Shear Friction Capacity (Interface Shear)

This calculation determines the shear friction capacity of concrete at a crack or joint

Code:
CA flagCSA A23.3
ϕ_c

Resistance factor for concrete

Constraints
min: 0step: 0.01
ϕ_s

Resistance factor for reinforcing steel

Constraints
min: 0step: 0.01
f_c(psi)

Specified concrete strength

Constraints
min: 0step: 100
f_y(ksi)

Specified reinforcing steel yield strength

Constraints
min: 0step: 1
λ

Concrete density modification factor; 1.0 for normal density concrete

Constraints
min: 0step: 0.01
A_vf(in²)

Area of reinforcing crossing the shear plane

Constraints
min: 0step: 0.01
N(kip)

Axial load; compression positive

Constraints
step: 1
t_s(in)

Slab / member thickness

Constraints
min: 0step: 1
b(in)

Effective width of cross section

Constraints
min: 0step: 1
surfaceType

The type of surface at the interface. If no surface prep has been performed, choose plain. Intentionally roughened surface requires hardened concrete to be cleaned and mechanically roughened to an amplitude of at least 5 mm (1/4 inch). Steel surface requires headed studs. It is not intended for smooth steel-on-concrete joints.

Shear friction in concrete

Calculation Steps:

    Coefficient of friction
    • Surface type = Intentionally roughened
    • c = 0.50 MPa = 0.0725 ksi
    • μ = 1
    Reinforcing ratio and normal stress
    • p_v

      Reinforcing ratio

    • σ

      Normal stress on the interface

      ksi
    Max permissible shear
    • v_rmax

      Maximum permissible shear stress per CSA A23.3 Cl. 11.5.1

      ksi
    • V_rmax

      Maximum permissible shear force

      kip
    Shear friction capacity
    • v_r

      Shear friction stress capacity per CSA A23.3 Cl. 11.5.1

      ksi
    • V_r

      Shear friction capacity

      kip
    User Notes: