Hysteretic Behavior Of Sloped Top-and-Seat Angle Connections

Architectural design is becoming more and more novel and complex,and various sloped beam-column connections have been proposed.However,there is no standard to guide the design of such connections,and there is also a lack of research on this special type of connections.The top and seat angle with two web angle connection is a typical semi-rigid connection,which is composed of top and seat angle and double web angle.Current research shows that this kind of connection has greater rotational rigidity,flexural bearing capacity,deformation capacity and energy dissipation capacity.It is strong and easy to replace after earthquake.Based on this point,this paper proposes a four-angle connection applied to the sloped beam-column.It can be applied to the beam-column connection at any angle.The arc-shaped angle is adopted to connect the flanges of steel column and beam,and the web angle still used right-angle.The proposed connections were systematically studied by a combination of experimental research and numerical simulation.The following is the main research content of this article:(1)A total of six specimens were designed,respectively considering three angles of 0°,15°,and 30°,with two specimens for each angle,one without stiffener and one with curved stiffener.The cyclic loading was applied on each specimen,and the mechanical properties such as failure mode,hysteresis performance,and skeleton curve of each specimen were evaluated.(2)A refined finite element model was established,each specimen was simulated,and the deformation mode,hysteresis curve,skeleton curve,etc.were compared one by one to verify the correctness of the finite element simulation.(3)The finite element simulation of the single arc angle in the connection was carried out,and 37 finite element models were established.The influence of the parameters of the single arc angle on its hysteresis performance was comprehensively analyzed.Based on the simulation results,the restoring force model of single arc angle was proposed.(4)Establish a full-scale finite element model of the sloped connection,conduct a systematic parameter analysis,and evaluate the influence of each parameter on its hysteretic performance.