SRC-RC竖向混合结构转换柱构造措施与受力性能

Mechanical behavior of transfer column with different details in SRC-RC hybrid structure

通过7个转换柱试件和1个钢筋混凝土柱对比试件的低周反复荷载试验,研究了采用不同构造加强措施转换柱的受力性能.结果表明:7个转换柱试件均产生了剪切破坏,破坏发生在转换柱上部的钢筋混凝土部分;转换柱试件表现出较RC柱试件更好的承载能力;具有不同构造特征转换柱的延性性能与变形能力表现出较大的差异,位移延性系数为1.97～5.99,极限侧移角为1/54～1/21,说明不同构造的加强效果差异较大.当转换柱的侧移角达到1/50时,设置构造加强措施5个转换柱试件的强度退化率均高于0.9,说明转换柱具有较强的抵抗反复荷载的能力,承载力具有良好的稳定性.转换柱试件骨架曲线上各特征点对应的割线刚度高于钢筋混凝土柱,介于钢筋混凝土柱与型钢混凝土柱之间.

The low cyclic reversed loading experiment of seven transfer columns of SRC-RC hybrid structure and one reinforced concrete column was carried out to investigate the mechanical behavior of transfer columns with different details.The seven transfer column specimens were all failed with shear pattern at the reinforced concrete part of upper transfer column,which means that bearing capacity of transfer co-lumn is better than that of reinforced concrete column.Displacement ductility and deformation ability of transfer column are quite different,which vary from 1.97 to 5.99 and from 1/54 to 1/21,respectively.When rotated angle of the transfer column reaches 1/50,the degenerated strength ratios of five specimens with different details are all over 0.9,which illuminates that the capacity of cyclic loading resistance is quite good.Secant stiffness of transfer column is higher than that of reinforced concrete column,which is at the interval of reinforced concrete column and steel reinforced concrete column.