structures. Using the results of this research, designers and engineers will be able to improve the safety and economy of their designs.