Parametric study on the I-shape brace connection of conventional concentrically braced frames

Concentrically braced frames (CBFs), designed using the conventional linear elastic method without seismic proportioning and detailing requirements, are referred to as Conventional CBFs (CCBFs) in this study. They widely used moderate low areas North America due ease of design economy. Without a code specified dedicated fuse member dissipate earthquake induced energy, or prescribed yield/failure hierarchy, brace connection CCBF is usually weakest link lateral load-carrying path prone fracture. The therefore determinant for structural performance. In paper, parametric study based on validated numerical simulation procedure was carried out typical I-shape connection, i.e. flange plate connection. Three key parameters, namely, gusset thickness, lap web were varied their effects both compressive tensile behaviour assembly. Various possible failure modes revealed compression tension. results showed that end restraint provided by connections CCBFs significant; pinned-end assumption would lead conservative estimation buckling resistance, which might trigger detrimental buckling. overstrength plate, presence transverse stress along net section, quantified von Mises criterion. Design recommendations proposed with regards attaining better deformation capacity.