高强钢筋混凝土框架柱双向受剪性能试验研究

Experimental research on bilateral shear strength of reinforcement concrete frame columns

为研究配置高强钢筋的混凝土框架柱的双向受剪性能,进行了两组12根矩形截面框架柱的试验研究,其中第一组采用单调加载,第二组采用低周往复加载,分析斜向水平荷载下两个主轴方向的配箍量不相等的框架柱破坏特征、承载力、位移、滞回曲线、耗能能力及强度退化等抗震性能。试验结果表明:往复加载时的最大荷载与极限位移均低于单调加载时的最大荷载与极限位移;在加载初期框架柱耗能能力较差,强度退化不明显;随着加载位移逐渐增大,耗能能力也有所提高,强度退化程度明显增加。

In order to study the bilateral shear behavior of high strength reinforcement concrete frame columns, two groups of 12 specimens were tested. The two groups are subjected to low cyclic loading and monotonic load, respectively. The damage characteristic, bearing capacity, displacement, hys- teretic curve, energy dissipation and strength degradation of the specimens with different stirrups in both principal directions are compared. It is shown that the maximum load and limit displacement under low cyclic loading is lower than that under the monotonic load. At the beginning of loading, the energy dissipation is weak and the strength degeneration is not obvious. With the increase of dis- placement, the energy dissipation improves and the strength degeneration increases.