HomeMy WebLinkAbout2012-07-17 Planning Board Supplemental Materials99-ft Self-Supporting Pole Structure
(Concealed Monopole)
VSi Project 121203, Revision 0
June 12, 2012
TowerCo No. MA2010
Page 2of 2
2002 Production Drive, Apex, NC 27539 Ph: (888) 321-6167 Fax: (919) 321-1768 admin@verticalsolutions-inc.com
June 12, 2012
Subject Rigorous Structural Analysis
Carrier Designation Sprint/Nextel,Reconfiguration
Site Number: BS54XC860
Site Name: N/A
TowerCo Designation Site Number: MA2010
Site Name: Steven’s Estate
Engineering Firm Designation Vertical Solutions Project: 121203,Revision 0
Site Data 723 Osgood Street,North Andover,EssexCounty,MA01845
Latitude: N42°42'28.30"±; Longitude: W071°06'51.48"±
Elevation: 252ft±, Topography Category: 1;
Exposure Category: “C”; Structure Class II;Site Class “D”
99-ft Self-Supporting Pole Structure (Concealed Monopole)
Dear Ms. Godwin,
To your request, we present our structural analysis.
Our work indicates that with the proposed appurtenance configuration, the tower willnot satisfy the structural
strength requirements of ANSI/TIA-222-G-2-2009,Structural Standard for Antenna Supporting Structures and
Antennas –Addendum 2 (industry standard) and the 2009InternationalBuilding Code (local building code) for:
100-mph three-second gust basic wind speed
40-mph three-second gust basic wind speed with 1-in radial ice
Earthquake design parameters and loading, per USGS Ground Motion Parameter Calculator and industry
standard, respectively, including:
o Ss = 0.329,S1 = 0.075
However, foundation stress level is acceptable.
We trust you find our work satisfactory. Please do not hesitate to call should you have any questions.
Sincerely,
Kingsley C. Igboanugo, E.I.Michael L. Lassiter, S.E., P.E., C.W.I.
Structural Engineer-In-TrainingStructural Engineer, Civil Engineer, Certified Weld Inspector
& President
Reviewed by: JHWMA License No. 47314
Ms. Catherine Godwin
TowerCo, LLC
5000 Valleystone Drive
Cary, NC 27519
(919) 653-5737
Vertical Solutions, Inc.
PO Box 579
Holly Springs, NC 27540
(888) 321-6167
operations@verticalsolutions-inc.com
FAIL
(CanisterPipe,123%capacity)
06/12/2012