SEISMIC BEHAVIOR OF CFST COLUMN TO BEAM JOINT WITHOUT WELDING IN CONSTRUCTION FIELD:THEORETICAL STUDY

By means of analyzing the mechanical characteristics and failure model of RC beam to CFST column joint without welding, a three-stage skeleton curve model is presented.In the elastic stage, the initial stiffness is evaluated by solving the stiffness matrix.In the perfect plastic stage and strength degradation stage, the ultimate strength and the degradation stiffness of the joint can be obtained with the limit equilibrium method.In order to verify the theoretical model presented above, finite element analysis results are compared with the theoretical results.It is suggested that the three-stage skeleton curve model can be used to depict the mechanical behavior of this new type of joint.