초고강도 철근콘크리트 띠철근 기둥의 압축거동

Abstract

This study investigates the behaviors of high strength concrete tied square columns subjected to concentric axial loads. 10 column specimens were fabricated for experimental test. Five configurations of transverse reinforcement such as A, B, C, E and F-type were considered. Three parameters considered in this study are follows; 1) Volumetric ratios of transverse reinforcement; ps, 2) Spacing of transverse reinforcement; s, 3) Type of transverse reinforcement. Following conclusions are obtained from experimental study. Ultra-high-strength concrete columns under concentric axial loads show extremely brittle behavior unless the columns are confined with transverse reinforcement that can provide sufficiently high lateral confinement pressure. Therefore, the more confinement is required in the column with the higher strength of concrete than column with the lower strength of concrete to achieve same amount of strength enhancement in both columns, respectively.