抄録
Ordinary types of column bases, which are usually encountered in small steel buildings, consist of anchor bolts embeded in a concrete footing and a base plate not covered by reinforced concrete. This paper deals with theoretical estimation of the ultimate strength for these types of column bases. In this paper the tensile strength of anchor bolts and the flexural strength of a base plate are chosen for the parameters governing the column base strength. The column base subjected to a bending moment and an axial force is substituted by a simple mechanical model. Then a rational solution for the interaction surface of flexural and axial resistances in the column base is presented through the upper and lower bound theorems in the limit analysis. The solution is compared with the maximum strength observed in past experimental results, and proved to provide satisfactory predictions. 1) Research Associate, Institute of Industrial Science, University of Tokyo 2) Professor, Institute of Industrial Science, University of Tokyo
