HomeMy WebLinkAboutDRB150027_DRB150027 Engineering Structural Letter_1422915000.pdf
ISE, Incorporated
Structural Engineers
PO Box 50039 Phoenix, Arizona 85076 Office: (602) 403-8614 Fax: (623) 321-1283 www.ISE-INC.biz
Structural Analysis & Evaluation Letter
PROJECT
AT&T COL04025 LTE 3C
Red Sandstone
545 N. Frontage Rd.
Vail, CO 81657
PREPARED FOR
Integrated Design Services
6551 S. Revere Pkwy – Suite 220
Centennial, CO 80111
ISE Project No. 8844
January 21, 2015
ISE, Incorporated
Structural Engineers Telecommunications & Industrial Design
PO Box 50039 Phoenix, Arizona 85076 Office: (602) 403-8614 Fax: (623) 321-1283 www.ISE-INC.biz
2
January 21, 2015 ISE Job #: 8844
Matt Archer
Integrated Design Services
6551 S. Revere Pkwy - Suite 220
Centennial, CO 80111
Subject: Structural Evaluation of existing Building Structure for proposed AT&T
antenna additions.
AT&T Site Designation: AT&T COL04025 LTE 3C
Red Sandstone
545 N. Frontage Rd.
Vail, CO 81657
Tower Owner/Site ID:
Mr. Archer,
At your request we have completed a structural evaluation of the existing building structure for
AT&T antenna additions at a 35’-0” rad center elevation. The analysis presented herein was
prepared per ANSI/TIA-222-G "Specification for Antenna Supporting Structures and Antennas" with
a 90 mph (3-Sec Gust) Basic Wind Speed. We prepared the attached evaluation for loading as
described in the AT&T RFDS dated 9/09/14.
Per our analysis:
1. The Building structure has adequate capacity to support the proposed loading under 90 mph
wind conditions as prescribed by ANSI/TIA-222-G.
Customer shall review the antenna and equipment listing presented herein and confirm that
the structure is accurately represented by our assumptions.
We are pleased to have been of service for this project. If you have any questions please feel free
to give us a call.
Sincerely,
Glen L. Hunt III, MS, SE/PE
Principal Engineer
ISE, Incorporated
Structural Engineers Telecommunications & Industrial Design
PO Box 50039 Phoenix, Arizona 85076 Office: (602) 403-8614 Fax: (623) 321-1283 www.ISE-INC.biz
3
TABLE OF CONTENTS
Title Sheet ....................................................................................................................... 1
Executive Summary ........................................................................................................ 2
Table of Contents ............................................................................................................ 3
Project Information .......................................................................................................... 4
Analysis & Results........................................................................................................ 4-6
Conclusions & Recommendations .................................................................................. 6
1/21/15
ISE, Incorporated
Structural Engineers Telecommunications & Industrial Design
PO Box 50039 Phoenix, Arizona 85076 Office: (602) 403-8614 Fax: (623) 321-1283 www.ISE-INC.biz
4
PROJECT INFORMATION:
Code Compliance: IBC 2012
Wind: IBC 2012 115 MPH Ultimate Wind Speed-reducible per 1609.1.1-Exception 5
ANSI/TIA-222-G, 90 MPH (3-Sec Gust) Basic Wind Speed, Structure Class II,
Exposure C, Topographic Category 1
Soils: N/A
Structure: 30’-0” AGL Building with 37’-2” AGL T/ Screen Structures
Project Documentation Provided by Customer:
Source Description Date
IDS AT&T LTE 3C CD’s September 9, 2014
AT&T 3C RFDS August 27, 2014
ANALYSIS & RESULTS:
Analysis Assumptions and Limitations
Information in the original design drawings or in the previous analysis that could not be
verified by ISE is assumed to be correct.
All support structure components are assumed to be in adequate condition to carry their
full design capacity.
The configuration of antennas, transmission cables, mounts and other appurtenances is
assumed to be as specified in this report.
Emergency/essential communication equipment is not located on the structure.
Antenna Loading:
The existing AT&T antennas are mounted on the rooftop of the building within a 4-sided
screen structure at a rad center elevation of 35’-0” above grade. The equipment
configurations considered for this analysis are as follows:
Existing:
Alpha
(1) Powerwave 7750 Panel Antenna (39#)
(2) Powerwave 7770 Panel Antenna (39#)
(1) Powerwave P45-16-XLH-RR Panel Antenna (53#)
ISE, Incorporated
Structural Engineers Telecommunications & Industrial Design
PO Box 50039 Phoenix, Arizona 85076 Office: (602) 403-8614 Fax: (623) 321-1283 www.ISE-INC.biz
5
(1) Raycap DC-48-60-0-9E Surge Arrestor (33#)
(3) Powerwave CM1007-DBPXBC-003 Diplexer (3#)
(3) Powerwave TT19-08BP111-001 TMA (22#)
(1) ALU RRH2x40W-07L (52#)
(1) ALU RRH2x40-AWS (44#)
Beta
(2) Powerwave 7750 Panel Antenna (39#)
(1) Powerwave P45-16-XLH-RR (53#)
(2) Powerwave CM1007-DBPXBC-003 Diplexer (3#)
(2) Powerwave TT19-08BP111-001 TMA (22#)
(1) ALU RRH2x40W-07L (52#)
(1) ALU RRH2x40-AWS (44#)
Gamma
(2) Powerwave 7750 Panel Antenna (39#)
(1) Powerwave P45-16-XLH-RR (53#)
(2) Powerwave CM1007-DBPXBC-003 Diplexer (3#)
(2) Powerwave TT19-08BP111-001 TMA (22#)
(1) ALU RRH2x40W-07L (52#)
(1) ALU RRH2x40-AWS (44#)
Proposed:
Alpha
(1) Powerwave 7750 Panel Antenna (39#)
(1) Powerwave 7770 Panel Antenna (39#)
(1) CCI HPA45R-BUU-H4 Panel Antenna (64#)
(1) Powerwave P45-16-XLH-RR Panel Antenna (53#)
(1) Raycap DC-48-60-0-9E Surge Arrestor (33#)
(2) Powerwave CM1007-DBPXBC-003 Diplexer (3#)
(2) Powerwave TT19-08BP111-001 TMA (22#)
(1) ALU RRH2x40W-07L (52#)
(1) ALU RRH2x40-AWS (44#)
(1) ALU RRH2x60—1900A-4R (46#)
Beta
(1) Powerwave 7750 Panel Antenna (39#)
(1) CCI HPA45R-BUU-H4 Panel Antenna (64#)
(1) Powerwave P45-16-XLH-RR (53#)
(1) Powerwave CM1007-DBPXBC-003 Diplexer (3#)
(1) Powerwave TT19-08BP111-001 TMA (22#)
(1) ALU RRH2x40W-07L (52#)
(1) ALU RRH2x40-AWS (44#)
(1) ALU RRH2x60—1900A-4R (46#)
ISE, Incorporated
Structural Engineers Telecommunications & Industrial Design
PO Box 50039 Phoenix, Arizona 85076 Office: (602) 403-8614 Fax: (623) 321-1283 www.ISE-INC.biz
6
Gamma
(1) Powerwave 7750 Panel Antenna (39#)
(1) CCI HPA45R-BUU-H4 Panel Antenna (64#)
(1) Powerwave P45-16-XLH-RR (53#)
(1) Powerwave CM1007-DBPXBC-003 Diplexer (3#)
(1) Powerwave TT19-08BP111-001 TMA (22#)
(1) ALU RRH2x40W-07L (52#)
(1) ALU RRH2x40-AWS (44#)
(1) ALU RRH2x60—1900A-4R (46#)
Existing equipment weight total = 928#
Proposed equipment weight total = 1066#
Total weight increase = (1066 – 928)/928 = 14.9%
The proposed equipment weight is within 15% of the existing equipment dead load. By
inspection, the existing mount frame has adequate capacity for the proposed equipment
loading.
The proposed antennas and equipment will be mounted entirely within the existing screen
structure, and will not contribute any additional wind area to the design wind loading
scenarios. The existing antenna support structures and building structure have adequate
capacity for the proposed equipment loading.
CONCLUSION AND RECOMMENDATIONS:
On the basis of our analytical and comparative engineering evaluation we find that the
existing building and antenna support structures have adequate capacity for the proposed
AT&T antenna and equipment configurations under TIA-222-G load conditions. This
analysis assumes that the existing structures are in adequate condition to carry their full
design capacity.
We are pleased to have been of service for this project. If you have any questions
regarding this report please feel free to give us a call.