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• <br />• <br /> <br />12' Thick, 11'-7" Wide, 11'-8" High, <br />#6 Rebar <br />Reinforced concrete deep-beam bending stress design for earthquake acceleration <br />Project, Pierce Adit Bulkhead, As-Built By MEL/JFA Date 3/28/08 <br />Sta.2+84 Sheet 6 of 8 <br />C = ~r~f~b,~,a = 0.85(3000)12a = 30600a <br />C = T 30600a = 60000As <br />T = Asfy = 60000As <br />a = (60000 AS)/30600 = 1.961 AS <br />M <br />Factored earthquake bending moment, M~:= n Mu = 287712 ft-lb <br />~rt <br />:= 12• Mu Muin = 3452549 in-lb <br />12• d = 140.500 in <br />Maximum concrete rebar cover, ~i,:= Lt - me <br />- -C2 - C22 - 4•C1•C3 AS = 0.411 in2 <br />'~'• 2•C~ <br />58830 As2 - 60000 Asd + Mein = 0 ~:= 58830 ,~,~„~:_ -60000• d „~:= Muin <br />Mu = Asf~(d-a/2) = 60000As(116.5 - 1.961 AS/2) = 60000 Asd - 58830 As2 <br />One cage of #6 bars (0.44 in2 per bar, 0.750-in nominal diameter,1.5021b/ft) on 12.00-in c-c <br />(11.250-in between bars) provides 0.44 in2/ft of steel area. <br />Therefore, ~A~, := 0.440 in2 <br />Check for adequacy, <br />Allowable factored bending moment, A,~,~:_ -C1•(AS2) - C2•AS Au = 3697811 in-lb <br />Design factored bending moment, <br />Au <br />Factor of safety, FS :_ <br />Muin <br />Muin = 3452549 in-lb <br />FS = 1.071 <br />