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Project Design Mogul Tunnel Bulkhead By JFA Date 7!4/03 <br />8' x 8' (9' Thick, Station 2+411 <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~I F s = 1218841 Ib <br />F <br />Factored static fluid load/sq ft of face, ~ fs ~= s c' fs = 19044 psf <br />h ~1 <br />Concrete shear strength, fcs := 2~ fc fcs = 109.5 psi <br />Fs <br />Bulkhead thickness to resist factored static fluid load, L •- <br />s 2~(h+l)~144~fcs Ls=2.4 ft <br />Plain concrete deep-beam bending stress design for earthquake acceleration: <br />Earthquake static fluid load per foot of tunnel height,E to ~_ ~ fe•F s E fe = 1279789 lb <br />Factored fluid mass accelerated by earthquake, E ~ :_ ~ ~ S ls•y w'h•t•a E ~ = 220734 Ib <br />B <br />~ •L •h•1•y a <br />Bulkhead mass accelerated by earthquakes bm := ea t c• E bm ° 11370 Ib <br />B <br />Factored required strength for bulkhead accelerated by earthquake, U ~ := E fe + E ~ + E bm <br />U a = 1511894 Ib <br />U <br />Factored uniform earthquake load on bulkhead face, u :_ °` u = 23623 psf <br />h~l <br />z <br />Nominal earthquake bending moment, M n :_ uRl M n = 188987 ft-Ib <br />hi <br />Factored earthquake bending moment, M u :_ ° M u = 290749 ft-Ib <br />~~ <br />Bulkhead section modulus, S ;= 144 Lz <br />6 <br />Concrete flexural (tensile) design strength, fcl := 3• fc fcl = 164.3 psi <br />Mu Mu Mu <br />s = S s = <br />a a 144~Lz a s• 24•Lz <br />6 <br />M <br />6s~'=fcl L;= u L=8.6 ft <br />24•o s <br />- ,ti45.y, is <br />,- ,~,~ ~ ~ a`~~~a~~nyyismiruret <br />