Simplified Shear Method

Eriksson Pile uses the a simplified shear method as described in PCI BDM 20.9.3.4 utilizing LRFD 5.7.3.3. This method designs the pile as a traditional reinforced concrete section and includes the shear strength of the concrete and the shear strength of the transverse reinforcement for load cases that result in pile compression. For load cases in tension it is recommended to neglect shear strength of the concrete and reinforce to resist all shear assigned to the pile. In addition to this the values for β, θ, and λ are assumed to be 2.0, 45°, and 1 respectively which should result in a conservative design. These values may be overridden in the Analysis Options Input panel.

Shear Design

[LRFD Eq. 5.7.3.3-1]

[LRFD Eq. 5.7.3.3-2]

where:

V_n = nominal shear resistance

V_c = nominal shear resistance of the concrete

V_s = nominal shear resistance of the spiral

V_p = component of prestressing force in the direction of the shear force

f^’_c= concrete strength

b_v = effective web width taken as the minimum web width within the depth d_v (LRFD Art. 5.7.2.8)

d_v = effective shear depth (LRFD Art. 5.7.2.8)

h = pile width

λ = concrete density modification factor

α = angle of inclination of transverse reinforcement to longitudinal axis

β = factor of diagonally cracked concrete to transmit tension and shear

λ_duct = shear strength reduction factor

A_v = area of transverse reinforcement

f_y = transverse yield strength

s = spacing of transverse reinforcement measured in a direction parallel to the longitudinal reinforcement