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American Tunnel bu.LKheads #2 & #3 Page 1-L January 15, 2001 <br /> Appendix A. American Tunnel Bulkhead #2 design calculations (Continued) <br /> W 7539000 7539000= <br /> V" — [2(h+0II_(144) — [2(13.5+14)110(144) — 79200 95.2 psi <br /> FS ' 110 = 1.16 <br /> i'�' �` 95.2 <br /> Plain concrete deep beam bending stress design,American Tunnel Bulkhead #2 (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#2, for 640-ft hydraulic head (277 psi pressure head): <br /> co=U= 1.4p(144) = 1.4(277)144 = 55,840 (,ft <br /> 2 5584003.52) <br /> Mn= s = 8 1,272,000 ft•lb <br /> = _ 1272000 <br /> i = <br /> 0.65 1,957 000 ft•lb <br /> — i.65 0. <br /> bL3 I(OX123) <br /> S _ I _ 122 _ 12 _ 144L2 <br /> c — L — U12) — 6 <br /> 2 2 <br /> f'Cl =3 f, = 3 3 000 = 164 psi <br /> M„c M„ 1957000 81W <br /> fc1 = 164=Q= 1 = S = 144L2 = L2 <br /> 6 <br /> L = 81640 = 497 = 22.3 ft, length required for plain concrete <br /> bulkhead. <br /> Mu Mu 1957000 1957000 <br /> as — S — 144L2 — 144(102) — 2400 — 815 psi <br /> 6 6 <br /> F8 = as = 815 = 0.20 <br /> Therefore, 10-ft long bulkhead must be reinforced. <br /> Reinforced concrete deep-beam bending stress design,American Tunnel Bulkhead #2 (ACI <br /> 318-95, Sec 9.3.2.3, Sec 9.3.2.3.: Wang& Salmon, 1985: Einarson& Abel, 1990) <br /> C= ¢rcb,, = 0.85(3000)12a= 30600a <br /> T=Asfy = 60000A, <br />