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project Design Koehler Tunnel Bulkhead By JFA Date 7/21103 <br />8.5' x 9' 112' Thick Station 3+02) <br />Sheet 6 of 8 <br />Critical section shear strength for 12-ft thick reinforced concrete deeo-beam bendine <br />stress design for earthquake acceleration: (Continued) <br />Ratio of tensile reinforcing steel (p µ,): <br />AS <br />p µ, := p µ, = 0.0006459 for one two-way row of #10 bars, 12-in c-c <br />b µ,•12•d <br />Allowable concrete shear strength (V ~) at critical section: <br />Vu:=K•(1.9• fc+2500•pµ.•Mu•12)•12•bµ,•d Vc=547643 lb <br />tt u <br />Limiting allowable value for term V ~ cannot exceed V <br />mex <br />V~:= (6• fc~•b,N•12•d Vm~=554076 Ib <br />Use lower of V 1f18,~ or V ~ to calculate factor of safety for factored critical section shear stress V „ <br />V <br />FS := -° FS = 2.16 <br />Vu <br />ruerer.mca ~mnsm ~m ern <br />