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Project, Steve Adit Bulkhead, As-Built By MEL/JFA Date 3/28/08 <br />Sta.2+65 Sheet 8 of 8 <br />10' Thick, 7'-7" Wide, 8'-2" High, <br />#6 Rebar <br />Calculation equation for allowable shear strength (V~) at critical section of deep beam, <br />including rebar tensile reinforcement, <br />V~ := K• 1.9•~ + 2500•pW ~ • i2 •12•bW•d <br />u <br />Maximum permitted calculated concrete shear strength (v~): (ACI 318-02, Sec 11.8.3) <br />v~ := 6•~ v~ = 480 psi <br />AS <br />Ratio of rebar reinforcement area to concrete area (p W), pW :_ <br />bW 12•d <br />Limiting value for term K = [3.5-2.5(MU/V„d)] = 2.5 <br />M <br />~:= 3.5 - 2.5• V d K = 3.352 Therefore, ~:= 2.5 <br />U <br />12 <br />Allowable shear strength (V~) at critical section of deep beam, <br />V~ := K• 1.9•~ + 2500•pW iV1 • i2 •12•b~,,•d <br />u <br />V ~ = 577173 lb per 1-ft wide horizontal deep beam <br />Limiting allowable shear force cannot exceed: <br />Vmax ~= v~•bN,• 12•d Vmax = 670516 <br />pW = 0.0003147 <br />Factor of safety using the lower of calculated V~ or V,,,~ in relation to maximum credible <br />earthquake loading induced factored nominal developed shear force (V„) at critical section, <br />FS := Vmax FS = 13.318 <br />'~""" V <br />u <br />