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Pierce Adit Bulkhead, As-Built <br />Project, Sta.2+84 By MEL/JFA Date 3/28/08 <br />12' Thick,ll'-7" Wide,11'-8" High, Sheet 7 of 8 <br />#6 Rebar <br />Critical section shear strength for 12-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 0.15 <br />times the maximum bulkhead width (2.25 ft) from the ribside (ACI 318-02, Sec 11.8.5). <br />~'b <br />= 1.0 which is less than 4. Therefore, this is a deep beam for design. <br />When wb/Lt < 4, the limiting nominal shear stress (vn) cannot exceed <br />10 times the sq rt of f~ (ACI 318-02, Secl 1.8.3). <br />v„ := 10•~ v„ = 730 psi <br />Therefore, the maximum allowable nominal shear force per foot of beam width is: <br />Vna := vn• 12•bWd Vna = 1230895 lb per 1-ft wide horizontal deep beam <br />. Nominal developed shear force at critical section per foot of horizontal deep beam width <br />Vnd := 0.35•u•wb Vnd = 62557 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 Vu = 83409 Ib per 1-ft wide horizontal deep beam <br />~rs <br />Nominal developed moment at critical section per foot of horizontal deep beam width <br />u• 1 ~'b2/ <br />M~:= 0.06375• 2 Mn = 66030 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 />Mn <br />Nom, :_ ~rt M„ = 73367 ft-Ib per 1-ft wide horizontal deep beam <br />• <br />