Abstract
Column bases are most important parts in strength and deformation capacity in the estimate of seismic resistance of steel framed structures. A lot of research works has been made, however, the relationship between the structural behavior and the behavior of column bases has not been made clear yet. In this paper, the analytical model of fish-bone of frame is applied and the experimental results of column bases is introduced. Five-storied weak-beam type frames are taken. The bottom of columns is equipped with actual column bases. Damage distribution and deformation of the column bases are analyzed in terms of the intensity of seismic input. As a references, two type of idealized fundamental frames are introduced. Based on the result of analysis, the design method of column bases for low-rise steel frames is summarized.
