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ECCENTRICITY AND BEARING <br />Eccentricity is the calculation of the distance of the resultant away from the centroid of mass. In wall <br />ReinDesign the eccentricity is used to calculate an effective footing width, or in rigid structure, it is used to calculate <br />the pressure distribution below the base. <br />Calculation of Eccentricity <br />e = (SumMr + M7 + SumMo)/SumV <br />Mr =-5,337.06 <br />Mo = 5,117.09 <br />e = (-5,337.065,117.09) /6,192.59) <br />e=-0.953 <br />Because 'e' is negative (leaning into the embankment), it is ignored to get the maximum bearing at the face <br />of the wall. <br />Calculation of Bearing Pressures <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=125.00 psf <br />B' =7.91 ft <br />Calculate Ultimate Bearing, Quit Quit=19,842.05 psf <br />Applied Bearing Pressures = (SumVert / B' + (213 + LP depth)/2 * LP depth *gamma) <br />sigma=1,032.10 psf <br />Calculated Factors of Safety for Bearing Quit/sigma =19.22 <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 10 <br />