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Gold Prince Tunnel Bulkhead Calcs Page 7 August 18, 1996 <br /> Mua= M0.9n = t709s00.9 = 1%940 ft-lb (239,300 in-lb) <br /> Thickness of plain concrete bulkhead required to support earthquake produced bending <br /> moment(Mua)of 19,940 ft-lb: <br /> fc1 = 3 fc = 3 3000 = 164psi <br /> / M„ac — Mua — 19940 —_ 831 <br /> f cl = 164 =a= I s 144L2 L2 <br /> 6 <br /> L— 164 — 5.1 =2.25 ft Therefore, 5-ft long bulkhead needs no <br /> reinforcement to support maximum credible earthquake acceleration. <br /> 6— Mua — Mua = 19940 — 19940 _ 33 psi 14 s 4L2 144(52) 600 <br /> 6 <br /> 6 <br /> FS= f61 = s 64 =4.97 <br /> Gold Prince Tunnel bulkhead, for 65 ft pressure head to push water to ground surface <br /> P= HY„ = 65(62.4) =28.2 psi <br /> 144 144 <br /> F=pbh,(12) =28.2(12)12=4061 fb <br /> Ua = 1.05F+ 1.40E= 1.05(4061) + 1.40(447)=4264+ 626=4890 b <br /> ft <br /> Earthquake nominal beam bending moment <br /> Mna — U 8 2 = 4890(88.52) —44,160 ft-lb <br /> Mua = M" = 44110 =49,070 ft-lb (588,800 in-lb) <br /> 0.9 0.9 <br /> Thickness of plain concrete bulkhead required to support earthquake produced bending <br /> moment(Mua) of 49,070 ft•lb: <br /> fC1 = 3 fC = 3 30 00 = 164psi <br /> Muac — M. = 49070 — 2045 <br /> fC1 = 164 =Q— I — s 194L2 - L2 <br /> 6 <br /> 7 <br />