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Project Design Mogul Tunnel Bulkhead fly JFA Date 8/21/03 <br />10.6' x 9.5' (9' Thick. Station 2+411 <br />Sheet 6 of 6 <br />Critical section shear strength for 9-ft thick reinforced concrete deea-beam bendine <br />stress design for earthquake acceleration: (Continued) <br />Ratio of tensile reinforcing steel (p W): <br />As <br />p w := p w = 0.00063 for one two-way row of #6 bars, 12-in c-c <br />b N,-12•d <br />Allowable concrete shear strength (V ~) at critical section: <br />Vc:=K•~1.9- fct2500•pN,-Va•d~•12•bµ,•d Vc=373411 Ib <br />M ~ 12 <br />Limiting allowable value for term V ~ cannot exceed V <br />max <br />V max ~_ (6- fc)•b N,•12-d V max = 412106 Ib <br />Use lower of V max or V ~ to calculate factor of safety for factored critical section shear stress V „ <br />V <br />FS :_ ~ FS = 3.62 <br />Vu <br />-~nic~avttn~aiva~va <br />