Concrete Shear Friction Capacity (Interface Shear)

Output:

Definitions
• ϕ_v = Resistance factor for shear
• f_c = Specified concrete strength (psi)
• f_y = Specified reinforcing steel yield strength (ksi)
• λ = Concrete density modification factor; 1.0 for normal density concrete
• A_vf = Area of reinforcing crossing the shear plane (in²)
• N = Axial load; compression positive (kip)
• t_s = Slab / member thickness (in)
• b = Effective width of cross section (in)
• μ = Coefficient of friction
Coefficient of friction
• Surface = Intentionally roughened
• μ = 1 λ = (1) (1) = 1
Max permissible shear
• ϕV_n,max = ϕ_v b t_s * min( 0.2 f_c , (480 + 0.08f_c) , 1600 )/1000
• ϕV_n,max = (0.75) (12) (12) * 0.88
• ϕV_n,max = 95 kip
Shear friction capacity
• ϕV_n = ϕ_v μ (A_vf f_y + N) ≤ ϕV_n,max
• ϕVn = (0.75) (1) [(0.31) (60) + (0)] ≤ 95
• ϕVn = (0.75) (1) (18.6) ≤ 95
• ϕVn = 13.95 kip
User Notes:
User notesIntentionally roughened surface requires hardened concrete to be cleaned and mechanically roughened to an amplitude of at least 1/4 inch (5 mm)