HomeMy WebLinkAboutLETTER-AMERICAN TOWER SYSTEMS96 FRI 13:53 DEAN MEAD NINTON
E CQMMUNICUIONS TEL:712-258-8250
FAX NO. 4074647877
Nov 21 96
P. 02/02
17:54 No.022 P.02
Q
SABRE COMMUNICATIONS CORPORATION
3490 HWY. 75 NORTH . P.O. BOX 635 . SIOUX CITY, iOWA $1102
TELEPHONE: (712) 26$.-Ago FAX. (712) 2664I230
November 20, 1996
ANN20
American Tower Systems BY
6400 North Congress Ave. s$.,Li-.am*
Suite 1750
Boca Raton, FL 33487
Dear Mr. Hess,
aid a13 9�/ea5(
L7 P- Ct�^�L
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I am writing this letter in reference to your request for Sabre Communications
Corporation to determine the mode of collapse of the self supporting lattice steel type
communications tower that you have ordered for your 1-95 network in Florida.
As you well know, communication towers are designed in strict accordance with the
Electronics Industry Association Standard EIAITiA 222-F as well as local building
codes. Further, American Tower Systems has taken the additional precaution of
specifying that all of the tower members be 1 /3 larger than required by code. Having
dune this you have increased the weight, rigidity and survival capacity of the tower.
Although it is extremely rare for a self-supporting tower to collapse, most failures occur
in catastrophic winds such as tornadoes or hurricanes- Your towers have a survival
capacity of approximately 160 mph, in wind speeds of this magnitude, total devastation
to the surrounding area woulO occur.
A self-supporting tower will most likely fail in the middle sections rather than at the
tower base. Therefore, we believe that in 90 to 95 percent of the oases where a failure
would occur, the tower would collapse upon itself within the 40 to 50 foot setback from
the base of the tower.
We trust that this information confirms your knowledge and our experience that towers
are designed to survive rather than collapse. Please lot us know if you have any
questions or require additional informatlon.
Sincerely,
SABRE CO MUNiCATIONS
ichael T. De Boer, P.E.
ttief Engineer -
ANTENNA SYSTEMS. trF. UHF. VMF - TOWER SYTEMS AOTN GUYED 6 SELF SUPPOltt yp FOR iHICROWAVLz, CELLULAR,
BROADCAST, CAN i SPECIAL APPLICATION$ - PREASSFMRLEo BUILDINGS IN ALUMINUM. FIBERGLA66. 6TeeL, s C'UMRETE -
STRUCTURAL ANALYSIS - ANTEVMMOWER INSTALLATION - WORLMM9 mr-Lo tERvICEC - INSMCTrON 6, ONCE
1.... ..._...—
!2 6 FRI 13:53 DEAN MEAD MINTON . FAX NO. 4074647877
P. 01/02
DEAN, MEAD & MINTON
AT7VHNKYS AND COUNSELORS AT LAW
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