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通过10个高强箍筋约束高强混凝土柱在高轴压比下的低周反复水平加载试验,研究该类构件的破坏过程、破坏形态、滞回曲线和延性性能,分析箍筋的应力及其强度发挥水平,并与普通强度箍筋的约束效果进行对比。结果表明,在高轴压比下,该类型柱的滞回曲线仍呈稳定丰满的梭形,具有较好的延性性能、耗能能力和较强的抗倒塌能力,即密配高强箍筋是保证高强混凝土框架柱在高轴压比下具有良好延性性能以及提高其轴压比限值的有效措施;大部分试件破坏时,其高强箍筋已经屈服,箍筋强度可以得到比较充分的发挥,从而达到比较好的约束效果;此外,在同等条件下与普通强度箍筋柱相比,高强箍筋高强混凝土柱其滞回曲线较为丰满、稳定,有较大的塑性耗能能力,延性显著增加,约束效果明显优于普通箍筋。
Through 10 horizontal high-strength concrete stirrups constrained by low-cycle repeated loading under high axial compression ratio, the failure process, failure mode, hysteresis curve and ductility of such members were studied. The stress and strength of stirrup Played horizontally and compared with the restraining effect of stirrups of normal strength. The results show that under high axial compression ratio, the hysteresis curve of this type of column still shows a stable and full fusiform shape with good ductility, energy dissipation capacity and strong anti-collapse ability Which can ensure the ductility of high-strength concrete frame columns under high axial compression ratio and the effective measures to increase the axial compression ratio. When most of the specimens are damaged, the high-strength stirrups have yielded and the strength of the stirrup can be fully exhibited , So as to achieve a better restraint effect. In addition, compared with the normal strength hoop columns, the hysteretic curves of the high-strength stirrup reinforced high-strength concrete columns are relatively full, stable, large plastic energy dissipation capacity, ductility significantly Increase, the restraint effect is obviously superior to ordinary stirrups.