STUDIES ON FORMULATION OF R/C COLUMN UNDER BIAXIAL BENDING

通过对60个试件的偏心受压试验，研究了横向配箍对钢筋混凝土柱的强度和延性的改善作用，结果表明，间距较小、掺量足够大的配筋对钢筋混凝土柱具有显著的延性。结果表明，约束配筋量应大于1.0的取值，即约束配筋率(Voume)与纵向配筋率(面积)之比。本研究的主要目的是寻找双向受弯构件极限强度和延性的最简明的计算公式。从试验和分析结果的比较中可以看出，Ramamurthy提出的双向弯矩计算公式最为适用，但没有计算延性的公式。为此，提出了新的公式，并通过大尺度模型验证了新公式的适用性。

This study experimentally clarifies how the strength and ductility of reinforced concrete columns are improved by transversery confining reinforcements.The results of eccentrically loaded test of 60 specimens indicate that the confining reinforcement with close spacing and enough content gives a remarkable ductility to the column. It is shown that the enough content of confining reinforce- ment is more than the value of 1.0 which is defined , in this study,as the confining ratio of confining reinforcement(voume) ratio to the longitudinal reinforcement(area) ratio.Main object of this study was to find the most spplicable formulas for the ultimate strenght and ductility of the column under biaxial bending.From the results of the comparison betwen expriments and analysis, it was found that the formula proposed by Ramamurthy for biaxial bending moments was tghe most applicable one,but th was no formula for ductility. Therefore,new formulas were proposed and examined the applicablility by large scale models.