Abstract
In this study, as to lay emphasis on the distribution of stress at respective portion of Steel and RC in column bases we make clear the mechanism of stress transfer developed through the connection and investigate the right or wrong of applicative equations of the deformation behavior and resisting strength concerning its connections. And further, we intend to obtain the practical design recommendations. This paper reports on the results obtained experimentally on the characteristics of stress transfer, resisting strength and deformation characteristics of column bases subjected to repeated lateral loading. The main results derived from the analysis on these experiments are as following : (1) In the modes of failure, it was recognized to reach the maximum strength on account of shearing crack occurred from the top in tension side to the starting point of haunch (case of l_h/_sH=5.75) or connecting parts (case of l_h/_sH=2.75) in compression side at the concrete consolidated round the base. (2) On the relation between load and deflection, the higher height of the RC consolidated round the base is, the larger capability of deformation is after yield of the connections. (3) The respective values calculated for ultimate flexural strength and ultimate shear strength in connections of column bases consolidated with RC is underestimated in comparison with the experimental values, but the estimate of ultimate strength in practical design may be predicted by the minimum value of the strength equations (8) and (10) proposed in this paper.
