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EPART SIXAppendix EAASHTO LRFD METHODOLOGY LEVEL SURCHARGE - 250 PSF5) Geometric Parameters - AASHTO LRFDInternalExternalφ = 34 degrees φ = 30 degreesδ = β = 0 degrees (no backslope) δ = β = 0 degrees (no backslope)α = 90 degrees (90˚ + no batter) α = 90 degrees (90˚ + no batter)β = 0 degrees (level) β = 0 degrees (level)6) Rankine Earth Pressure CalculationInternalEquation (3g)k a = tan² (45 - φ/2)k a = 0.283 for above parameters - RankineEquation (3h)ρ = 45 + φ/2ρ = 62.0˚ for above parameters - RankineExternalEquation (3g)k a = tan² (45 - φ/2)k a = 0.333 for above parameters - RankineExternal ForcesEquation. (3e)P a = ½ γ H² k aP ah = ½ γ H² k a cos(β) - Horizontal ComponentP ah = (0.5)(120 pcf)(10')² (0.333) cos(0)P ah = 1998 lbs/lfEquation. (3f)P q = q H k aP qh = qH k a cos(β) - Horizontal ComponentP qh = (250psf)(10')(0.333) cos(0)P qh = 833 lbs/lfExternal MassesW f = W u H γ = (1.00')(10')(120 pcf) = 1200 lbs/lfW 1 = (B - W u ) H γ = (9'-1.0')(10')(120pcf) = 9600 lbs/lfW q = q (B - W u ) = (250psf)(9'-1.0') = 2000 lbs/lfE.2