Laserfiche WebLink
<br />~1 <br /> <br />. <br /> <br />" <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />MU~ 1::::1 Ul U.:J: .,..:IF' <br /> <br />~M';)\7k)f <br />~\ ~V"",a.lb)~ <br /> <br />f,1 <br />~~,'Eh~sma~n <br />,. Englneenng Inc. <br />and Associates <br /> <br />4400 West 31st Sl. - Yankton, SO 57078 <br /> <br />Phone: (805) 665-7532 Fax: (605) 665-9780 <br /> <br />E-Mail: eei@byelectrie.com <br />Web Address: http://SdibLnorthern.sdu/ehresmann <br /> <br />August 15, 2001 <br /> <br />Mr. D.R. Vaughan <br />Arden Towers, Inc. <br />3440 Bayside Road <br />Orono, MN 55356 <br /> <br />Subject: 700' Rohn Model 80 Guyed Tower <br />Site: Arden, MN <br /> <br />DearMr. Vaughan: <br /> <br />1 have pulled the file on the above described tower. The tower was analyzed in accordance <br />to the current code, TIAIF.1A-222_F with 80 mph wind load. 112" ice reductinn <br />allnwed for a modified tower 10 have an overall beight of 620'. <br /> <br />The infonnation for this tower was furnished to uS by your office concerning antenna and <br />line loads on Feb. 22, 2000. <br /> <br />Tower 1.' <br />The maximum combined stress ratio in the leg is calculated ~ which is less <br />than the allowable uf 1.33 O.K <br /> <br />Tower Diagonal: <br />The maximum combined stress ratio in the diagonals is calculated at 0.76 which is <br />tess than the allowable of L3J..Q.K. <br /> <br />Guy Straud: <br />The minimum guy safety factor is calculated at..1.22 which is equal to the <br />allowab]e of 2.00 0 K. <br /> <br />Foundations: <br />All reactions were compared to the original design values noted on the Rohn <br />foundation drawings which were furnished to us by your office. <br /> <br />Tower Base: <br />The base load was calCl.llated to be 240.5] kips yielding an actual bearing pressure <br />of3450 p.sJ. which is approximately equal to the allowable of 3000 p ..f. O.K. <br /> <br />Antenn.a Support Structures - Guyed and Self-Supporting Towers and A1{Jn.opole.s . Steel FQbricatwn <br />Str/,J,ctura.i Analy_~is - ]n...~ction . Specifico.tion;oj - Project Monagemettt _ Deta.iling _ P.E. Certification <br />