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通过对两榀再生粗骨料取代率为100%,粉煤灰等量取代率为15%的改性再生混凝土框架中节点的试验,探讨粉煤灰作为外加剂的改性再生混凝土框架节点的破坏机制、滞回曲线、刚度退化、能耗性能、延性特征等抗震性能。试验表明:改性再生混凝土中节点破坏过程均经历初裂、通裂、极限、破坏四个特征阶段;节点核心区破坏时混凝土呈酥裂状破坏,表现出明显脆性性质;梁根部适量配置纵筋,在核心区发生剪切破坏前,能够充分发挥变形能力,滞回曲线较为丰满;轴向压力的施加,改变了核心区主拉应力方向,延缓了节点裂缝的开展;再生混凝土试件具有一定的延性和耗能能力,能够满足抗震性能要求。
Through the test of the nodes in the modified recycled concrete frame with the substitution rate of 100% for two-fold recycled coarse aggregate and the replacement rate of fly ash equal to 15%, the effects of fly ash on the joints of modified recycled concrete frame as additive Failure mechanism, hysteresis curve, stiffness degradation, energy consumption performance, ductile characteristics and other seismic performance. Experimental results show that the failure process of the joints in the modified recycled concrete all undergoes four characteristic stages of primary cracking, cracking, limiting and failure. When the core region of the core is damaged, the concrete cracks in a crisscross pattern and shows obvious brittleness. The deformation of hysteresis curve can be fully exerted and the hysteresis curve is relatively full before the shear failure occurs in the core zone. The application of axial pressure changes the direction of the principal tensile stress in the core zone and delays the crack propagation in the core zone. The recycled concrete specimen has A certain degree of ductility and energy consumption, to meet the seismic performance requirements.