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Ransom Tunnel Bulkhead Page 7 May 7, 1997 <br /> V, =K(1.9 f, +2500p,v Ivtd)bwd <br /> K= 3.5 - 2.5M° — 3.5 - 2.51 196300 1 = 3.5 - 0.28 = 3.22 <br /> vud — L 228000(9") J <br /> K cannot exceed 2.5 Therefore K=2.5 <br /> _ A, __ 1.9os = 0.00 17160613 Trial, 410 bars on 8-in centers, two-way <br /> p" bwd (12)92.5 <br /> Vc=K(1.9 f', +2500pw Md)bwd <br /> 228100(92s) <br /> Ve=2.5 1.9 3000 +2500(0.001716) 1962002 12(92.5) <br /> Ve =2.5[104.1 + 38.45]1110 =2.5[142.55]1110 = 395,500 lb <br /> Allowable Vc <(6 f. >wd<(6 3000 )12(92.5 =364,800)lb (ACI 318-95, Sec l l.8.7) <br /> Therefore FS = j° = 364800 = 1.60 <br /> vu 228100 <br /> Earthquake bulkhead design; Load factors (ACI 318-95, Sec 9.2.2, 9.2.3, 9.2.5) Factor for fluid load <br /> under earthquake acceleration (F) = 1.05; Load factor for earthquake accelerated mass (E) _ <br /> 1.40. Maximum credible earthquake acceleration (a) is 0.087 �2 . <br /> U= 1.05F + 1.40E <br /> Mass(E) accelerated by maximum credible earthquake <br /> Em_ S17wh1+1,Wyc _ [230(62.4)10(10)}8(10)10(151)] _48,300 1b�2 <br /> S — —32.2 ft <br /> E Em =Ema=48,300(0.087) =4204 lb <br /> E= E Em _ 4204 =420 <br /> h — 13 ft <br /> Total load under earthquake acceleration <br /> Ransom Tunnel bulkhead, for 635-ft hydraulic head: <br /> _ Hyw _ 635(62.4) = 275 SI <br /> P— 144 — 144 1� <br /> F =pbw(12)= 275(12)12 = 39,600 a <br /> U. = 1.05F + 1.40E= 1.05(39600) + 1.40(420) =41,580 +422 <br /> 7 <br />