横拘束鉄筋を有する鉄筋コンクリート正方形断面柱の終局耐力と靱性に関する実験的研究
1989 年 1989 巻 408 号 p. 21-30
詳細
1989 年 1989 巻 408 号 p. 21-30
An experimental study on the ultimate strength and ductility of reinforced square columns with confining reinforcement is described. Sixty specimens, each 200mm square by 800mm high, containing either 8 or 12 longitudinal steel bars and different arrangement of square or octagonal steel hoops, were subjected to concentric or eccentric loads to failure under uniaxial or biaxial bending. Other variables were the spacing of hoops and the eccentricities of loads. Based on the test results and analyses, new formulas are proporsed for the ultimate strength and ductility of the columns with confinement subjected to uniaxial or biaxial bending. A new parameter which was defined, in this study, as the confining ratio of confining reinforcement ratio to the longitudinal reinforcement ratio was used in the formulas. As it is difficult to predict analytically ductilities of columns under biaxial bending, a simple design method is proposed.
