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Ransom Tunnel Bulkhead Page 8 May 7, 1997 <br /> U. =42,000 ft <br /> Earthquake nominal beam bending moment <br /> u 525 aZ000(l02) = 000 ft•lb <br /> Mra g= = g , <br /> Mn 121000 Mua - 0.9 0.9 = 583>300 ft-lb (7>000>000 in-lb) <br /> - <br /> Steel area required for earthquake loading: <br /> 58800A2 - 5,550,000A6+ 7,000,000 = 0 <br /> A,= 1.28 s Steel area required to resist maximum credible <br /> earthquake loading. <br /> #10 bars on 8-in c-c provide 1.905 ''ft steel area <br /> Check for adequacy <br /> Allowable Mu,,, = —58,800A' +5,550,OOOA, = 10,360,000 in•lb <br /> Design M„Q = 7,000,OOOin•lb <br /> 10360000 <br /> FS = 7000000 1.48 against earthquake loading. <br /> John F. Abel, Jr. <br /> Colorado P.E. 5642 <br /> 8 <br />