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11/l;j/1?J•?r 14 D n rnx <br />Project, Steve Adit Bulkhead, Sta. 2+65 <br />10' Thick, 10' Wide, 10' Thigh,'46 Rebar_ <br />L9J vlf/VIh <br />By I1'[EL/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 />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 (A CI 318-02, Sec 11.8.5). <br />wb <br />= 1.0 which is less than 4. Therefore, this is a deep bealr for design. <br />LI <br />When wb/L t < 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 />vn := 10• Tc v„ = 548 psi <br />Therefore, the maximum allowable nominal shear force per foot of beam width is: <br />Vn„ := vn• 12•bw-d Vn,, = 765716 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 = 44940 lb per 141 wide horizontal deep beam <br />Factored nominal developed shear force at critical section per foot of horizontal deep beam <br />width <br />Vnd <br />V. Vu = 59920 )b per 1-ft wide horizontal deep beam <br />Ors <br />Nominal developed moment at critical section per foot of horizontal deep beam width <br />u' w'b <br />0.06375• 2 MI, = 40927 ft-lb per 1-1t wide horizontal deep beam <br />Factored nominal developed moment at critical section per foot c ,f horizontal <br />deep-beam width <br />Mn n M„ = 45475 ft-lb per 1-ft wide horizor_taJ. deep beam <br />?r[