Laserfiche WebLink
CORNERBiLiNE <br />•j <br />SEISMIC SLIDING <br />The target factor of safety for seismic is 75% of the static value. Live loads are ignored in the analyses <br />based on the basic premise that the probability of the maximum acceleration occuring at the exact same instant as <br />the maximum live load is small. <br />Details are only shown for sliding at the critical interface, sliding in the foundation or sliding in the reinforced <br />fill zone <br />The vertical resisting forces is Sum(W) - W7 + Pav + Paev + Pgdv SumVs = 5,246.34 <br />Resisting force = SumVs*tan(phi) + intercept* Wu FRe=3,278.27 ppf <br />Driving force = Pa_h + Pae_h/2 + Pgd_h + (Pif + Pir) <br />=662.31 +103.24 +0.00 +345.71 FDr=1,111.27 ppf <br />FOS = FRe/FDr FoS =2.95 <br />SEISMIC OVERTURNING <br />Overturning is rotation about the front toe of the wall. Eccentricity is also a check on overturning <br />Resisting Moment = M1 + M2 + MPav + MPgdv + MPaev/2 SumMrS=17,154.92 ft ppf <br />Driving Moment = MPav +MPadh + MPaeh +MPif SumMoS=3,100.86 ft ppf <br />Factor of Safety = SumMrS/SumMoS FoS =5.53 <br />SEISMIC BEARING <br />Bearing is the ability of the foundation to support the mass of the structure. <br />Quit = c*Nc + q*Nq + 0.5*gamma*(B')*Ng <br />where: <br />Nc =42.16 <br />Nq =29.44 <br />Ng =41.06 <br />c =0.00 psf <br />q=195.00 psf <br />Calculate Ultimate Bearing, Quit (seismic) Quit=19,842.05 psf <br />Equivalent Footing Width, B' = L - 2e + Ivl pad B' =10.61 ft <br />Bearing Pressure = sumVs/B' + (213 + LP depth)/2 * LP depth * gamma sigma=865.43 psf <br />Factor of Safety for Bearing = Quit/Bearing FoS =22.93 <br />Note: Calculations and quantities are for PRELIMINARY ANALYTICAL USE ONLY and MUST NOT be used for final <br />n or construction without the independent review, verification, and approval by a qualified professional engineer. <br />CornerStone Analysis and Design 5.0.19309 CS/-/Y) <br />