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针对地震灾害中桥墩柱的破坏形态,考虑轴压比变化、预应力大小、纤维布层数和加载顺序等因素的影响,对9根采用与未采用预应力碳纤维条带加固的钢筋混凝土圆形墩柱进行了低周反复荷载试验研究。通过各试件主要破坏形态和滞回曲线的对比,分析了各因素对承载力、延性性能、滞回特性、耗能能力等重要抗震性能指标的影响。结果表明:采用预应力碳纤维条带加固后,柱的承载力、延性性能、耗能能力均有较大幅度提升;预应力碳纤维条带提供的主动横向约束力能有效抑制斜向剪切裂缝的开展,将圆墩柱的破坏形态由剪切破坏转变为延性较好的弯曲破坏;先施加轴力后进行预应力碳纤维条带加固所得的加固承载力低于后施加轴力的试件。
Considering the failure modes of the bridge pier in the earthquake disaster, considering the influence of the axial compression ratio, the prestressing force, the number of fiber layers and the loading order, nine reinforced concrete circular columns reinforced with prestressed carbon fiber strips Pier column under low cycle repeated load test study. Through the comparison of the main failure modes and hysteresis curves, the influences of various factors on the important seismic performance indexes such as bearing capacity, ductility, hysteresis characteristics and energy dissipation capacity were analyzed. The results show that the bearing capacity, ductility and energy dissipation capacity of the columns are greatly enhanced by prestressed carbon fiber strips. The active lateral restraint provided by the prestressed carbon fiber strips can effectively restrain the oblique shear cracks , The damage form of the circular column was changed from shear failure to bending failure with good ductility. The bearing capacity of the reinforcement strengthened by prestressed carbon fiber strips after the axial force was applied first was lower than that after the application of axial force.