Study On Mechanical Performance Of Semi-rigid Connection Of Concrete-filled Steel Tubular Composite Frame

The influence of joints rigidity to mechanical properties of frames cannot be ignored inthe structure design. With the further research on the joint connection of semi-rigid and referto the related semi-rigid connection research results of the steel frame, it has a great guidingsignificance to the practical engineering to discuss the static performance and dynamicperformance of the semi-rigid connection of concrete-filled steel tubular structure. This paperdevotes to researching the static performance and dynamic performance of the semi-rigidconnection of composite frame with concrete-filled steel tubular columns which semi-rigidjoints was simulated with rotation spring model. The main research work includes:(1) Based on the choices of the reasonable constitutive model and the simulation methodof the semi-rigid joint, the semi-rigid connections with the frame model of concrete filledsteel tubular plane was established by using the finite element software ABAQUS. There areless experiments of the semi-rigid connections with concrete-filled steel tubular frame. As aresult, the load-displacement curve of the semi-rigidly connected frames and the concretefilled steel tube frame with reinforcement ring type joint given semi-rigid properties. Also theresults were compared with the existing tests results to verify the validity of the model.(2) Through the analysis of the effect of semi-rigid connection to the internal force anddeflection in vertical of concrete filled steel tubular composite frame and the displacement ofthe lateral frame under the horizontal load, the influence of semi-rigid connections to thestatic performance of the concrete filled steel tubular composite frame was studied.. Theinfluence of the semi-rigid connections to the natural vibration period and the basic mode ofthe concrete filled steel tubular composite frame were analyzed, and the influence ofsemi-rigid connections to the dynamic performance of concrete filled steel tubular compositeframe was also studied(3) The plane frame model was chosen in the analytical process, and the influence offloor to the frame was considered by using the method of the actual stress equivalent touniformly distributed load. Therefore, it is necessary to analyze the semi-rigid connectionspace frame. In order to provide the reference for the further research on the mechanicalproperties of the space semi-rigid concrete filled steel tube combination frame, the modelingof the space frame are also discussed.