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Steve Adit Bulkhead, As-Built <br />Project, Sta.2+65 By MEL/JFA Date 3/28/08 <br />10' Thick, 7'-7" Wide, 8'-2" High, Sheet 7 of 8 <br />#6 Rebar <br />Critical section shear strength for 10-ft thick reinforced deep-beam concrete bulkhead <br />subjected to maximum credible earthquake: <br />Deep-beam bulkhead defined as wb/Lt < 4 (ACI 318-02, Sec 10.7). The critical shear section is <br />0.15 times the maximum bulkhead width (2.25 ft) from the ribside (ACI 318-02, Sec 11.8.5). <br />~'~'b <br />- = 0.8 which is less than 4. Therefore, this is a deep beam for design. <br />When wb/Lt < 4, the limiting nominal shear stress (v„) cannot exceed <br />10 times the sq rt of f~ (ACI 318-02, Secl 1.8.3). <br />v„ := 10•~ v„ = 799 psi <br />Therefore, the maximum allowable nominal shear force per foot of beam width is: <br />V„a := v„• 12•bw d V„a = 1117526 lb per 1-ft wide horizontal deep beam <br />Nominal developed shear force at critical section per foot of horizontal deep beam width <br />V„d := 0.35•u•wb V„d = 37759 lb per 1-ft wide horizontal deep beam <br />Factored nominal developed shear force at critical section per foot of horizontal deep beam <br />width <br />Vu := Vnd V„ = 50345 lb per 1-ft wide horizontal deep beam <br />~rs <br />Nominal developed moment at critical section per foot of horizontal deep beam width <br />2 <br />U•(Wb <br />1V~,y,, := 0.06375 • 2 M„ = 26100 ft-lb per 1-ft wide horizontal deep beam <br />Factored nominal developed moment at critical section per foot of horizontal <br />deep-beam width <br />M„ <br />NCI :_ ~n M„ = 29000 ft-lb per 1-ft wide horizontal deep beam <br /> <br />