Optimization of Gusset Plate in Special Concentrically Braced Frames

Special concentrically braced frames (SCBFs) provide resistance to lateral force acting on a system in seismic design due to their ability in providing high strength, ductility and stiffness. Brace connected to beam column through gusset plate. Gusset plate play vital role in high risk seismic region in SCBFs. Gusset plate connections tolerate large inelastic deformations after buckling of the brace and end rotation and inelastic deformation post buckling of the brace .To achieve end rotation, using linear clearance, large plate and rigid connection. As result connection may be uneconomical. A research program was conducted to improve the gusset plate connection in SCBFs using elliptical clearance. Elliptical clearance gusset plate, attain good ductility, more compact, small, flexible and economical. In current design, Using tapered gusset plate good end rotation, reduce the sizes of gusset plate and more likely to yield. In this paper mainly focused on shape optimization of gusset plate in special concentrically braced frame including geometry, clearance, degree of taper, filleting and thickness of gusset also determine the pattern of stress in gusset plate Using tapered gusset plate, gusset plate elliptical filleting and gusset plate reverse elliptical filleting.