20-104673-Structural Analysis Report-01-20-2021-V1
PAGE 1 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
Structural Analysis Report
Structure : Roof Top
Engineering Number : 20-SLG-005
Proposed Carrier : AT&T
Carrier Site Name : WEYERHAEUSER
Carrier Site Number : SS81
Site Location : 33940 WEYERHAEUSER WAY S
FEDERAL WAY, WA 98001
47.2969400, -122.2897200
: City of FEDERAL WAY
Date : November 5, 2020
Max Usage : 22%
Result : Pass
Prepared By: Reviewed by:
Andrei Cocosila Florin Arsene. S.E.
Structural Engineer Washington #:SE 39177
PAGE 2 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
Table of Contents
1 Supporting Documents ................................................................................................................... 4
2 Analysis .......................................................................................................................................... 4
3 Conclusion ...................................................................................................................................... 4
4 Proposed / Existing Equipment ...................................................................................................... 5
5 Structure Usages ............................................................................................................................ 5
6 Calculations .................................................................................................................................... 6
7 Proposed Equipment inside existing Cabinets ............................................................................. 10
RISA 3D PRINTOUT ........................................................................................................................... 11
PAGE 3 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
To Whom It May Concern,
Distributed Engineering Inc. is pleased to submit this analysis to determine the structural
integrity of the above mentioned structure.
This analysis has been performed in compliance with the 2018 International Building Code,
ASCE 7-16 Minimum Design Loads for Buildings and Other Structures, ANSI/TIA -222-H Structural
Standard to determine the structural integrity of the antenna mounts with the addition of the
following proposed loading configuratio n:
Analysis Results
Existing supporting structure 22.0% Adequate
5/8” diameter A 307 U-Bolt (connection) 11.95% Adequate
We at Distributed Engineering Inc. appreciate the opportunity of providing continued specialty
services. Please do not hesitate to contact our office if you have any questions.
PAGE 4 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
1 Supporting Documents
Company Document Type Reference Date
Salaga Design Construction Drawings Site Number:
SS81
October 06,
2020
CLS Group by GeoStructural Structural Analysis
Report
Site Number:
SS81
April 12,
2018
2 Analysis
The analysis was carried out with a RISA 3D, a commercial analysis software.
Codes and Standards
Building Code 2018 International Building Code
ASCE Standard ASCE 7-16
TIA Standard ANSI/TIA-222-H
Wind Parameters
Basic Wind Speed 97 mph
Basic Wind Speed with Ice No Ice Considered
Structure Class II
Exposure Category C
Topographic Category 1
Crest Height 0 ft
Seismic Parameters
SS 1.303
S1 0.447
Site Class D - Stiff Soil
3 Conclusion
The existing supporting structure is adequate to support the new equipment in accordance with
2018 International Building Code.
PAGE 5 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
4 Proposed / Existing Equipment
Antenna
Elevation
(ft)
Description
Carrier Azimuth
(Deg)
Lines
Status
55 (3) NNH4-65B-R6 AT&T 55/230/330 fiber Existing
55 (3) RRH 4T4R B12/14 320W AHLBA AT&T - fiber Existing
55 (3) RRH 4T4R B25/66 320W AHFIB AT&T - fiber Existing
55 (3) SBNHH-1D65B AT&T 55/230/330 fiber Existing
55 (3) RRH4x25-WCS-4R AT&T - fiber Existing
55 (3) NNHH-65B-R4 AT&T 55/230/330 fiber Proposed
55 (3) 4T4R B5 AHCA AT&T - fiber Proposed
55 (3) 742-264 AT&T 55/230/330 fiber Existing
55 (6) LGP 21401 AT&T - fiber Existing
55 (6) DC2-48-60-0-9E AT&T - fiber Existing
55 (2) FC12-PC6-10E AT&T - Fiber Existing
5 Structure Usages
Structural
Component
Controlling
Usage
Pass/Fail
2” Std. Pipe 22.0% Pass
5/8” diameter A307 U-bolt (Connection) 11.95% Pass
PAGE 6 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
6 Calculations
6.1 Equipment Seismic Loadings
The seismic coefficients are in accordance with ASCE 7-16 code (Table 13.6-1 Seismic Coefficients
for Mechanical and Electrical Components).
The seismic force design for each component is determined in accordance with ASCE 7 -16 code
(Eq. 13.3-1).
𝐸𝑝=0.4𝛼𝑝𝑅𝐷𝑆𝑉𝑝
(𝑅𝑝
𝐼𝑝
)
(1 +2 𝑧
ℎ)
αp 1.0 [-]
Rp 1.5 [-]
Ip 1.0 [-]
Seismic coefficients
Wp z h Fp,min Fp, max Fp
[lbs][feet][feet][lbs][lbs][lbs]
Commoscope NNH4-65B-R4 (P)78.5 55 55 20.5 109.1 54.6
RRH 4T4R B5 160W AHCA (P)36.8 55 55 9.6 51.1 25.6
Element
PAGE 7 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
6.2 Equipment Wind Loadings
6.2.1 Velocity Pressure
The wind loads are determined using the definition of the TIA–222–H Standard from the chapter 2.6.
The basic wind speed V =97 mph, corresponding to Risk Category II.
We consider the wind directionality factor 𝐾𝑑 equal to 0.95 (see EIA-222-H, Section 16.6).
The velocity pressure exposure coefficient 𝐾𝑧 is determined for the exposure type C:
𝛼=9.5 𝑧𝑔=900 𝑓𝑡
𝐾𝑧=2.01 (𝑧
𝑧𝑔
)
2
𝛼
=2.01 (55
900)
2
9.5
=1.116
There are no topography features: 𝐾𝑧𝑠=1
The ground elevation coefficient Ke = 1 that is permitted for any ground elevation (see EIA-222-H,
Section 2.6.8)
Roof wind speed-up factor Ks = 1
The velocity pressure, 𝑞𝑧, is evaluated at the height of the rooftop, using the equation of the chapter
2.6.11.6 of EIA-222-H:
𝑞𝑧=0.00256𝐾𝑧𝐾𝑧𝑠𝐾𝑑𝐾𝑑𝐾𝑠𝑉2 =25.54 𝑙𝑏
𝑓𝑡2
6.2.2 Proposed Elements
To evaluate the lateral force on the equipment, we consider a gust effect factor, 𝐸ℎ=1.0
The wind force is determined using the equation of the chapter 2.6.9.2: 𝐸𝐴=𝑞𝑧𝐸ℎ𝐾𝑎(𝐸𝑃𝐴)𝐴
𝐾𝑎=0.9
qh Gh B H Ca EPA Ka FA
[lbs/ft2][-][ft][ft][-][ft2][-][lbs]
CMA-UBTULBULBH H-6516-16-21-21 (P)25.54 1 1.63 6.00 1.40 13.7 0.9 314.7
RRH 4T4R B5 160W AHCA (P)25.54 1 0.97 1.11 2.00 2.2 0.9 49.5
Element
PAGE 8 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
6.3 ANTENNA MOUNT ASSESSMENT
6.3.1 Antenna Mount Construction
The proposed antennas and RRH will be installed on existing 2” diameter standard vertical pipes, 6’
long.
6.3.2 Load Combinations
The most onerous load combination is the wind load combination: 1.2D+1.0W. Since this an
individual wall mounted structure, there are no maintenance load combinations.
6.3.3 Element Check
We modeled the structure in RISA 3D software:
In this configuration, the 2” diameter standard pipe is loaded up to 22% of its capacity.
PAGE 9 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
The mount frame OK.
6.3.4 Connection Check
We assume the mounting pipe is connected with L2- ½”x2- ½”x 1/4” single angle brace using (1)
5/8” diameter A307 U-bolt.
The maximum shear force is 314 lbs.
The maximum tensile force is 1237 lbs.
The design shear resistance force for (1) 5/8” diameter A307 grade U-Bolt is 6.21 k.
The design tensile resistance force for (1) 5/8” diameter A307 grade U-Bolt is 10.35 k.
Connection Bolts OK.
PAGE 10 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
7 Proposed Equipment inside existing Cabinets
The proposed (1) ASIK and (1) ABIL will be installed in existing Purcell Cabinet.
The proposed (3) 25 AMP breakers and (2) rectifiers will be installed in existing Power Cabinet.
The additional equipment is very light, and the cabinet is usually designed to the maximum load
capacity.
PAGE 11 OF 11
CALCULATION SHEET
Project 20-SLG-005 Site Location FEDERAL WAY
Subject STRUCTURAL ANALYSIS OF AT&T SITE SS81
REV ORIGINATOR DATE REVIEWER DATE REV ORIGINATOR DATE REVIEWER DATE
0 I.MICUT 10/20/2020 F. ARSENE 10/20/2020
1 A. COCOSILA 11/05/2020 F. ARSENE 11/05/2020
DISTRIBUTED ENGINEERING INC
RISA 3D PRINTOUT
Distributed Engineering
AC
20-SLG-005
SS81 SK-1
Nov 05, 2020 at 04:11 PM
Antenna Mount Structure -Rev.1.…
Distributed Engineering
AC
20-SLG-005
SS81 SK-2
Nov 05, 2020 at 04:14 PM
Antenna Mount Structure -Rev.1.…
Company
Designer
Job Number
Model Name
:
:
:
:
Distributed Engineering
AC
20-SLG-005
SS81
Checked By : FA
11/5/2020
4:16:01 PM
RISA-3D.NET version 18.0.0.35935 [ Antenna Mount Structure -Rev.1.r3d ]Page 1
Nodes
Label X [ft]Y [ft]Z [ft]Temp [deg F]Detach From Dia…
1 N1 0 -0.25 -0.5
2 N7 0 1.75 -0.5
3 N21 0 -1.25 0
4 N22 0 4.75 0
5 N5 0 -0.25 0
6 N6 0 1.75 0
Boundary Conditions
Node Label X [k/in]Y [k/in]Z [k/in]X Rot [k-ft/rad]Y Rot [k-ft/rad]Z Rot [k-ft/rad]
1 N1 Reaction Reaction Reaction
2 N21 Reaction
3 N7 Reaction Reaction Reaction
Primary Member Properties
Label I Node J Node K Node Rotate(deg)Section/S…Type Design List Material Design R…
1 M3 N22 N21 PIPE_2.0 Column Pipe A500 Gr.…Typical
2 M2 N6 N7 RIGID None None RIGID Typical
3 M4 N5 N1 RIGID None None RIGID Typical
Basic Load Cases
BLC Des…Category X Gravity Y Gravity Z Gravity Nodal Point Distributed Area(Me…Surface(…
1 Dead Load None -1 2
2 Wind Load None 2
Load Combinations
De…So…P…S…BLC Fa…BLC Fa…BLC Fa…BLC Fa…BLC Fa…BLC Fa…BLC Fa…BLC Fa…BLC Fa…BLC Fa…
1 1.…Yes Y 1 1.2 2 1
Load Combination Design
Descrip…ASIF Service Hot Roll…Cold Fo…Wood Concrete Masonry Aluminum Stainless Connec…
1 1.2D+1.…Yes Yes Yes Yes Yes Yes Yes Yes
Node Reactions
LC Node Label X [k]Y [k]Z [k]MX [k-ft]MY [k-ft]MZ [k-ft]
1 1 N1 0 -0.558 0.03 0 0 0
2 1 N21 0 0 0 0 0 0
3 1 N7 0 0.679 0.284 0 0 0
4 1 Totals:0 0.121 0.314
5 1 COG (ft):X: 0 Y: 1.75 Z: 0
Node Deflections
LC Node Label X [in]Y [in]Z [in]X Rotation [r…Y Rotation [r…Z Rotation [r…
1 1 N1 0 0 0 -3.889e-04 0 0
2 1 N7 0 0 0 -4.926e-04 0 0
3 1 N21 0 0.002 -0.002 3.882e-04 0 0
4 1 N22 0 0.003 -0.187 -7.499e-03 0 0
5 1 N5 0 0.002 0 -3.889e-04 0 0
6 1 N6 0 0.003 0 -4.926e-04 0 0
LRFD
LC Member Shape UC Max Loc [ft]Shear…Loc [ft]Dir phi*P…phi*P…phi*M…phi*M…Cb Eqn
1 1 M3 PIPE_…0.218 3 0.014 3 22.969 38.556 2.246 2.246 1 H1-1b