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<br />u <br />Project, Pierce Adit Bulkhead, Sta. 3+04 By MEL/JFA Date 10/30/07 <br />12' 'hick, 12' Wide, 12' Hizh, #6 Rebar <br />Sheet 4 of 8 <br />Reinforced concrete deep-beam bending stress design for static fluid load on upstream face <br />C = ?J bwa = 0.85(3000)12a = 30600a T = Ayfy = 60000AS <br />C=T 30600a = 60000A?, a = (60000 A,)/30600 = 1.961 AS <br />Factored static fluid bending moment, Mn <br />Mu = 209664 ft-lb <br />(t)rc <br />Muin = 12-Mu Kin = 2515968 in-lb <br />Maximum concrete rebar cover, d := 12. Lt - mc d = 140.500 in <br />M„ = ASf,(d-a/2) = 60000A.,(116.5 - 1.961 A,/2) = 60000 A,d - 58830 A\2 <br />58830 AS2 - 60000 ASd + Muin = 0 Ci := 58830 C2 :_ •..60000 d C3 Muin <br />-C2 - JC22 - 4-C1 'C3 <br />As := 2-C A3 = 0.299 in2 <br />i <br />One cage of 96 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, A0.44 in'- <br />Check for adequacy, <br />Allowable factored bending moment, Au :_ -Cj -(AS`) - C2 As A, = 3697811 in-lb <br />Design factored bending moment, Muin = 2515968 in-lb <br />Au <br />Factor of safety, J=S <br />PS = 1.470 <br />Muin