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<br /> <br />Project As Built Koehler Tunnel Bulkhead BY JFA Date 9/6/03 <br />8.42' x 10.5' (12.04' Thick. Sta 3+02) Sheet 6 of 6 <br />Critical section shear strength for 12-ft thick reinforced concrete deep-beam bending <br />stress design for earthquake acceleration: (Continued) <br />Ratio of tensile reinforcing steel (p H,): <br />As <br />p •- p w = 0.000646 for one two-way row of#10 bars, 12-in c-c <br />`° b N,~12•d <br />Allowable concrete shear strength (V ~) at critical section: <br />Vc:=K~~1.9• Cc+2500~pµ,•Mu• ~l•12•bµ,•d Ve=548601 Ib <br />Limiting allowable value for term V e cannl/ot exceed V <br />max <br />V max ~_ (6~ fc)•b N,•12•d V max = 553997 lb <br />Use lower of V. max or V ~ to calculate factor of safety for factored critical section sheaz stress V „ <br />V <br />FS:_-° FS=2.67 <br />Vu <br />x69tdlemd snnsu~ ~ cv nre <br />