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Project, Pierce Adit Bulkhead, Sta. 3+04 <br />By iMIEI!,/JFA Date 10J30/07 <br />12' Thick, 12' Wide 12' High, 96 Rebar_ Sheet 6 of 8 <br />Reinforced concrete deep-beam bending stress design for earth uake acceleration <br />C = ?rj b,,,,a = 0.85(3000)12a = ; 0600a T = A,fy = 60000As <br />C=T 30600a= 60000AS a = (60000 A;)/30600 = 1.961 As <br />Factored earthquake bending moment, Mn <br />Mu = 279201 ft-lb <br />12•M,? Muin = 3350407 in-lb <br />Maximum concrete rebar cover, 1:= 12-Iq - m, d = 140.500 in <br />r <br />MI, = A.,fc(d-a/2) = 60000A,(116.5 - 1.961 AY/2) = 60000 A.%d - 58831) Art ! <br />58830 As2 - 60000 Asd + Muin = 0 58830 C 21 := ...60000•d ,?L:= Muin <br />-C2 - C22 - 4 C i C3 <br />2 Cl AS = 0.399 in2 <br />One cage of 46 bars (0.44 in2 per bar, 0.750-in nominal diameter., 1.502 lb/ft) on 12.00-in c-c <br />(11.250-in between bars) provides 0.44 in2/ft of steel area, <br />Therefore, <br />1451:= 0.440 in' <br />Check for adequacy, <br />Allowable factored bending moment, 4;U';= -Ci.(As') - C,,A, Au = 3697811 in-lb <br />Design factored bending moment, Muin = 3350407 in-lb <br />Factor of safety, A, FS = 1.104 <br />Muin