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Computation of Cast in Place Concrete Footing <br />12000 1200 <br />4000 400 <br />3000 200 <br />1750 175 <br />1807.3.2.1 Nonconstrained Case <br />Where: <br />b = 3 <br />9.20 <br />h = 18.4 <br />P = 4022.79729 <br />S1 =1073 <br />Then: Minimum Vertical Reinforcing Steel: <br />A = 2.92 As min = 5.09 in2 <br />and: # bar = 8 <br />d =9.26 ft Qty = 12 <br />Axial Loading Check: <br />7.1 ft2 <br />65.4 ft3 <br />9487.6 lbs <br />1178.0 lbs <br />Total vertical Load = 10665.6 lbs <br />291.7 psf AFR=Allowable Frictional Resistance Section 1810.3.3.1.4 (max 500 psf) <br />19947.8 lbs <br />-9282.2 lbs <br />-1313.2 psf <br />Pier Weight + Friction 14717.7 lbs <br />0.0 lbs <br />-14717.7 lbs <br />Per Geotechnical report, top two feet must be ignored. <br />3.0 11.50 ft. Deep <br />From Geotechnical report <br />DRILLED PIER FOOTING DESIGN <br />Table 1806.2 <br />ft. Diameter and a minumum of Use a footing with <br />OK is less than allowable <br />Volume of Footing = <br />Weight = <br />OK is less than allowable <br />Axial Load = <br />AFR= <br />Friction Resistance= <br />Actual Load= <br />Actual Pressure = <br />USING SAFETY FACTOR OF 2.0 <br />Uplift <br />Actual Lift Force = <br />distance in feet from ground surface to point of application of "P" <br />applied lateral force in pounds - load from node 1 of RFEM analysis <br />allowable lateral soil-bearing pressure as set forth in Table 1806.2 based on a depth of one third <br />the depth of embedment <br />Area of footing = <br />depth of embedment in earth in feet but not over 12 ft for purpose of computing lateral pressure <br />(change until it matches formula obtained value) <br />Class of Materials <br />2000 <br />1500 <br />150 <br />diameter of round post or footing or diagonal dimension of square post or footing, feet <br />The following formula may be used in determining the depth of embedment required to resist <br />lateral loads where no constraint is provided at the ground surface such as rigid floor or rigid <br />ground surface pavement. <br />1. Massive crystalline bedrock <br />Allowable <br />Foundation <br />Pressure (psf)2 <br />Lateral <br />Bearing <br />lbs/ft2/ft <br />Type of soil to use: <br />100 <br />4. Sand, silty sand, clayey sand, silty gravel and clayey gravel (SW, <br />SP, SM, SC, GM and GC) <br />5. Clay, sandy clay, silty clay, and clayey silt (CL, ML, MH, and CH) <br />3. Sandy gravel and/or gravel (GW and GP) <br />2. Sedimentary and foliated rock