Research on Seismic Performance and Restoring Force Model of Mid-column Joints in Steel Frame with Cellular Beam
Based on the study of the seismic performance of mid-column joints in steel frames with celluler beams,a restoring force model skeleton curve for these joints is proposed,providing a theoretical basis for similar engineering applications.Numerical simulations were conducted on 18 joints of mid-column joints with celluler beams,varying parameters such as opening ratio,opening position,and hole shape.The seismic performance,including hysteresis behavior,bearing capacity,stiffness degradation,ductility,and energy dissipation,was analyzed to develop a restoring force model for these nodes.When circular hole openings are positioned at 0.75 to 1 times the beam height,and hexagonal hole openings at 1 to 1.25 times the beam height,with an opening ratio between 60%and 65%,plastic hinge relocation can be achieved,significantly influencing on bearing capacity,ductility,and energy dissipation of the joint.The skeleton curve of the proposed restoring force model aligns well with the simulation results.Celluler beam mid-column joints exhibit good seismic performance and facilitate the formation of a beam-hinge mechanism.The restoring force model proposed in this paper can serve as a reference for elastic-plastic response analysis and seismic analysis of such joints in engineering practice.
mid-column joints in steel frame with cellular beamfinite element analysisseismic performancerestoring force model