Numerical Simulation And Analysis On Semi-Rigid Beam-Column Joints With Extended End-Plate Connection

Bolted end-plate connection is one of the main connections for the steel structures, which has many advantage. For example: convenient for construction high resistance ability, and large stiffness. The beam-to-column joints are considered to be rigid or pinned in the passed designing method and calculation. Actually, most of the connections are semi-rigid, whose force forms are between the pinned and rigid, because it is very complicated to reach full pinned or full rigid, generally, we call it semi-rigid connections.First, this article intruduces the research background of semi-rigid connections and the study at home and abroad. Summary and investigation of calculation of semi-rigid connections are carried on a systematic classification and method of study . Semi-rigid connections with extended end-palate as one kind of semi-rigid connections are conducted a thorough study. Second, at the basis of experimental study on semi-rigid connections with extended end-palate and top angle, a node of this type under cyclic load are carried on numerical simulation and analysis and the whole process of node under cyclic load is obtained by using the basis theory of finite element method. Finally, at the basis of numerical simulation and analysis of semi-rigid connections with extended end-palate under cyclic load, 9 nodes of this type of different size under cyclic load are conducted on numerical simulation and analysis. Hysteresis curve and the stiffness degradation curve of node under cyclic load are obtained. Energy performance and ductility of this connection are researched. Hysteresis model of this connection is established initially. Theoretical foundation and basis are provided to seismic design of steel frames with semi-rigid connections.