装配式可更换梁段翼缘开孔削弱型节点抗震性能研究OA

[Purposes]A novel type of prefabricated replaceable joint with beam flange openings is proposed to effectively prevent brittle damage at beam-column joint of steel beams and facilitate rap-id post-earthquake structural repair.[Methods]A numerical simulation study was conducted to in-vestigate the seismic performance of the new joint by utilizing the finite element analysis software ABAQUS.First,the accuracy of finite element model was verified.Second,the seismic performances of new joints,conventional beam-column welded joints,and prefabricated splice joint with unweak-ened steel beam under cyclic loading were compared.Finally,a variational parameter analysis of the new joint was performed to investigate the effect of the opening radius and the number of openings on the seismic performance of the proposed joint.[Results]The results demonstrate that the new joint can efficiently transfer plastic hinges to replaceable beams,and that beam-post joints remain elastic un-der seismic action and can be easily replaced after earthquakes.As the opening radius increases,the joint load capacity gradually decreases while the energy dissipation capacity increases.However,both stiffness degradation and ductility coefficient are unsatisfactory.The recommended radius of the open-ing should be 0.26 times the outward width of the beam flange.As the number of openings increases,the joint load capacity decreases slightly and the stiffness degradation rate does not increase significant-ly.The complexity of the processing technology necessitates a recommendation for 4 openings,which can effectively ensure the joints energy dissipation capacity and provide sufficient ductility.