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B- Level/Brenneman Bul d Design <br />Critical section shear design requirements for deep beams are not applicable because the <br />B- Level/Brenneman bulkheads are not deep beams for design. Shear strength must be <br />provided to comply with ACI requirements for nonprestressed members subject to shear and <br />flexure only (ACI 318R -92, Sec 11.1.3.1, Sec 11.3.2.1). <br />Factored shear load (V ") and bending moment (Mu) at critical section at distance "d" from <br />face of support (tunnel ribside) for simply supported, uniformly loaded, one -way, one -foot <br />wide beam. <br />co = U = 0p(144) = 1.4(30)144 = 6050 ft <br />cvl 2 — d I — 60501 12 ) 5 I <br />/ — 10800 — <br />V " ¢ ` 0.85 0.85 127001b <br />wt 6050(9 <br />M = 8 — 8 — 61300 ft•lb <br />M" = <br />M _ 613 000 — 68100 ft lb (817000 in • lb ) <br />0.9 <br />0 <br />Shear strength for nonprestressed bulkhead subject to shear and flexure only; <br />Provided by concrete, tension reinforcing plus shrinkage and temperature steel (ACI 318R, <br />Sec 11.1, Sec 11.3.2.1) <br />V� = (1.9/f: + 2500p " Jb Limiting value ° < 1.0 <br />M. <br />A, _ 1.27 + 0.44 _ 1.71 - 0.00438 <br />P., __ b (12)32.5 (12)32.5 <br />12700 (32.5 <br />12 <br />V� = 1.9 2500 + 2500(0.00438) (12)32.5 = [95.0+ 5.51390 = 39200 lb <br />68100 <br />Limited to V <_ 3 gb W d = 3 2500 (12)32.5 = 61800 lb <br />V d 12700(3 2 5) <br />u — <br />M" 68100 <br />Page 6 February 21, 1994 <br />— 0.505 Less than limiting value of1.0 <br />