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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />When the loading includes any of the loads listed below in combination with any of the <br /> <br />above, the allowable stresses may be increased by 33 1/3 percent: <br /> <br />Maximum design flood <br />Earthquake <br />Wind <br />Construction or erection loads <br />Thermal stresses <br />Shri nkage stresses <br />Impact <br /> <br />B. Concrete <br /> <br />Allowable unit working stresses used for design of concrete and reinforced <br /> <br />concrete structures shall be based on an ultimate strength in compression, f' c' of 3,000 <br /> <br />psi and shall be computed in accordance with the provisions of the latest edition of the <br /> <br />ACI Building Code Requirements for Reinforced Concrete except that allowable compres- <br /> <br />sive flexure stress for submerged structures shall be 1,100 psi. <br /> <br />The spillway bridge shall be designed in accordance with the provisions <br /> <br />af the latest edition of the AASHO Standard Specifications for Highway Bridges. <br /> <br />C. Reinforcement <br /> <br />The reinforcement wi II conform to the requi rements of ASTM-A615 de- <br /> <br />farmed bars, Grade 40 (fy = 40,000 psi). The allowable stresses shall be computed in <br /> <br /> <br />accordance with the latest edition of the ACI Code except thot for submerged structures <br /> <br />the allowable tensile stress (fs and fv) shall be 16,000 psi. <br /> <br />D. Structural Steel <br /> <br />Structural steel will conform to the requirements of ASTM-A36, Struc- <br /> <br />tural Steel. Allowable stresses shall be computed in accordance with the provisions of <br /> <br />the latest edition of the A1SC Specification for the Design, Fabrication and Erection of <br /> <br />Structural Steel for Buildings. <br /> <br />-7- <br />