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Project Design Mogul Tunnel Bulkhead <br />10.6' x 9.5' (9' Thick. Station 2+41) <br />By JFA Date 8/21/03 <br />Sheet 3 of 6 <br />Bulkhead thickness (length) to resist concrete shear from static fluid load on face: <br />Factored static fluid load on bulkhead face, F s := 144-~ fs-p•h•t F s = 1917779 Ib <br />F <br />Factored static fluid load/sq ft of face, ~ fs '= h-1 ~' fs = 19044 psf <br />Concrete shear strength, f cs '= 2• f c f cs = 109.5 psi <br />Fs <br />Bulkhead thickness to resist factored static fluid load, L s :_ <br />2•(h+l)-144-fcs Ls=3 ft <br />Plain concrete deep-beam bending stress design for earthquake acceleration: <br />Earthquake static fluid load per foot of tunnel height,E fe ~_ ~ fe'F s E fe ° 2013668 Ib <br />~ e8'S IS•y K,•h•1•oc <br />Factored fluid mass accelerated by earthquake, E ~, := E ~, = 347312 lb <br />B <br />L h•1- a <br />Bulkhead mass accelerated by earthquake); bm := ea' t' Y °• E bm = 17890 lb <br />B <br />Factored required strength for bulkhead accelerated by earthquake, U ~ := E fe + E ~ + E bm <br />U ~ = 2378870 lb <br />U <br />Factored uniform earthquake load on bulkhead face, u :_ a u = 23623 psf <br />h~l <br />z <br />Nominal earthquake bending moment, M ~ :_ °gl M ~ = 331790 ft-Ib <br />M <br />Factored earthquake bending moment, M n :_ ° M a = 510446 ft-Ib <br />~ pc <br />Bulkhead section modulus, S ;= 144•LZ <br />6 <br />Concrete flexural (tensile) design strength, t cl := 3 • f c f cl = 164.3 psi <br />Mu M~ Mu <br />a s. S a s. 144-LZ v s. 24'LZ <br />6 • <br />M <br />°s'=fc1 L;= ° L=11.4 ft <br />24•a s <br />M~Bkdlgmed NiUi903 4.h AM <br />