Laserfiche WebLink
kpff <br />March 13, 2009 <br />Ms. Teresa Cooper <br />Project Manager <br />KDC Architects Engineers, PC <br />4720 200th Street Southwest, Suite 200 <br />Lynnwood, WA 98036 <br />Subject: SEAQ GarfiEld 150-Foot Monopoie <br />Tower Re•Analysis <br />Dear Ms. Ccoper. <br />�c`�D3-C�� <br />i%Je have received and con�pleted your request for a tower re-analysis of the SEAQ Gartieid 150-foot <br />monopole in Snohomish Co� nty. KPFF Consulting Engineers was retained by KDC Architects <br />Engineers, PC, in September 2008 for the purpose of analyzing the above-mentioned tower to <br />support the addition of twelve 8-foot Antel LPA-80080•8CF antennas, and a mounting platform at <br />the 150-foot elevation, with six associated 7/8-inch coaxial cables and six 15/8-inch coaxial cables <br />(see KPFF report project number 108419.10 and letter issued on November 13, 2008). All <br />feedlines are located on the inside of the monopole. During analysis, design parameters of 75 mph <br />wind with no ice, and 65 m►ih with 1/2-inch radial ice for Snohomish County, Washington, were <br />used according to the requirements of ANSI/TIA-222-F Standard. <br />As requested, antennas and the mounting platform are to be moved from the 150-foot elevation to <br />the 110-foot elevation, to provide a 114-foot antenna tip height. Associated feedline elevations will <br />be char.ged as weli. Additionally, changes to antennas and feedlines are as fol�ows: Antennas now <br />include six 8-foot Antel LPA-80080-9CF antennas, three 8-foot Antel BXA-700631/8CF antennas, <br />and three 4-foot Antei BXA-185085-12CF antennas for a total of twelve antennas. Feedlines now <br />include tweive 7/8•inch coaxial cables and six 15/8-inch coaxial cables. Re•analysis showed no <br />significant increases in stresses, deflections, tilts, or twists. The increases in maximum section <br />capacity for both proposed and existing cases ar� summarized in the table below: <br />Existing Case <br />Proposed Case <br />Before Re-Analysis <br />55.6 percent of capacity <br />75.8 percent of capacity <br />After Re-Analysis <br />55.6 percent of capacity <br />67.3 percent of capacity <br />1601 FIlf� Avenue Su/fe 16U0 Sca(tle. WA 98101 �106/ 622•5B1P Fa+ (106J 62T-H130 <br />1rL [ ,... � 1����� r � ,. .,,� i �, .. c i. L q�g '1 tira[h ' l:saena In'u:n <br />c. 1 i i.. I��. .� i lu. !.'�e� i�� .�.. �.i ,.r' . !'.in, li:�E <br />� � <br />� <br />