Seismic Performance Research on Truss Joints

Seismic performance research on truss joints focuses on the hysteretic characteristics and failure mechanisms of typical joints such as K-type and T-type. Finite element simulations and experimental analyses reveal that the bearing capacity of the joints is significantly affected by the wall thickness of the main chord, the angle of the brace, and the welding quality. Strengthening with outer sleeves can increase the ductility coefficient by more than 30%. The research indicates that reasonable design of joint configurations (such as increasing the intersection radius and using high-strength steel) can effectively avoid brittle fracture and achieve the seismic goal of "strong joints and weak members."

Compared with designs without braces, cross-braced truss joints have higher shear bearing capacity and energy dissipation capacity, with full hysteresis curves and stable backbone curves. During construction, it is recommended to use embedded steel plates or chord members directly embedded in the joint scheme, and to set up annular ribs to enhance the anti-extrusion strength to ensure the structural safety under seismic action.