循环荷载作用下型钢高强高性能混凝土框架柱受力性能试验研究

Experimental research on mechanical behavior of SRHSHPC frame columns under cyclic loading

为了研究型钢高强高性能混凝土框架柱的抗震性能,进行了9个不同轴压比、体积配箍率、含钢率、加载制度下的型钢高强高性能混凝土框架柱试件低周反复加载试验。获得了型钢高强高性能混凝土框架柱的破坏形态,分析了不同设计参数及加载制度对该框架柱的荷载-位移滞回曲线、骨架曲线、刚度和强度退化、变形能力、滞回耗能等力学性能的影响。试验结果表明:框架柱荷载-位移滞回曲线饱满,下降段较为缓慢,总体上表现出良好的抗震性能;随着循环次数和位移幅值的增加,试件的刚度、强度不断退化,耗能能力以及极限变形能力不断降低;与变幅循环加载相比,常幅循环加载下试件的破坏过程较为缓慢,滞回耗能总量相对较大。

The seismic behavior of steel reinforced high strength high performance concrete（SRHSHPC） frame columns was investigated through low cycle reversed loading experiment of 9 frame column specimens with various axial compression ratios,stirrup ratios,steel ratios and loading histories.The failure pattern of frame columns was obtained.The influence of design parameters and loading histories on load-displacement relationship,skeleton curve,strength and stiffness degradation,deformability and energy dissipating capacity were analyzed.The results show that the hysteretic curves of frame columns are plump,and the descending branch is relatively slow,indicating excellent seismic behavior.With the increase of cycle number and displacement amplitude,the strength and stiffness degradation and decrease of energy dissipating capacity and ultimate deformability decrease.Compared with varied displacement amplitude cycle loading,the process of damage evolution of specimens is slower under constant displacement amplitude cycle loading,and the total energy dissipation of specimens is comparably larger.