目的 提出一种蜂窝梁H型柱绕弱轴向端板连接节点,探究节点抗震性能及不同因素对其影响规律,为相关设计提供借鉴.方法 理论分析蜂窝梁H型柱绕弱轴向端板连接节点传力机制,建立并验证蜂窝梁 H 型柱绕弱轴向端板连接节点ABAQUS模型,研究端板厚度、开孔率对节点初始转动刚度、承载能力、耗能能力、延性、刚度退化及破坏形式影响规律.结果 蜂窝梁H型柱绕弱轴向端板连接节点弯矩最终由柱腹板与正向端板抗弯、柱翼缘与侧向端板抗剪承担;剪力最终由高强摩擦型螺栓连接面间摩擦力承担;端板厚度及开孔率越大,节点耗能进入蜂窝梁耗能阶段越早,连接刚度足够时节点抗震性能主要取决于蜂窝梁.结论 提出了蜂窝梁H型柱绕弱轴向端板连接节点弯矩路径传递分配系数计算方法,建议节点端板厚度应大于 1倍柱翼缘厚度,开孔率取值为60%～65%.
Research on Seismic Performance of Weak-axis Castellated Beam-H-shaped Column End-plate Connection Joint
A weak-axis castellated beam-H-shaped column end-plate connection joint was proposed to investigate the factors and influencing laws of seismic performance.The aim is to provide a reference for relevant design.The force mechanism of the weak-axis castellated beam-H-shaped column end-plate connection joint was theoretically analyzed,and an ABAQUS model was established and verified.The influence of end plate thickness,opening rate on the initial rotational stiffness,bearing capacity,energy dissipation capacity,ductility,stiffness degradation,and failure mode of the joint were studied.The bending moment of the weak-axis castellated beam-H-shaped column end-plate connection joint is ultimately borne by the bending resistance of the column web and the forward end plate,and the shear resistance of the column flange and the lateral end plate;the shear force is ultimately borne by the friction between the joint surfaces of the high-strength friction bolts.Increasing end plate thickness and opening rate lead to earlier initiation of energy consumption stage in castellated beams.When connection stiffness is sufficient,seismic performance mainly relies on the behavior of castellated beams themselves.Furthermore,a calculation method for determining moment transfer distribution coefficient in weak-axis castellated beam-H-shaped column end-plate connections is provided as follows:it is recommended that the thickness of the end plate should be at least equal to one times that of the column flange;meanwhile,the range for acceptable values of opening ratio falls between 60%to 65%.
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