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C"R'ia'�•Y_'.. - - '\'F��- �.. - __} _ .CRS: - � .w' _ _ _ -_ `t: _ _ <br /> w r •V Js x _ <br /> �Y <br /> Project No. 90161.e <br /> 7 ,lune 1990 <br /> This formula was derived with a factor of safety of greater than <br /> i ; <br /> 3 to allow for some differential in materials. <br /> In no case should an allowable bearing pressure in excess of 7000 <br /> p.s.f. be utilized without review by the Geotechnical Engineer. <br /> 3. The above allowable pressures are for support of dead plus <br /> is <br /> ; F live loads and may be increased by 1/3 for short term wind and <br /> seismic loads. <br /> 4. For resistance to lateral loads, a friction factor of 0.25 <br /> j ' <br /> may be utilized below the base of spread footings. A passive <br /> resistance of 250 p.c.f. equivalent, fluid weight may be utilized <br /> i <br /> against the side of shallow footings or 350 p.c.f. for depths <br /> s ` <br /> ^� greater than 2 feet. if friction and passive pressures are <br /> ! ' combined, the larger value should be reduced by 50%. <br /> 11 <br />