| ABSTRACT:Cold-formed thin steel has high ratio of strength and weight, if it is used as the main supporting component of multi-story or low-rise steel structures, it will yield good economic returns. In building construction, cold-formed steel sections are usually bolted to hot rolled steel plate or sections to form simple and moment connections, its connection properties incline to be semi-rigid. However, despite their simplicity, simple connections between cold-formed steel sections have received relatively little attention.This paper, by means of finite element analysis, investigates the performance of cold-formed steel bolted-plate connections in details including the influence of sections. The main scope of this paper includes:Part I:3D Finite element models are established to analyze the nonlinear behavior of cold-formed steel bolted-plate connections taking the contact between plates into account with the finite element program ANSYS. The analysis results are compared with the experimental data, which indicating that the FEM results are creditable.Part II:According to fracture mode, M-θcurves and stiffness degradation calculated by total 36 FEM models, the moment-resisting behavior and moment-rotation relationships of connections with different parameters like width of web, bolt pitch, thickness of the hot rolled gusset plate, thickness of panel and width of flange have been investigated. And a few recommended values of these parameters have been discussed.Part III:The dynamic performance of three kinds of recommended connections have been preliminary studied in this paper. According to hysteretic curves, skeleton curves, ductility coefficient and energy dissipation coefficient calculated by models, the different hysteretic behavior of cold-formed steel bolted-plate connections with different member sections has been discussed. At last, the simplified mathematic model of hysteretic curve was obtained.
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