预应力CFRP筋-螺纹钢筋-型钢/混凝土偏拉构件抗震性能试验

Experiment on seismic performance of prestressed CFRP tendons and rebars-steel reinforced concrete eccentrically tensioned members

  • 摘要: 为研究预应力碳纤维增强树脂复合材料(CFRP)筋-螺纹钢筋-型钢/混凝土(SRC)偏拉构件的抗震性能,对4根预应力CFRP筋-SRC偏拉构件、4根预应力螺纹钢筋-SRC偏拉构件和3根普通SRC受拉构件进行了低周反复荷载对比试验,试验参数包括偏心距、预应力张拉水平、竖向拉力、预应力筋类型。研究结果表明:所有构件的破坏形态均为弯剪破坏,构件滞回曲线均较饱满,延性较好。随着偏心距的增大,各构件承载力、延性及耗能能力均相应降低;随着预应力张拉水平的增大,构件承载力有一定提高,但耗能能力降低,延性系数先增后降,且增加幅度大于降低幅度;随着竖向拉力的增大,预应力CFRP筋-SRC偏拉构件的承载力、延性及耗能能力均相应降低。相较于普通SRC受拉构件,预应力CFRP筋-SRC偏拉构件具有更好的承载力、刚度、延性和抗裂能力,但耗能能力低;相较于预应力螺纹钢筋-SRC偏拉构件,预应力CFRP筋-SRC偏拉构件的承载力和延性较低,但耗能能力强。

     

    Abstract: In order to investigate the seismic performance of prestressed carbon fiber reinforced polymer (CFRP) tendons and rebars-steel reinforced concrete (SRC) eccentrically tensioned member, the low reversed cyclic loading tests of four members of prestressed CFRP tendons-SRC eccentric tension, 4 members of prestressed rebar-SRC eccentric tension and 3 members of ordinary SRC tension were conducted. The test parameters include eccentricity, prestressed tension level, vertical force and the types of prestressed tendon. The results show that the failure modes of all the members are bending shear failure, and the hysteretic curves of all the members are full and the ductility is good. With the increase of eccentricity, the bearing capacity, ductility and energy dissipation capacity of each component decrease accordingly. With the increase of the prestress tensile level, the bearing capacity of the component increases to a certain extent, but the energy dissipation capacity decreases, and the ductility coefficient increases first and then decreases, and the increase range is greater than the decrease range. With the increase of vertical tensile force, the bearing capacity, ductility and energy dissipation capacity of the prestressed CFRP tendons-SRC eccentric tensile member decrease correspondingly. Compared with the ordinary SRC tensile member, the prestressed CFRP tendons-SRC eccentric tensile member has better bearing capacity, stiffness, ductility and crack resistance, but lower energy consumption capacity. Compared with the prestressed rebar-SRC eccentric tensile member, the prestressed CFRP tendons-SRC eccentric tensile member has lower bearing capacity and ductility, but higher energy dissipation capacity.

     

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