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Project Design Mogul Tunnel Bulkhead By JFA Date 8/21/03 <br />10.6' x 9.5' f 9' Thick. Station 2+41) <br />Sheet 5 of 6 <br />Critical section shear strength for 9-ft thick reinforced concrete deep-beam bending <br />stress design for earthquake acceleration: <br />Deep beam defined as Ud<5 (ACI 318-95, Sec 11.8.1). This is the case for earthquake acceleration of <br />0.094g and critical section shear at 0.151(1.20 ft) from ribside (ACI 318-95, Sec 11.8.5). <br />1~~ 12) = 1.217 < 5 Therefore, this is a deep beam for design! <br />d <br />v „ -nominal shear stress shall not be greater than 8 times sq rt of f ~ when Ud < 2 (ACI 318-95, <br />Sec 11.8.7) <br />Limiting values: v n := 8~ 3000 v n = 438.2 psi <br />V n := v n~ 12~b µ,•d V n = 549475 -b/ft, limiting shear force per foot of beam <br />width <br />Developed shear force at critical section: <br />V n := 0.35 ~u•I V u = 87643 Ib/ft, nominal shear force per foot of beam <br />width <br />v <br />V u :_ -° V ~ = 103109 16/ft, factored shear force per foot of beam width <br />~~ <br />Developed moment at critical section: <br />z <br />M n := 0.06375 • u ~ l~ M n = 84606 ft-lb, nominal critical bending moment per foot of <br />2 beam width <br />M <br />M u :_ -° M ~ = 94007 ft-]b, factored critical bending moment per foot of beam <br />~ rt width <br />Permitted concrete shear strength (v ~): <br />Limiting value for v~ v c := 6 f c (ACI 3 ] 8-95, Sec 11.8.7) <br />v e := 6 f e v ~= 328.6 psi <br />Limiting value for term K = [3.5-2.5(M„N „d)] _ <br />2.5 2.5 •M u <br />K:=3.5- K=3.238 <br />V u•d <br />12 <br />Therefore, K := 2.5 <br />M~a~~eersviso~s:n.u, <br />