Laserfiche WebLink
f I <br />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=2.46/2 - (1662 /2115.19) e =0.443 ft <br />Calculation of Bearing Pressures <br />Qult=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+Ivlpad=2.07ft <br />Gamma(LP) =130 pcf <br />Calculate Ultimate Bearing, Qult Qult =14944 psf <br />Bearing Pressure = (SumVert / B') + ((2B + LP depth)/2 * LP depth * gamma) sigma=1078.28 psf <br />Calculated Factors of Safety for Bearing Qult/sigma =13.86 <br />UltraWall 4.0.16287.0 Page 10 <br />