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创建了一个剪切破坏的钢筋混凝土梁-柱节点试验试件的大型数据库。所有的试件(对于普通的节点至少有最小的横向增强约束)承受循环横向荷载,没有面外受力构件(横向的梁或板)。数据库中的主要类别包括节点剪切破坏的类型(有连接、无连接、纵向梁增强的屈曲)以及联结的类型(内、外和屈曲节点)。对确定关键点(体现了最显著的刚度变化)上的剪应力和/或应变性能的影响参数进行了评估。混凝土裂缝以及横向和纵向梁增强节点的屈曲,从全部和局部性能到节点剪切破坏(最大的试验楼层剪力)的初始点,都引发了刚度上很明显的变化。通过材料性能、节点板的几何特征、增强约束、柱的轴向荷载和增强粘结条件,对节点剪力性能的影响参数进行分组。研究发现,对于不同的连接类型和破坏模式次序,节点剪力性能的最重要影响参数有些不同。然而,在数据库所有数据中,混凝土压应力是节点剪力性能最普遍的控制参数。此外,通过简单的方程研究了节点剪切裂缝的应力和应变(表现在第一个明显刚度变化的点)。最后,用AC352R-02推荐的设计校正方法对数据库中的构件进行了验证。
Created a large database of shear failure specimens of reinforced concrete beam-column joints. All specimens (at least minimal transverse reinforcement for normal joints) were subjected to cyclic lateral loads without an out-of-plane force member (transverse beam or plate). The main categories in the database include the types of node shear damage (with connections, no connections, buckling reinforced by longitudinal beams) and the type of coupling (inner, outer, and buckling nodes). The parameters affecting the determination of shear stress and / or strain behavior at the key points that characterize the most significant changes in stiffness were evaluated. Concrete cracks, as well as the buckling of the transverse and longitudinal beam-reinforced joints, all lead to significant changes in stiffness, from the full and local properties to the initial point of shear failure (the largest test floor shear). The influence parameters of the joint shear properties are grouped by the material properties, the geometric characteristics of the gusset plate, the reinforcement constraints, the axial load of the columns and the conditions of the bond. The study found that the most important influencing parameters of node shear performance are different for different connection types and failure mode sequences. However, among all the data in the database, compressive stress of concrete is the most common control parameter of joint shear performance. In addition, the stress and strain of the shear cracks in the joints were studied by simple equations (at the point of the first obvious change in stiffness). Finally, the components in the database were validated by the design correction method recommended by AC352R-02.