軸力と2軸曲げを受ける鉄筋コンクリート長柱の弾塑性安定解析

Abstract

The load carrying capacity of a reinforced concrete colomn subjected to axial load andbiaxial bending is investigated analytically. Remarkable influences of reinforcing bar arrange-ment and the value of concrete ultimate strain on the ultimate strength of a column section arerecognized. Three analytical methods are described for slender columns under biaxially eccen-tric loads. The analysis using the finite difference method was difficult to obtain the load-deflection curves post the maximum load. The second method using the Runge-Kutta-Gill methodobtained successfully the curves up to failure and undertook that the third analysis, where thedeflected column shape was approximated by a planar cosine curve and the conditions of equilib-rium were satisfied at the section at mid-height, was also useful in the study of the column behavior.