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通过3个再生混凝土框架梁柱中节点试件在低周反复荷载下的加载试验,对其破坏形态、滞回性能、延性特征、刚度退化等进行了研究,为再生混凝土结构的工程应用提供试验依据和理论基础。研究结果表明:再生混凝土节点受力和破坏过程可分为初裂阶段、通裂阶段、极限阶段、破坏阶段;节点核心区剪切破坏时,混凝土多沿再生骨料新老砂浆界面呈酥松状破坏,表现出明显脆性性质;增加箍筋数量,可以提高节点核心区的受剪承载力;在核心区发生剪切破坏前,梁根部纵筋能够充分发挥变形能力,滞回曲线较为丰满;施加轴向压力,可延缓节点裂缝的开展,抑制梁纵筋黏结滑移,有助于提高试件的抗震性能;再生混凝土试件具有一定的延性和耗能能力,通过合理的设计可以用在抗震设防地区。
The failure modes, hysteretic behavior, ductility characteristics and stiffness degradation of the joint specimens of three reclaimed concrete beams and columns were studied under low cyclic loading, which provided the experimental basis for the engineering application of recycled concrete structures. Theoretical basis. The results show that the process of stress and failure of recycled concrete joints can be divided into primary cracking stage, cracking stage, limit stage and failure stage. When the core region of the joint is damaged by shear failure, The shear strength of the core region can be increased, and the shear capacity of the core region of the node can be increased. Before the shear failure occurs in the core region, the longitudinal reinforcement at the root of the beam can fully exert the deformation capability and the hysteresis curve is relatively full; Axial pressure can delay the development of joint cracks and restrain the bond-slip of beam longitudinal reinforcement, which can help to improve the seismic performance of the specimens. Recycled concrete specimens have some ductility and energy dissipation capacity, which can be used in earthquake-resistant Fortification area.