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完成了3个小跨高比超高韧性水泥基复合材料连梁和1个普通钢筋混凝土连梁的低周反复加载试验,研究了连梁的破坏形态、滞回性能、耗能能力、刚度退化等性能,分析了连梁跨高比变化对其抗震性能的影响。研究结果表明,与普通钢筋混凝土连梁相比,小跨高比连梁的破坏形态有从脆性向塑性转变的趋势;超高韧性水泥基复合材料连梁的滞回曲线呈反S形,刚度退化较为明显,但较普通钢筋混凝土连梁的滞回曲线更为饱满,刚度退化趋势变缓;超高韧性水泥基复合材料连梁能改善连梁抗震工作性能,满足工程设计要求。
The low-cycle repeated loading tests of three beams with small cross-ratio ultra-high toughness cementitious composite beams and one ordinary reinforced concrete beam were carried out. The failure modes, hysteretic behavior, energy dissipation capacity, And other properties, analysis of the beam-span ratio changes its seismic performance. The results show that compared with common reinforced concrete beams, the failure modes of the beams with small span ratio tend to change from brittleness to plasticity. The hysteretic curves of the ultra-high toughness cementitious composite beams show inverse S-shape and stiffness But the degeneration curve is more full than that of ordinary reinforced concrete, and the stiffness degeneration trend becomes slower. The ultra-high toughness cement-based composite beam can improve the seismic performance of coupled beams and meet the engineering design requirements.