高强螺栓对蜂窝梁-柱端板连接节点力学行为的影响

Effect of High-strength Bolt on Mechanical Behavior of Castellated Beam-to-Column End Plate Connections

目的 研究不同等级高强螺栓的拉力和撬力分布规律以及对蜂窝梁-柱端板连接节点的破坏形式和滞回性能的影响,为后续研究提供参考。方法 应用ABAQUS建立数值模型,在与试验结果吻合的基础上,分析螺栓等级、直径、预紧力和端板厚度等参数对蜂窝梁-柱端板连接节点性能的影响。结果 蜂窝梁可以起到转移塑性铰的作用,减小连接处端板变形;端板-梁翼腹板双铰耗能破坏的节点延性和耗能性能更好;端板厚度相同时,螺栓直径和预紧力对节点极限承载力的影响较小;撬力随螺栓直径和预紧力的增加而减小,随端板厚度增加而增大。结论 端板厚度增加有利于蜂窝孔的应力迁移作用,使节点发生端板-梁翼腹板双塑性铰耗能破坏,但撬力影响不可忽略;随螺栓直径和预紧力的增大,选用较厚端板的节点破坏模式由端板强铰向梁强铰转化。

This paper was proposed to study the failure mode,hysteretic performance,bolt tension and pry force of castellated beam-to-column end plate connections affected by high-strength bolts,and to provide reference for subsequent research.A numerical model was established by using ABAQUS,and the effects of bolt grade,diameter,preload and end plate thickness on the performance of castellated beam-to-column end plate connections were analyzed based on the results of test.The castellated beam can transfer the plastic hinge and reduce the deformation of the end plate.The ductility and energy dissipation performance of end plate-beam-wing web joints are better.When the end plate thickness is the same,the bolt diameter and preload have little influence on the ultimate bearing capacity of the connections.The prying force decreases with the increase of bolt diameter and preload,and increases with the increase of end plate thickness.The increase of the end plate thickness is beneficial to the stress migration of the opening,which causes the energy dissipation failure of the end plate-beam-wing web double plastic hinge at the joint point,but the influence of the prying force cannot be ignored.With the increase of bolt diameter and preload,the failure mode of joints with thicker end plates is transformed from strong hinge of end plate to strong hinge of beam.