型钢混凝土（SRC）柱脚是SRC结构高层建筑底层柱与基础连接的关键部位，承担着有效传递内力、保证结构整体性的重要作用。目前我国组合结构设计规范关于SRC柱脚的设计方法，主要是借鉴日本SRC设计计算规范（1987）方法得到的，没有考虑到我国SRC结构适用高度更高、构件尺度更大、柱脚所承受的内力更大、且内力之间的相对大小也显著不同的突出特点，迫切需要通过系统研究，有针对性地解决我国SRC柱脚设计所面临的诸多技术难题。本课题拟通过结构试验和理论研究的方法，深入系统研究地震作用下不同形式的SRC柱脚(埋入式、半埋入式、非埋入式)的抗震性能。通过在轴压力、轴拉力以及变化轴力下SRC柱脚不同破坏模式的系列抗震性能试验，研究SRC柱脚典型破坏机制、塑性变形能力以及滞回耗能能力特征；运用塑性力学极限分析方法，建立保证柱脚延性抗震设计的极限强度理论计算模型及抗震设计方法。

The Column base of steel reinforced concrete(SRC) columns in modern tall buildings is the key component to transfer internal forces from the upper stories to the foundation. The design provisions concerning the column base in China Design Codes of SRC structures are mainly formulated on AIJ Standard for Structural Calculation of Steel Reinforced Concrete Structures（1994）, while the height of modern tall buildings at present in China is much larger than that of Japan and the magnitude of internal forces in the column base is much larger as well. Therefore, there is an urgent need to study on such column bases both in experimental research and in theoretical modeling method to keep up with their rapid applications in tall buildings. In this research program, a series of reversed cyclic loading experiments on seismic behavior of SRC column bases, that is, the embedded, the shallow embedded, and the unembedded column bases, are proposed to be carried out to investigate ultimate capacities of such column bases of different failure modes.At the same time, axial tension, compression and variable axial tension/compression forces are imposed on the SRC columns bases to simulate effect of overturning moment. Such parameters as axial force, size of anchor plate, number of anchor bolts and their development lengths,the reinforced concrete surrounding the anchor plate,and the longitudinal reinforcement ratio are taken into account to evaluate their effects on failure mechanism, plastic deformation capacity and hysteretic energy dissipation capacity. Theoretical ultimate strength models based on limit analysis in concrete plasticity are proposed and design equations are expected with much more accuracy and rational physical background, together with more effective detailing provisions.