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11/13/2007 13:57 FAX <br />Project, Pierce Adit Bulldiend, Sta. 3+04 <br />12' Thick, 12' Wide, 12' High, 96 Rebar <br />Q 009/0 18 <br />By 1L/JFA Date 10/30/07 <br />Sheet 7 of 8 <br />Critical section shear strength for 12-ft thick reinforced deep-beam concrete bulkhead <br />subiected to maximum credible earthquake: <br />Deep-beam bulkhead defined as wb/Lt < 4 (ACI 318-02, Sec 10.7). They critical shear section is 0.15 <br />times the maximum bulkhead width (2.25 ft) from the ribside (ACT 318-02, Sec 11.8.5). <br />wb <br />= 1.0 which is less tha:i 4. Therefore, this is a deep beam ;,or design. <br />Lt <br />When wb/Lt < 4, the limiting nominal shear stress (v„) cminot exceed <br />10 times the sq rt of f, (ACI :118-02, Sec]. 1-8.3). <br />VII := I0•F v„ = 549 psi <br />Therefore, the maximum allowable nominal shear force per foot of beam width is: <br />V11:= v,• 12•bw-d Vr,., = 923460 lb per 1-ft wide horizontal deep beam <br />Nominal developed shear force M critical section per foot of hori%Dntal deep beam width <br />Vnd := 0.35•u-wv V„ d = 58632 lb per 1-ft wide horizontal deep beam <br />Factored nominal developed shcar force at critical section per foot of horizontal deep beam <br />width <br />Vu := Vnd Vu = 78176 Ib per 1-ft wide horizontal deep beam <br />Ors <br />Nominal developed moment w critical section per foot of horizontal deep beam width <br />u' u'b 2) MW:= 0.06375• 2 Mn = 64077 !t-lb per l-ft wide horizontal deep beam <br />Factored nominal developed moment at critical section per foot of' horizontal <br />deep-beam width <br />Mn <br />1 :_ n Mu = 71 l 96 ft-lb per I-ft wide horizontal sleep beam <br />Ort