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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 base of blocks, a check is made at the foundation level with the <br /> answer only shown. <br /> The vertical resisting forces is W1 +W1 + Pay+ Paev SumVs= 7,790 <br /> Resisting force= SumVs*tan(phi)+ intercept x L FRe=5,229 ppf <br /> Driving force= Pa_h + Pae_h + Pif <br /> =2,760+750+422 FDr=3,933 ppf <br /> FOS= FRe/FDr[leveling pad/foundation] FoS =5.71 / 1.65 <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+ MPaev SumMrS=24,060 ft ppf <br /> Driving Moment= MPav+ MPaeh +MPif SumMoS = 16706.47 ft ppf <br /> Factor of Safety= SumMrS/SumMoS FoS = 1.44 <br /> SEISMIC BEARING <br /> Bearing is the ability of the foundation to support the mass of the structure. <br /> Qult= c*Nc+q*Nq + 0.5*gamma*(B1)*Ng <br /> where: <br /> Nc=42.16 <br /> Nq =29.44 <br /> Ng =41.06 <br /> c= 0.00 psf <br /> q =287.50 psf <br /> Calculate Ultimate Bearing, Qult(seismic) Qult= 18468.64 psf <br /> eccentricity(e) e=1.514 <br /> Equivalent Footing Width, B' = L-2e+ Ivl pad B' =2 ft <br /> Bearing Pressure =sumVs/B'+2B'+ LP depth)/2 * LP depth sigma=2,059 psf <br /> Factor of Safety for Bearing = Quit/Bearing FoS =9 <br /> 2//. <br /> UltraWall 5.0.18138 Page)3— <br />