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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 />Hydrodynamic pressures during earthquake shall be determined in <br /> <br />accordance with the equations presented in attached Figure 1. <br /> <br />The effect of earthquake on fills behind structures shall be considered. <br /> <br />The dynamic increment of fill pressures shall be computed as 20 percent of the static fill <br /> <br />pressure. The distribution of this dynamic increment shall be triangular with the apex at <br /> <br />the base of the structure. The resultant pressure shall be appl ied horizontally to the <br /> <br /> <br />back of the wall at a depth of 2/3 H. above the base. <br /> <br />F . Temperature <br /> <br />An air temperature range af -200F to t90aF shall be considered. For <br /> <br />stress computations it shall be assumed that a temperature differential of plus or minus <br /> <br />SOoF from the temperature at installation could occur. <br /> <br />G. Ice <br /> <br />Ice loads, where applicable, shall be considered as a line load of <br /> <br />1 kip/ft due to a 6" thick ice sheet with no lateral restraint of the sheet, no consideration <br /> <br />of solar radiation and 0 SOF/hr temperature rise. <br /> <br />V. ALLOWABLE WORKING STRESSES <br /> <br />A. Application <br />The allowable unit working stresses for concrete, reinforcing steel and <br />structural steel given in paragraphs B, C and 0 below are intended for appl ication where <br />"the loading includes only the following: <br /> <br />Water pressure - static (Normal reservoir level) <br />Uplift <br />Dead Load <br />Live Load <br /> <br />Earth Pressure <br /> <br />-6- <br />