STUDIES ON FORMULATION OF R/C COLUMN UNDER BIAXIAL BENDING

本文通过60个试件的偏心受压试验，阐明了横向约束钢筋对钢筋混凝土柱的强度和延性的改善作用，结果表明，约束钢筋间距小、含量大，对柱的延性有显著的改善作用。结果表明，在本研究中，围压配筋的足够含量应大于1.0的定义值，作为约束钢筋（体积）与纵向钢筋（面积）之比的约束比本文的主要目的是寻求最适用于双向受弯柱的极限强度和延性的计算公式，通过与试验结果的比较，分析表明，Ramamurthy提出的双向弯矩公式是最适用的，但延性公式却不适用。为此，提出了新的计算公式，并通过大比例尺模型检验了其适用性。

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.