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Gold Prince Tunnel Bulkhead Calcs Page 4 August 18, 1996 <br /> Gold Prince Tunnel bulkhead, for 65 ft pressure head to push water to ground surface <br /> (o =U= 1.4p(144) = 1.4(28.2)144= 5,685 (Lb)ft <br /> ft <br /> w12 _ 5685(8.52) = 51,300 ft-lb <br /> ••� 8 8 <br /> _ Mn —_ 51300 =78,900 ft-lb <br /> 0.65 0.65 <br /> bL3 1(L3)(123) <br /> S _ I — lz _ lz — 144L3 <br /> c— �— L(12 — 6 <br /> 2 2 <br /> fc1 = 3 fT = 3 3000 = 104psi <br /> / Muc _ M„ 78900 _ 3290 <br /> fC1 = 164 =a= I— $ _ 144L2 — L2 <br /> 6 <br /> I' 3i 6 40 = 2 0.1 =4.5 ft Therefore, 5-ft long bulkhead needs no <br /> reinforcement. <br /> _ Mu _ Mu — 78900 = 78900 — <br /> 6 $ 144L2 144(52) 600 — 132 psi <br /> 6 <br /> 6 <br /> FS= 164 = 1.25 <br /> 32 <br /> Critical section shear strength for Prince Mine Tunnel, 5-ft deep beam bulkhead) <br /> Deep beam defined as d < 5 (ACI 318-89, Sec 11.8.1). Critical section shear at 0.151 (1.28 <br /> ft)from ribside(ACI 318-89, Sec 11.8.5), with reinforcing bars, there will be no reinforcing <br /> steel in the beam. <br /> Detailed shear strength at critical section(ACI 318-89, Sec 11.8.7) <br /> Gold Prince Tunnel bulkhead, for 20 ft pressure head to push water into Sunnyside Nfine <br /> 1 = 8.5(12) __ 102 = 1.70 < 5 Therefore, plain concrete bulkhead is a deep beam for design! <br /> d [5(12)1 60 <br /> Ve =K(1.9 f, +2500pw ud)bwd <br /> MI_ (21)(0.151)—w(0.151)0-2 1 =0.06375 22 =0.06375[181428.52)1 _4178 ft-lb <br /> M. _ Mn __ 4178 =4642 ft.lb <br /> 0.9 0.9 <br /> 4 <br />