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CCP 07-16-2001
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CCP 07-16-2001
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5/8/2007 1:16:41 PM
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<br />, ' <br />.' <br /> <br />. , <br />'. <br /> <br />. <br />, , <br /> <br />e <br /> <br />Results, OPtion 1 = ExistinG Tower with Existino Antennas. <br />80 MPH wind and'no~ Analvsis per <br />TIA/EIA-222-F. <br /> <br />Mast: <br /> <br />~eas: The maximum combined stress ratio in the <br />vertical members is 1.21 at elevation 180' <br />which is less than the maximum allowable <br />value of 1.33. See comments. <br /> <br />Diao: The maximum combined stress ratios in the <br />bracing members is 0.95 at elevation 400' <br />which is less than the maximum allowable <br />value of L 33. See comments. <br /> <br />GUVS; The minimum guy safety factor is 2.42 at <br />elevation 520' which is greater than the <br />minimum required value of 2.00. See comments. <br /> <br />foundation: <br /> <br />~ase: Actual axial load at base of tower per our analy- ... <br />sis is 232,300 Kips. This results in a net bear- ., <br />iog pressure of 3337 PSF based on foundation <br />drawing number C810975 bY Onarco-Rohn. Allowable <br />net bearing pressure is 3000 PSF based on, drawing <br />number C810975 by Onarco-Rohn and soils report by <br />Subterranean Engineering, Inc. date July, 1981. <br /> <br />EEl cannot comment on nor account for the existing <br />soils under the base foundation to safely support <br />this increased net bearing pressure. We suggest <br />the vertical load at the base of the tower is <br />forwarded to Subterranean Engineering, Inc. to <br />review th~ ,base design and their sofls report to <br />determine if soils are adequate. Modifications <br />may be required. <br /> <br />Inn ~ Actual vertical uplift load of 14.53 Kips and an <br />actual horizontal load of 18.79 Kips per our <br />analysis. Per the original reactions furnished to <br />Subterranean Engineering, Inc. by Unarco-Rohn, the <br />inner anchors were design for an uplift load of <br />17.10 kips and a horizontal load of 21.80 kips. <br /> <br />Due to the lack of information regarding the <br />eXisting anchor shaft, EEl cannot comment on nor ~ <br />account for the capacity of the existing anchor .., <br />shaft to develop reactions per our current <br />analysis. <br /> <br />3 <br />
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