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11/13/2007 13:56 FAX <br />004/019 <br />Project, Pierce Adit Bulkhead, Sta. 3+04 By MEL/JFA Date 10/30107 <br />12' Thick, 12' Wide, 12' High, #6 Rcbar Sheet 3 of 8 <br />Bulkhead thickness (length) to resist concrete shear from static fluid. load on upstream face: <br />Factored static fluid load on bulkhead face. FS 144• (?1.s,p•hb•wb F, = 1509581 lb <br />Factored static fluid load/sq ft of face, wfs Fs wf, = 10483 psf <br />hb' wb <br />Concrete shear strength, I: 2 i? fcs = 109.5 psi <br />Bulkhead thickness to resist factored shear load, Ls := FS LS = 1.99 ft <br />2. 111, + wb) • 1 44-f,, <br />Plain concrete deep-beam bending stress design for static fluid load on-upstream face: <br />Deep-beans defined as Wb/Lt < 4 (ACI 318-02, Sec 10-7), <br />wb <br />= 1.0 which is less than 4. 1'berefore, this is a deep beam for design. <br />Lt <br />Factored static fluid load on bulkhead face,, := 144.Ofs'P'hb-Wb FS = 1509581 lb <br />FS <br />Uniform factored static fluid load on bulkhead, f, fs = 10483 psf <br />hb- wb <br />2 <br />Nominal static fluid bending moment, Mn I's' W b 8 M„ = 188698 ft-lb <br />Factored static fluid bending moment, Mu M <br />n M„ = 343087 ft-lb <br />144•Lt2 <br />Bulkhead section modulus, ?5,:= 6 S = 3456 i.nl <br />Concrete flexural (tensile) design stress, fc1 := 3 f? fc1 = 16' 4. 3 psi <br />Mu Mu M <br />US := S 144.1_12 ZA• 24 . Lt <br />2 <br />6 <br />g-s'fc I Lst Lst = 9.33 I't <br />V 24 as