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U TR BLOCK, INC. <br />ECCENTRICITY AND BEARING <br />Eccentricity is the calculation of the distance of the resultant away from the centroid of mass. In wall design <br />the eccentricity is used to calculate an effective footing width. <br />Calculation of Eccentricity <br />SumV = (W1 + W2 + ILL + Pa_v + Pq_v) <br />e = L/2 - (SumMr + M_LL - SumMo)/(SumV + ILL) <br />e=4.92/2 - (9761 /5640.00) e =0.728 ft <br />Calculation of Bearing Pressures <br />Quit =c*Nc+q*Nq+0.5"y*(B')"Ng <br />where: <br />Nc =50.59 <br />Nq =37.75 <br />Ng =56.31 <br />c =0.00 psf <br />q = 195.00 psf <br />B'= B - 2e + lvlpad = 3.96 ft <br />Gamma(LP) =130 pcf <br />Calculate Ultimate Bearing, Quit Quit =21860 psf <br />Bearing Pressure = (SumVert / B') + ((2B + LP depth)/2 ` LP depth ` gamma) sigma=1484.71 psf <br />Calculated Factors of Safety for Bearing Quit/sigma =14.72 <br />UltraWall 4.0.16287.0 Page 10 <br />