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American Tunnel bulkheads #2 & #3 Page ly January 15, 2001 <br /> Appendix B. American Tunnel Bulkhead #3 design calculations (Continued) <br /> _ W 9683000 9683000 <br /> Vs — [2(HOI- 144) — [2(15+12)]11(144) — 85540 = 101.5 psi <br /> _ = 101.5 = 1.08 <br /> Plain concrete deep beam bending stress design,American Tunnel Bulkhead #3 (ACI 318-95, <br /> Sec 9.9.2.5, 18.4.1(b), & ACI 318-71, Sec 9.2.1.5) <br /> American Tunnel Bulkhead #3, for 773-ft hydraulic head (335 psi pressure head): <br /> co=U= 1.4p(144) = 1.4(335)144 = 67,540 (a <br /> _ 82 _ 67548(122) = 1,216,000 ft•lb <br /> = — 1216 = 1,871,000 ft•lb <br /> —0.65 0.65 <br /> b1.3 I(OX123) <br /> I _ 12 _ 12 _ 144L2 <br /> S o — L — L02) — 6 <br /> 2 2 <br /> �CI =3 f� = 3 3000 = 164 psi <br /> �/ Muc Mu 1871000 — 77960 <br /> 11cI = 164 =U= 1 = S = 144L2 — L2 <br /> 6 <br /> L= 7i6a° = 4-75 = 21.8 ft, length required for plain concrete bulkhead. <br /> _ M„ _ Mu __ 1871000 1871000 _ 645 psi <br /> Qg S 144L2 144012) 2900 <br /> 6 6 <br /> FS = s = Gas =0.25 <br /> Therefore, 11-ft long bulkhead must be reinforced. <br /> Reinforced concrete deep-beam bending stress design, American Tunnel Bulkhead #3 (ACI <br /> 318-95, Sec 9.3.2.3, Sec 9.3.2.3.: Wang& Salmon, 1985: Einarson& Abel, 1990) <br /> C= �fcbw = 0.85(3000)12a= 30600a <br /> T= Asfy =60000As <br />