Special Concentrically Braced Frames (SCBF) per AISC 341-16 F2

Symbols

E = modulus of elasticity of steel, ksi (MPa)
L_c = effective length of brace = KL, in. (mm)
K = effective length factor
r = governing radius of gyration, in. (mm)

Basis of Design

According to AISC 341-16, Special Concentrically Braced Frames are expected to provide significant inelastic deformation capacity primarily through brace buckling and yielding of the brace in tension.

Members

Basic Requirements

Columns, beams, and braces should provide the requirements of Section D1.1 for highly ductile members.

Diagonal Braces

Braces should provide:

• Slenderness ratio: L_c/r ≤ 200

• The brace’s effective net area is not less than the brace’s gross area.