摩擦-屈服两级耗能的装配式梁柱节点抗震性能及功能可恢复性研究OA

To balance the seismic performance and earthquake-resilience of prefabricated steel frame structures,a prefabricated beam-column joint with friction-yield double-phased energy dissipation(PBCJ-DPED)is proposed,which achieves damage control and earthquake resilience.Based on the damage control concept,four PBCJ-DPEDs were designed and fabricated,with design parameters including slip lengths of 2 mm,4 mm,and 12 mm,and energy-dissipation plate widths of 140 mm and 160 mm.Meanwhile,a conventional cover plate spliced beam-column joint(CPSJ)was designed as the contrast.The failure mode,load-deformation characteristics,energy dissipation behavior,and energy dissipation concentration characteristic were investigated through quasi-static tests.The full-process mechanical mechanism of the PBCJ-DPED was revealed based on the finite element model.The mechanical performance of the original and repaired PBCJ-DPED was compared to evaluate its earthquake resilience.Results demonstrated that,compared with CPSJ,PBCJ-DPED exhibited full and stable hysteresis behavior,with favorable bearing capacity,deformation capacity and energy dissipation capacity.PBCJ-DPED experienced three distinct stages of elastic stage,slipping stage and bearing stage during the whole loading process.At the initial loading,PBCJ-DPED remained elastic,and as the load increased,relative slip occurred in the slip energy-dissipation plates,resulting in the obvious load platform in the hysteresis curves.When the bearing action was generated,the bearing capacity was significantly enhanced while the deformation growth slowed down.The strain in the connection region developed most quickly and yielded,whereas the beam and column members remained essentially elastic.The plastic behavior was predominantly concentrated to the connection region,where the dissipated energy accounted more than 85％of the total energy dissipation,demonstrating favorable energy dissipation concentration characteristic.The repaired PBCJ-DPED developed similar hysteresis characteristics with the original one,and the bearing capacity and energy dissipation capacity was recovered more than 90％and 80％,respectively.It indicates that the proposed PBCJ-DPED possesses satisfactory earthquake resilience.