STUDY ON SEISMIC BEHAVIOR OF JOINT WITH EXTERIOR DIAPHRAGMS BETWEEN CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMN AND STEEL BEAM

Based on the experiments of joint with exterior diaphragms between concrete-filled square steel tubular column and steel beam under cyclic loading,with appropriate material stress-strain relations and failure criteria,the mechanical properties of this type of joint were researched by using ANSYS,finite element analyses were conducted under cyclic loading,the hysteretic and framework curves of this type joint between test and theoretical were researched.The study results showed that all specimens have good ductility and energy dissipation capacity.The story angle drift ductility ratios are = 3.07 ～ 3.66,the elastic and elastic-plastic story angle drift are y = 0.004 1 ～ 0.004 7 and u = 0.012 4 ～ 0.017 2,and the equivalent viscous damping coefficients are he = 0.26 ～ 0.35,which meet the needs of the current code for seismic design of building.