加强式端板连接节点的初始刚度与抗弯承载力

针对需要局部加强的梁柱端板连接节点,考虑了柱翼缘用背垫板加强,节点域柱腹板用补强板加强的构造形式.将节点分为若干组件,求各组件初始刚度;对其中经过加强的组件,采用理论推导和有限元分析相结合的方法得出初始刚度表达式;然后将各组件初始刚度进行组装,得到加强式端板连接节点初始刚度.用屈服线法推导出含背垫板柱翼缘的设计抗弯承载力表达式,参照现行规范推导出其余影响节点承载力的组件的设计抗弯承载力表达式,取其中抗弯承载力的最小值,得出加强式端板连接节点的设计抗弯承载力表达式.通过与有限元计算结果对比表明加强式节点初始刚度的计算方法具有足够的精确性,可用于节点刚性的判断和参数研究.

Initial stiffness and moment resistance of reinforced joint with end-plate connection

In beam-to-column joint with bolted end-plate connection,the structural details of column flange reinforced by backing plate and column web panel reinforced by supplementary plate are analyzed.The joint is divided into some basic components and the initial stiffness of each component is obtained.Especially,the initial stiffness of reinforced components is drawn by theoretical model and finite element analysis.The initial stiffness of reinforced joint can be obtained by assembling the initial stiffness of each component.The design moment resistance of column flange reinforced by backing plate is deduced based on yield line method and the design moment resistances of other components are deduced based on present codes.The design moment resistance of the reinforced joint is then determined by the minimum of the design moment resistances of all components.By comparison with the results of finite element calculation,it's verified that the method to calculate the initial stiffness of reinforced joint is accurate enough to be used to estimate the rigid behavior of the joint and to make parametric study.