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Bulkhead Design <br />Page 6 <br />• <br />Design <br />Wall to be 24" thick, solid reinforced concrete. The concrete shall have <br />a compressive strength of. at least 3000 psi in 28 days. Both sides of the <br />wall shall be reinforced vertically with #10 bars at 4" center ~:o center. <br />Both sides of the wall shall be reinforced horizontally with #8 bars at <br />12" center to center. Stirrups shall be 0-shaped made from #4 bars spaced <br />8 3/4" center to center, vertically. Each stirrup shall encompass 3 #10 <br />bars (see design sketches). The bars shall have f'y = 60,000 psi and be ASTM <br />A572 - 72 Gr. 60. The bulkheads shall have a height of no more than 10 feet. <br />The bulkhead shall be hitch a minimum of 12" into the roof, ribs and floor. <br />The gap made by hitching the bulkhead will be filled in with concrete. <br />Symbols <br />Shear Notation Summary: <br />Av =area of shear reinforcement within a distance s, or total cross <br />sectional area of one stirrup (sq. in.) <br />b = width of rectangular beam (in.) <br />• h = overall thickness of member (in.) <br />s = spacing of stirrups (in.) <br />Y~ =nominal permissible shear stress carried by concrete <br />~y = nominal total design (ultimate) shear stress <br />Y = (/u- /~ ) =excess shear to be resisted by stirrups <br />Reference: "Simplified Design of Reinforced Concrete" by Harry ParXer; <br />Fourth Edition; Copyright 1975, John Wiley and Sons, Inc. <br />American Concrete Institute's "Building Code Requirements for Reinforced <br />Concrete (ACI 318-71). <br />