HomeMy WebLinkAboutMUP22-0008 10. Tower Structural Review Letter
October 20, 2022
Ms. Chelsea Reeves
Project Controls Coordinator Sr.
Tillman Infrastructure, LLC.
299 Market St, Suite 350
Saddle Brook, NJ 07663
RE: 105’ Monopole for TI-OPP-22447, CA
Dear Ms. Reeves,
Upon receipt of order, we propose to design and supply the above-referenced monopole for a
Basic Wind Speed of 94 mph, Risk Category II and Exposure Category C, in accordance with
the Telecommunications Industry Association Standard ANSI/TIA-222-H, “Structural Standard
for Antenna-Supporting Structures and Antennas and Small Wind Turbine Support Structures”.
When designed according to this standard, the wind pressures and steel strength capacities
include several safety factors. Therefore, it is highly unlikely that the monopole will fail
structurally in a wind event where the design wind speed is exceeded within the range of the
built-in safety factors.
Should the wind speed increase beyond the capacity of the built-in safety factors, to the point
of failure of one or more structural elements, the most likely location of the failure would be
within the monopole shaft. Assuming that the wind pressure profile is similar to that used to
design the monopole, the monopole will buckle at the location of the highest combined stress
ratio within the monopole shaft. This is likely to result in the portion of the monopole above
leaning over and remaining in a permanently deformed condition. Please note that this letter
only applies to the above-referenced monopole designed and manufactured by Sabre
Industries. This would effectively result in a fall radius less than or equal to 105 feet.
Sincerely,
Keith J. Tindall, P.E.
Vice President, Telecom Engineering