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Project, Steve Adit Bulkhead, As-Built gy MEL/JFA Date 3/28/08 <br />Sta.2+65 Sheet 6 of 8 <br />10' Thick, 7'-7" Wide, 8'-2" High, <br />#6 Rebar <br />Reinforced concrete deep-beam bending stress design for earthquake acceleration <br />• <br />C = ~r~f~b,~,a = 0.85(3000)12a = 30600a <br />C=T <br />30600a = 60000AS <br />Factored earthquake bending moment, <br />T = Asfy = 60000AS <br />a = (60000 AS)/30600 = 1.961 AS <br />Mn <br />1,:= art Mu = 113726 ft-lb <br />M„ayyy~:= 12•Mu Mu;n = 1364714 in-lb <br />Maximum concrete rebar cover, ~,:= 12•I~ - me d = 116.500 in <br />Mu = Asf~(d-a/2) = 60000AS(116.5 - 1.961 AS/2) = 60000 Asd - 58830 AS2 <br />58830 AS2 - 60000 Asd +Muin = 0 <br />-C2 - ~ C22 - 4'Ct'C3 <br />,~s,~• 2•C1 <br />~:= 58830 ,~:_ -60000•d ~:= Muin <br />AS = 0.196 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, ~:= 0.44 in2 <br />Check for adequacy, <br />Allowable factored bending moment, :_ -C1•(AS2) - C2•AS Au = 3064211 in-lb <br />Design factored bending moment, Mu;n = 1364714 in-lb <br />L~ <br />A <br />Factor of safety, FS := u FS = 2.245 <br />Muin <br />