HomeMy WebLinkAboutEngineering Letter Station #8 Ft PierceLPM TECHNICAL SERVICES, INC.
162 Rainbow Street, Merritt Island, FL 32952
Engineering Business Registry 33134
LPMTS-20-002
June 24, 2020
Mr. Tarik Dalak
Overhead Door of America/Door Master Services, Inc.:
3802 N. Cocoa Blvd
Cocoa, FL 32926
RE: Florida Building Code Overhead Door Wind Load Design Pressure for St. Lucie County Fire District
- Station 8
LPM Technical Services Inc. (LPMTS) was tasked by Overhead Door of America to provide wind pressures for
the above referenced facility located at 7583 S Ocean Dr Jensen Beach, FL 34957. Our effort is limited to
provide wind pressures and further Structural design and analysis are beyond this scope.
The following information regarding the existing building and overhead door to be used was provided via as -
built (legacy) plans and Overhead Door of America/Door Master Services, Inc.:
1. Building Length = 63.00 feet (high bay is treated as its own building for wind purposes only)
2. Building Width = 48.00 feet (high bay is treated as its own building for wind purposes only)
3. Roof Type = Gable
4. Soffit overhang = None
5. Ridge Length = 63.00 feet
6. Ridge Height = 23 feet (assumed)
7. Eave Height = 14 feet (assumed)
8. Door Opening Dimensions = 12 feet (H) x 12 feet (W)
9. Door model to be used: Clopay 524
10. Approval Number: 16848.4 (Dade listed NOA 19-0124.02)
11. Drawing Number: 104813
12. Wind Load Capacity: +52/-58 psf (see signed and sealed drawing Number 104813)
The following wind load parameters were used to calculate the wind:
1. Ultimate Windspeed = 173 MPH (3 -sec gust. Source: Attached St. Lucie County Ultimate Design
Wind Speed Maps for Risk Category III and IV.)
2. Risk Category = IV (essential facility — Fire Station)
3. Exposure = D
4. Building Enclosure = Enclosed
5. GCPi = +/-0.18 (Ref ASCE 7, Table 26.11-1 for Enclosed Building)
The wind pressures for components and cladding were calculated in accordance with ASCE 7-10 Allowable
Strength Design (ASD). For the subject building, Zone 5 region is defined for buildings with height (h) is less
than or equal to 60', width 'a' for Zone 5 is equal to 10% of least horizontal dimension or 0.4*h, whichever is
smaller, but not less than either 4% of least horizontal dimension or 3'. Therefore, width of zone 5 is 10% of the
minimum building dimension, or 6.4 ft. Since the garage door opening is located 4'- 0" from the corner, this
means that 2.4 ft., (20%) of the door is within Zone 5, and 9.6 ft. (80%) of the door is within Zone 4.
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The following table summarizes the wind pressures:
Components and Cladding Wind Pressures ASD Do No Factor Down
Effective Area SQ FTZone
4 + s
Zone 4 -) (psf) Zone 5 + s
Zone 5 - sf
12*10 = 120
1 42.9
-47.2 42.9
-52
Width of Lone 5 (Lnd Zones), A = bA tt)
Based on these calculated wind pressures, the above listed Clopay Corporation Doors meet the
requirements for the stated loads.
The design loads shown above are based upon the measurements listed above for "enclosed" buildings, and
require that the door being installed meets the requirements of Section 1626 of the 6th Ed Florida Building
Code (2017) for windborne debris in high velocity hurricane zones. Design Loads are in accordance with
Allowable Stress Design load combinations. Further load reduction IS NOT permitted.
The information provided is assumed to be accurate about the building. Any incorrect information makes this
letter void and until such time that corrected information is provided can be reassessed.
Feel free to contact us with any questions.
Sincerely,
Lutfi Mized, PE
Florida P.E. License No.
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