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为研究钢骨超高强混凝土柱-钢骨普通混凝土梁组合框架的抗震性能,按1/4缩尺比例制作了两个两跨三层框架模型试件,其中一个为钢骨普通强度混凝土框架模型对比试件。通过低周反复荷载试验,研究了两个框架模型试件的破坏形态、荷载-位移滞回曲线、水平承载力、位移延性、耗能能力、承载力退化和刚度退化等抗震性能,并进行了对比分析。试验结果表明:在试验轴压比为0.38时,二者均能实现梁铰破坏机制,荷载-位移滞回曲线均较饱满,两框架的整体及各层间位移延性系数均大于3.0,具有良好的延性;在承载能力、位移延性、耗能能力、承载力退化和刚度退化等方面,组合框架优于钢骨普通强度混凝土框架,表明在超高强混凝土中通过合理地配置钢骨和高强箍筋,既能充分发挥其高强抗压性能,提高承载能力,又能改善其脆性,增强构件延性,从而提高框架结构体系的抗震性能。
In order to study the seismic performance of SRHC-SRC composite frame, two two-span and three-story frame specimens were made at a scale of one-fourth of the scale. One of them was a normal strength concrete frame model Contrast test pieces. The failure modes, load-displacement hysteretic curves, horizontal bearing capacity, displacement ductility, energy dissipation capacity, bearing capacity degradation and stiffness degradation of the two frame model specimens were studied by low-cycle cyclic loading test. Comparative analysis. The experimental results show that both of them can achieve the beam hinge failure mechanism and the load-displacement hysteresis curves are all full at the axial compression ratio of 0.38, the displacement ductility coefficients of the whole frame and each layer of the two frames are all greater than 3.0, which is good The ductility of the composite frame is better than that of ordinary steel reinforced concrete frame in the aspects of bearing capacity, displacement ductility, energy dissipation capacity, bearing capacity degradation and stiffness degradation. It is shown that in the ultra-high-strength concrete, , Can not only give full play to its high strength and compressive properties, improve the carrying capacity, but also improve its brittleness and enhance the ductility of components to improve the seismic performance of the frame structure system.