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Larry Perino Page 12 August 17, 2000 <br /> EEn, = E,,,a = 1,125,000(0.087) = 97,900 lb <br /> E_ �.E. - 97900 h 13 8= .753016- <br /> Total load under earthquake acceleration <br /> Terry Tunnel bulkhead, for 469-ft hydraulic head: <br /> _ HyW _ 469(62.4) =203 Sl <br /> p- 144 - 144 p <br /> F =pb,,(12) =203(12)12 = 29,200 ft <br /> Ua = 1.05F + 1.40E= 1.05(29200) + 1.40(7530) = 30,660 + 10,540 <br /> Ua =41,200 ft <br /> Earthquake nominal beam bending moment <br /> U.12 41200(12.72) =Mama — s s <br /> 831 000 ft lb <br /> = <br /> o9 — 830900 <br /> MUa = = 923,000 ft•lb (11,080,000 in-lb) <br /> - - <br /> Steel area required for earthquake loading: <br /> 58800A2 - 4,830,000As + 11,080,000 = 0 <br /> AS = 2.362 8 Steel area required to resist maximum credible earthquake loading for <br /> 7-ft thick bulkhead. <br /> #10 bars on 6-in c-c provide 2.540 ll steel area <br /> Check for adequacy <br /> Allowable M„,, =—58,800A2 +4,830,OOOAs = 11,890,000 in•lb <br /> Design M„a = 11,080,OOOin•lb <br /> FS = "'9'000 = 1.07 for earthquake loading of 7-ft thick bulkhead <br />