复合箍筋约束高强混凝土应力应变性能

通过２６个约束混凝土试件（２００ｍｍ×２００ｍｍ×６００ｍｍ）的轴心受压试验，得到了约束混凝土应力应变全曲线。较详细地研究了复合箍筋对高强混凝土（Ｃ６０）强度和变形的影响，并与普通强度约束混凝土（Ｃ３０）进行了比较，主要考虑了箍筋直径、间距、形式和强度等影响因素。统计了高强约束混凝土峰值应力和峰值应变的计算公式。采用的应力应变曲线方程与实测曲线吻合较好。

STRESS-STRAIN BEHAVIOR OF HIGH-STRENGTHCONCRETE CONFINED BY OVERLAPPING HOOPS

, 26 confined concrete columns were tested under uniaxial compression and the complete stress strain curves of concrete were obtained.The effect of overlapping hoops on the strength and ductility of high strength concrete were studied in detail,and were compared with low strength confined concrete.Main factors such as spacing,diameter,yield strength and shape of hoop were considered.The formulas to estimate the strength and deformation of confined concretes were recommended.The theoretical equation of stress strain curve of high strength concrete suggested in the paper are in good agreement with the experimental curves.