Impact On Load And Finite Element Analysis On Cold-Formed Thin-Walled C Steel Beam-Column Joints Of Connections With Plate

Cold-formed thin-walled C steel sections are lightweight materials and suitable for building construction owing to their high structural performance and durability. They are widely used as purlins and side rails in the building envelopes of industrial building. Because of cold formed thin-walled light steel structure's special construction, if draws the mechanics model according to the rigid connection frame, that will be over-evaluated the bearing capacity of the structure; And if draws mechanics model according to the pinned connection frame, when the foot also adopts this kind of structural form according to the frame connections, that will form organization, and the calculation will be unable to go on. So for being rational to predict the bearing capacity of system, it should consider in the analysis and design of the structure the true nonlinearity of the connections, that is the influence of the semi-rigid connection.This thesis fetches cold-formed thin-walled C steel beam-to-column connections with gusset plate without chamfers connecting for being researched object in cold-formed thin-walled light steel structure system, have done the following three parts of research work to the performance of beam-to-column connection:(1) The experiments of 5 full size cold-formed thin-walled C steel beam-to-column connections with gusset plate without chamfers connecting.(2) The experiments have tested the rigidity of connections that is the M-θcurve of connections, researched a kind of destruction four modes of beam-to-column connections:①bearing failure in section web around bolt hole;②lateral torsional buckling of gusset plate;③flexural failure of gusset plate;④flexural failure of connected cold-formed steel section, analyzed stress of the plate and the influence of the member's plate thickness, the quantity of gusset plate, the interval of gusset plate to the rigidity of connections.(3) Through the finite element analyses of the beam-to-column connections, the further studying is going on which analyzes the influence of the member's plate thickness, the interval of self-drilling screws to the rigidity of connections and the stress of the plate. Nonlinear finite element simulative computing analysis of the joint with the use of ANSYS.