Agenda - Council - 01/25/2000 - Laserfiche WebLink

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· Valmont Industries, Ino, · West Highway 275, P.O, Box 355. Valley, Nebr~ 68064-0355 U.S.A. · (402) 359-2201 · . August US West Wireless, LZXT, 426 North Fairviow Avenue Suite 101 .teentiun: 1V~. A~'~::tan Sehottroff Failum ~., %des for Poles av.d ~ ~e, seription of th. L~ign Criteria US Wes::, .,qireless Site: SCLC ~'$ VMmon~ C;der No, 17453.-9~ Dear Mr, t have b~en ask?i ~ ~ write to you ~bo~ ~:~ mode off~~ ~r ~le ~e s~e~u~ t~sed to ~z~ppo~ ~ele~;~ -~ ',~n~ ~ aud ~.fpmen~ ~d gi'~:, so~ne ~o~fion te ~iow you to judge how rem~.~ ~ offby a The polos VaLmont ~'uppl/es are desi~.ed in aecerdaneo wks. E.I~Zr.LA. 2×g Revision F entitled "Struettu~ Standards for E:~ei A. ntenn~ Towers _~u~ Antenna Supper" :~ Structures." ]his is ~ approve~ A.N. SJ, standar4 ~hat h~ dealt w~t.h ~'[,~ design of lattice C~yp~ structures for number'ofyears. Revision E is tho f~ version that goes into extensive detail ~bout the design of pole ~ype structures. The provisiens oft. he sfamdard t~ve, as their foundatb~, provisions of other nationally ~own speeLfications and standards tha,,~mve a long history of;eliability. This history should be ofintemst tn you ~idering the hundre~s of thousands (if not millions) of sites throughou~'tho United States wMch have structures d~sign~ with concep~ spelled out in publications like "The Design of Steel Transmission Po!~ ~qtructures" (published by A.S.C.E,), and "Standard ~qpecLficat~ons for Structural Supports for Highway Signs, Luminaries and Traffic Signals" (published by A~$.I-LT.O.), Many of the concepts used m design poles in these two mblica,ti0ns are included in the E.Ia~Jr.I~ 222 Revision F Standard. The E.I,AJT.I.A, 2:22 Revision F requirements diotat~ a basic design wind speed. The wind speed'.n be used depends on the location ofttm sit~ witfi/n the state. Valmont's policy is ~o use the wind load/rig in E,I.AJTJ~ 222 as am~Mmum loading. Statistic, ally, the wind speed listed in E,I~JT.I,4, 222 has been determined ~o be that wind which has an average reoccurrence of 50 years. This wind is also a "faStest mile" wind which means that it/s the ~verage velocity of a mile wind passing a point. For example, a 70 mph ~verage fastest mile wind would take 5 t seconds to pass a point. This standard "fastest riffle" wind is customized with fairs that apply to the particular installatiom Them is a 1.69 gust response factor imposed to acemmt for sudden 1 I I .I I I I I I I I I I I I I I I