Assessment of the Design Criteria for Concentric V-Braced Steel Structures According to Italian and European Codes

Table 1: Design criteria for steel CBF-V structures according to NTC08.

Bracing			Class sections 1 or 2; for circular hollow sections: d/t ≤ 36



Beam
Column
q-factor	Ductility Class	High	2.5
		Low	2
where: d and t are diameter and thickness of the circular hollow profile, respectively; N_Ed is the brace design axial force; N_pl,Rd is the brace plastic resistance; N_b,Rd is the brace buckling resistance; is the brace normalized slenderness; Ω is the over-strength factor; γ_Rd is the steel over-strength factor that is the ratio between the average and the characteristic values of the yielding strength; γ_pb is a factor representative of the residual brace strength after buckling; N_EdG is the axial force corresponding to non-seismic loads and N_EdE is the axial force corresponding to seismic loads.