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Larry Perino Page 9 August 17, 2000 <br /> Appendix A. Terry Tunnel near portal bulkhead design calculations (Continued) <br /> = Mn - 824600 = 1,269 000 ft•lb <br /> 0.65 - 0.65 <br /> 0 1(OX123) <br /> S __ I _ i2 _ 12 _ 144L2 <br /> c — L — U12) — 6 <br /> 2 2 <br /> flee =3 f� = 3 3 000 = 164 psi <br /> Muc Mu 1269000 52900 <br /> f1ci = 164 =6= i = s = I"L2 = L2 <br /> 6 <br /> L = 51640 — 271 = 18.0 ft, length required for plain concrete <br /> bulkhead. <br /> Mu Mu 1269000 1269000 <br /> as — S — 144L2 — 144(72) — 1176 = 1, 079 psi <br /> 6 6 <br /> FS = os - 1079 164 = 0.15 <br /> Therefore, 7-ft long bulkhead must be reinforced. <br /> Reinforced concrete deep-beam bending stress design, Terry Tunnel bulkhead (ACI 318-95, Sec <br /> 9.3.2.3, Sec 9.3.2.3.: Wang& Salmon, 1985: Einarson& Abel, 1990) <br /> C=�f'cb, = 0.85(3000)12a= 30600a <br /> T = Asfy = 60000AS <br /> 60000A5 <br /> C = T; 30600a= 60000AS; a= 30600 1.961Ar, <br /> co=U= 1.4p(144) = 1.4(203)144 =40,900(ft <br /> = g2 = ao9oo(12.72) = 825,000 ft•lb <br /> h4„ = 09 = 820.9 = 917,000 ft•lb (11,000,000 in-lb) <br /> M„=Asfy(d-2); d =L - m, = 7(12) - 3.5 = 80.5in <br /> M„= 60000A,(d—2) = 60000A,(80.5— 1.911A.l _4830000As—58800As <br /> Therefore: 11,000,000 =4,830,000A6- 58,800A, <br /> 58,800As- 4,830,000AS + 11,000,000 = 0 <br />