Sliding (Foundation)

The calculation is made according to EN 1997-1 6.5.3

The following inequality shall be satisfied:

• H_d < R_d + R_p,d
• H_d = horizontal load
• R_d = design shear resistance due to friction at plate bottom
• R_p,d = resistance due to earth pressure on the plate sides (not considered in the program).

Horizontal load

• H_d = H_x
  or
• H_d = H_y

If a horizontal load acts in both directions the resulting load will be calculated as:

• H_d = (H_x² + H_y²)^0.5

Shear resistance

Cohesionless soil, Over-consolidated clay and Medium soil

The calculation will be made for drained conditions

• R_d = (V_d tan δ_d) / γ_R,h
  • V_d = vertical load including dead load
  • δ_d = effective design friction angle
    • For cast-in-situ foundations: δ_d = φ_d'
    • For precast foundations: δ_d = 2/3 φ_d'
      • φ_d'= design friction angle
  • γ_R,h = partial resistance factor considering uncertainties in the analytical model is predefined for design approach 3

Normally consolidated clay

The calculation will be made for undrained conditions

• R_d = A_c' c_u / γ_R,h ≤ 0.4 V_d
  • A_c' = effective foundation area
  • c_u = undrained shear strength

Rock

• Plane grinded rock: R_d = 0.45 V_d
• Otherwise: R_d = 0.75 V_d

 Swedish Annex

• Plane grinded rock: R_d = 0.4 V_d
• Otherwise: R_d = 0.75 V_d