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11/13/2007 13:58 FAX <br />c <br />10017/018 <br />Project, Steve Adit Bulkhead, Sta- 2+65 By n'IEL/JFA Date 10/30/07 <br />10' Thick, 10' Wide, 10 High, #6 RebaX_ 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). The critical shear section is <br />0.15 times the maximum bullchea.d width (2.25 ft) from the ribside (ACI 318-02, See 11.8.5). <br />Wb <br />-- = 1.0 which is less than 4. Therefore, this is a deep beauri for design. <br />When wb/Lt < 4, the limiting nominal shear stress (v,,) ewinot exceed <br />10 times the sq rt of f, (ACI 318-02, Seel 1.8.3). <br />vn := 10. fl v„ = 548 psi <br />Therefore, the maximum allowable nominal shear force per foo!. of beam width is: <br />Vnn := vn' 12-bw-d Vn;, = 765716 lb per I-ft wide horizontal deep beam <br />Nominal developed shear ford at critical section per foot of horizontal deep beam width <br />Vnd := 0.35• a-wb Vnd = 44940 lb per 141 wide horizon:lal deep beam <br />Factored nominal developed shear force at critical section per foot of horizontal deep beam <br />width <br />Vu := Vnd V,, = 59920 ]b per 1-ft wide horizontal d::ep beam <br />Ors <br />Nominal developed moment at critical section per foot of horizontal deep beam width <br />vl 0.06375• u' (wb 2) 2 N/1, = 40927 ft-lb per 1-ft wide horizontal deep beam <br />Factored nominal developed moment at critical section per loot c.f horizontal <br />deep-beam width <br />Mn <br />'LM ML, = 45475 ft-lb per 1-ft wide horizontal, deep beam