HRB400级钢筋混凝土短柱抗震试验研究

Seismic behavior of HRB400 reinforcement concrete short columns

通过对HRB400级钢筋混凝土短柱在水平反复荷载作用下的抗震试验研究,分析了HRB400级钢筋和C60,C70,C80高强混凝土匹配下的配箍率为0.269%、剪跨比为1.9的混凝土短柱破坏形态、滞回特性,并将试验得到的承载力与采用现行规范公式计算结果进行了比较。研究结果表明:试验柱承载力随混凝土强度的增大而增大;试验柱在水平反复荷载作用下发生的都是脆性的剪切破坏,延性极差;采用现行规范计算HRB400级钢筋混凝土短柱的受剪承载力过于保守。

Based on sewasmic experimental study of HRB400 reinforcement concrete short columns under cyclic lateral loading, the failure shapes and hysteretic characterwastics were analyzed in this paper. The required stirrup area per unit area of column with the strength classes of high-strength concrete of C60, C70 and C80 was 0. 269% , and ratio of shear span to depth was 1.9. The bearing capacity obtained by the test was compared with the result computed by formula from current code for design of concrete structures. It shows that the bearing capacity of the experimental column increases as the concrete is strengthened. The failure characterwastic of experimental columns is brittle shear failure, and its ductility is very bad. The shear capacity of the short column given by current code for design of concrete structures is very conservative.