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Gold Prince Mine Bulkheads Page 2 August 19, 1996 <br /> Requirements for Reinforced Concrete (ACI 318-92, Rev 1992, <br /> Sections 10.6.4, 10.6.7, 14.3.2, 14.3.3) . The design <br /> specifications for depths that exceed 3 feet (Section 10.6.7) <br /> require consideration of the outer 12 inches of the bulkhead. For <br /> the main bulkhead the required minimum ratio of vertical steel <br /> rebar reinforcement area to gross concrete area per foot is: <br /> 0.0012 (12) 12 = 0.17 in2/ft [Section 14.3.2 (a) ] <br /> #4 bars on 12-inch centers provide 0.20 in2/ft of steel. <br /> The required minimum ratio of horizontal steel rebar reinforcement <br /> area to gross concrete area per foot is: <br /> 0. 0020(12) 12 = 0.29 in2/ft [Section 14.3.3 (a) ] <br /> #5 bars on 12-inch centers provide 0.31 in2/ft of steel. <br /> The 2.5-foot thick portal bulkhead temperature and shrinkage <br /> reinforcement requires that the rebar have the capability of <br /> supporting 145 kips/in at service load (fj . Since no rebar <br /> reinforcement is required to support the 14 feet of maximum head <br /> the same temperature and shrinkage rebar designs can be used. The <br /> temperature and shrinkage rebar cages should be positioned <br /> approximately 3 inches from the faces of the bulkheads. <br /> I hope this provides you with the necessary design <br /> recommendations. <br /> Sincerely, <br /> John F I, V, k <br /> . Abel, Jr. <br /> Colorado P.E. 5642 <br />