Experimental And Finite Element Analysis Research On Seismic Behavior Of Joints Between Steel Tubular Columns And Double I-beams In Imitated Ancient Building

As ancient Chinese architecture, imitated ancient building are so graceful in shape,grand and magnificent. They are being widely used in engineering structures in recentyears. Lintel, sub-lintel and eave column form double beam-column joints in imitatedancient building. It is found that the form and mechanical characteristics of these jointsare different form the general joints, and the failure mode of these joints are not fullyresearched in test and theoretical research. It is necessary to study the performance ofjoints between steel tubular columns and double I-beams, having a good theoreticalsignificance and practical value in engineering.In this paper, according to the experimental research of four joints between steeltubular columns and double I-beams in imitated ancient building, through specimens ofdifferent axial compression ratio and node types were tested under low-cyclic reversedloading, the process of stress and failure characteristics of joints were observed. Thesteel structure of double beam-column joints, the hysteretic performance, bearingcapacity, inter-story drift ratio, degeneration of strength and rigidity, ductility andenergy dissipation capacity were analyzed. The study indicate that the hysteresis loopsof the joints are in a plump-shape, the joint panel zone has good ductility and energydissipation capacity, the ultimate elastic-plastic story drift rotation is about1/50~1/24.The joint panel zone is divided into three districts by the double beams. The studyresults indicate that the main failure mode of joints are the shear bucking failure in theC core area of panel zone, and the flange of columns were buckled in the B core area of panel zone, and some welds and their hearted affected areas were cracked.Non-linear elasto-plastic finite element study about the steel structure of doublebeam-column joints with software ABAQUS based on the experimental study wascarried out, the analytical results are in good agreement with the experimental results.The failure mode, the law of stress distribution and development of the joints are deepanalyzed. Parametric study of load-displacement curves of the frame were carried outbased on the early analysis. The axial compression ratio, steel strength and thethickness of the wall in the core area were all considered as analysis parameters,influential regulation of bearing capacity, rigidity and ductility were observed, and thefurther research on the law of stress distribution and development under differentparameters were obtained.The research results will provide reference for the seismic design and practicalapplication of the steel structure of double beam-column joints in imitated ancientbuilding, and be helpful for the further research on the double beam-column joints.