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为了研究地震作用下型钢高强高性能混凝土框架梁的损伤演化过程,对5榀不同含钢率、配箍率下型钢高强高性能混凝土框架梁试件进行了低周反复加载试验。分析了框架梁的破坏形态以及裂缝开展模式,得到了低周反复荷载作用下框架梁的荷载-位移滞回曲线和骨架曲线,研究了不同含钢率、配箍率下框架梁的刚度退化、强度衰减、延性性能、耗能能力等方面的规律与特点。结果表明:在低周反复荷载作用下,经过合理设计的型钢高强高性能混凝土框架梁一般发生弯曲型破坏,且具有良好的延性和抗震耗能能力;随着水平位移幅值和循环次数的增加,框架梁的损伤逐渐累积,使其强度和刚度不断退化,耗能能力降低,但随着含钢率和配箍率的增大,强度和刚度退化幅度减小,累积耗能能力增强。研究结果为进一步建立能够描述型钢高强高性能混凝土框架梁损伤程度的地震损伤模型,揭示损伤对框架梁力学性能的影响提供试验支持。
In order to study the damage evolution process of high strength and high performance concrete beam under seismic action, the low-cycle cyclic loading test was carried out on specimens of 5% high-strength and high-performance concrete beams with different steel content and stirrup ratio. The failure mode and crack initiation mode of the frame beam were analyzed. The load-displacement hysteresis curve and the skeleton curve of the frame beam were obtained under low cycle and repeated load. The stiffness degradation of the frame beam with different steel content and stirrup ratio was studied. Strength attenuation, ductility, energy consumption capacity and other aspects of the law and characteristics. The results show that under the action of low cyclic loading, the properly designed section steel beam with high - strength and high - performance is generally bent and damaged, and has good ductility and seismic energy dissipation capacity. With the increase of horizontal displacement amplitude and cycle number , The damage of the frame beam gradually accumulates, so that the strength and rigidity of the beam gradually deteriorate, and the energy dissipation capacity decreases. However, with the increase of steel content and stirrup ratio, the degradation range of strength and stiffness decreases, and the cumulative energy dissipation capacity increases. The research results provide experimental support for further establishing a seismic damage model that can describe the degree of damage of the beam of high-strength high-strength concrete beams and revealing the influence of damage on the mechanical properties of the frame beam.