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Project Design Mogul Tunnel Bulkhead <br />8' x 8` (9' Thick, Station 2+41) <br />By JFA Date 7/4!03 <br />Sheet 6 of 6 <br />Critical section shear strength for 9-ft thick reinforced concrete deep-beam bending <br />stress design for earthquake acceleration; (Continued) <br />Ratio of tensile reinforcing steel (p w): <br />As <br />p w := p w, = 0.0003509 for one two-way row of #6 bars, 12-in c-c <br />b µ,• 12-d <br />Allowable concrete shear strength (V ~) at critical section: <br />V c := K• 1.9• fc + 2500 p µ,- V a . d 12b K,•d V c = 361054 lb <br />M~ 12 <br />Limiting allowable value for term V ~ cannot exceed V <br />mxa <br />Vm~:=(6• fc)-bµ,•12d Vm~=412106 lb <br />Use lower of V m»x or V ~ to calculate factor of safety for factored critical section shear stress V „ <br />V <br />FS :_ ~ FS = 4.64 <br />Vu <br />M¢1Btdlamed LIYI903 n24 PM <br />