Check for Sliding as per BS 8110

Check for Sliding : The check for sliding is carried out for pad foundations only. If there is no hor izontal force acting on foundation check for sliding is not required. Resultant Force on foundation: Hd = [(Fx,sup)2 + (Fy,sup)2]0.5 Resultant Force Angle αHd = tan-1 [(Fy,sup / Fx,sup)] where Fx,sup = horizontal force acting on support in X-dir. (from analysis) Fy,sup = horizontal force acting on support in Y-dir. (from analysis) Resistance to sliding due to base friction: Hfriction = [-P + Fswt] * tanδ  tanδ  , where δ = design base friction – friction – user  user input Passive pressure coefficient: Kp = (1+sinΦ’) / (1(1 -sinΦ’), sinΦ’), where Φ’ = design shear strength of soil – user –  user input Passive resistance of soil in X direction: Hxpas = 0.5*Kp*(h2 +2*h*hsoil)*Lx* ρsoil Passive resistance of soil in Y direction: Hypas = 0.5*Kp*(h2 +2*h*hsoil)*Ly* ρsoil Resultant Passive Resistance: Hres,pas = abs(Hxpas*cos αHd) + abs(Hypas*sin αHd) Total resistance to sliding: RH.d = (Hfriction + Hres,pas) / 1.5 If RH.d ≥ Hd The check for stability against sliding passes