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5. Structural Design <br /> 5.1 Concrete Structures <br /> The reinforced concrete elements were designed in accordance with the requirements of the <br /> American Concrete Institute's "Building Code Requirements for Structural Concrete" [ACI <br /> 318-08] and guidance from the US Army Corps of Engineers' "Strength Design of <br /> Reinforced Concrete Hydraulic Structures" (USACE, 1992). Structural stability loading <br /> conditions were analyzed in accordance with the U.S. Bureau of Reclamation's "Design of <br /> Small Dams" (USBR, 1987) and guidance from the US Army Corps of Engineers' "Stability <br /> Analysis of Concrete Structures" (USACE, 2005). <br /> The design compressive strength for reinforced concrete is 4,500 pounds per square inch - <br /> (psi). The design density of concrete is 150 pounds per cubic foot (pcf). Steel reinforcing <br /> bars will be grade 60 (60,000 psi yield strength), uncoated except as otherwise noted. During <br /> construction, the concrete strength requirement of 4,500 psi must be attained to achieve the <br /> overall design intent for the intake structure and outlet impact basin. <br /> 5.2 Outlet Conduit <br /> The outlet conduits for the interconnects will be composed of steel pipe. Uncoated, cement <br /> mortar lined steel pipe will be used for all interconnect pipelines. The steel pipe design will <br /> be performed by the selected contractor based on the forces imparted to the pipe during <br /> trenchless installation. The steel pipe will be installed by tunnel boring machine or other <br /> approved methods and the pipe annulus grouted after installation is complete. <br /> 5.3 Trashrack <br /> The trashracks on the intake structure will be composed of ASTM A36 steel flat bars, plates, <br /> and angles (yield strength of 36,000 psi). Welds will be in conformance with American <br /> Welding Society (AWS) D1.1 and E70 electrodes will be used for all welds. The trashracks <br /> will be hot-dipped galvanized and fastened to the intake structure concrete with post-installed <br /> epoxy anchors. The trashracks were designed for differential pressure equal to 50 percent <br /> clogging at normal water surface elevation. <br /> Structural design calculations are included in Appendix E. <br /> M <br /> Structural Design C 15 <br /> GEI <br />