Evo Design - structural design Calculation No. 001-FOUNDATION INTERACTIVE ONLINE CALCULATION SHEET Project No. onlinestructuraldesign.com SAMPLE CALCULATION Project Title: Foundation calculation - interactive design spreadsheet Calc. By Date Rev. MN 16.04.2014 0 Subject/Feature: Foundation design; Foundation maximum soil pressure calculation Checked By Date Imperial Units spreadsheet CN 16.04.2014 InputÂ Output Working loads Eccentricity Footing dimensions Max. pressure on soil under foundation Pier dimensions Materials (soil, concrete) Maximum Factored Loads N = kip axial force Pair of maximum loads. Mx and My are not M = kip-ft bending moment considered simultaneous. F = kip horizontal force on top of foundation (shear) Footing Dimensions L = ft Foundation base length W = ft Foundation base width t = 1.5 ft Foundation base thickness (parameters that can not be modified in the demo version) f = ft Depth to top of foundation base Pier Dimensions l = ft pier dimension along X w = ft pier dimension along Z h = ft pier height Materials gfill = pcf (unit weight of fill material) gconcrete = pcf (unit weight of concrete) General Calculations Af = L * W = ft2 Foundation Area Ap = l * w = ft2 Pier Area Wtc = (Af*t + Ap*h)*gconcrete = kips Concrete Weight Wts = (Af - Ap)*gconcrete*f = kips Fill Material Weight Loads transfered to the ground (for the calculation of soil max. pressure) Nbase = Wtc + Wts + N Â = kips Mbase = F * (t + h) + M = kip-ft e = Mbase / Nbase Â = ftÂ Â  eccentricity L/6 = ft L/2 = ft e kip-ft kip Foundation Base References: