高強度鉄筋コンクリート柱の横補強筋効果に関する解析的研究

Abstract

In this study, the effect of confinement of core concrete by lateral steel bar on the ductility of high strength reinforced concrete (RC) column was examined analytically by a 3-dimensinal finite element method. In the analysis, the endochronic theroy was applied to the expression of multiaxial stress-strain relation of concrete. Following results were obtained in this study : 1) The multiaxial stress-strain relations predicted with the endochronic theory proposed by Z. P. Bazant et al. are applicable to the predictions of response of high strength RC column subjected to the uniaxial compressive loading. 2) The ductility improvement of RC column by lateral steel bar is affected by the yield point and the method of arrengement of lateral steel bar. Accordingly, the relationship between the stress distribution in RC section and the various conditions of lateral steel bar shoud be clarified, in order to improve the ductility of RC column effectively. 3) The plastic deformation behavior of RC column is affected by the concrete strength, even if the conditions of yield point and method of arrengement of lateral steel bar is equal. The response of RC column with the higher strengh concrete is more brittle.