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Steve Adit Bulkhead, As-Built <br />Project, Sta.2+65 By MEL/JFA Date 3/28/08 <br />10' Thick, 7'-7" Wide, 8'-2" High, Sheet 4 of 8 <br />#6 Rebar <br />Reinforced concrete deep-beam bending stress design for static fluid load on upstream face <br />C = ~r~f~b,,,a = 0.85(3000)12a = 30600a <br />C=T <br />30600a = 60000AS <br />Factored static fluid bending moment, <br />T = Asfy = 60000AS <br />a = (60000 AS)/30600 = 1.961 AS <br />M„ <br />~rc MU = 83877 ft-lb <br />Mu;n := 12•Mu Mu;n = 1006529 in-lb <br />Maximum concrete rebar cover, d := 12•I,t - me d = 116.500 in <br />M„ = Asf~(d-a/2) = 60000AS(116.5 - 1.961 AS/2) = 60000 Asd - 58830 AS2 <br /> <br />58830 AS2 - 60000 Asd + MU;n = 0 <br />-C2 - C22 - 4•Ci•C3 <br />AS •_ <br />2•C1 <br />C1 := 58830 C2 :_ -60000•d C3 := M,,;n <br />AS = 0.144 in2 <br />One cage of #6 bars (0.44 in2 per bar, 0.750-in nominal diameter, 1.502 lb/ft) on 12.00-in c-c <br />(11.25-in between bars) provides 0.44 in2/ft of steel area. <br />Therefore, A~,:= 0.44 in2 <br />Check for adequacy, <br />Allowable factored bending moment, A„ :_ -C1 •(AS2) - C2•AS A„ = 3064211 in-lb <br />Design factored bending moment, Mu;,, = 1006529 in-lb <br />Au <br />• Factor of safety, FS := FS = 3.044 <br />Muin <br />