HomeMy WebLinkAboutDESIGN LOADS - 22-00502 - Mountain West Rental and SalesPage 1 of 2
June 5, 2022
Mountain West Rental & Sales
374 North 850 West
Blackfoot, ID 83221
Re: Job No.: 9144-28233
Harper Crane
165 Airport Rd
Rexburg, ID 83440
USA
WRF 80’-0” W x 54’-0” L x 14’-0” EH Roof Slope 2.0:12 (Building A)
WRF 80’-0” W x 176’-0” L x 34’-0” EH Roof Slope 2.0:12 (Building B)
To whom it may concern:
In our professional opinion, the above referenced buildings have been designed to sustain no
less than the requested design loads as listed on the order documents, applied per the
2018 International Building Code specifically as follows:
Risk Category II - Normal
Dead Load Metal Building Only
Collateral Load 3.0 psf Lights, Insulation
Roof Live Load 20.0 psf Non-Reducible
Ground Snow Load 50.0 psf Importance Factor Is = 1.0 Exposure = 1.00
Roof Snow Load 35.0 psf Thermal Factor Ct = 1.0 Slope Factor Cs = 1.00
Wind Speed Vult (3-sec gust) 115 mph Exposure = C
Wind Speed Vasd 89 mph
Serviceability Wind Speed 75 mph
Internal Pressure Coefficient ±0.18 (Building A); ±0.18 (Building B)
Wind design is based on an Enclosed building. All building envelope accessories (windows,
doors, etc.) not provided by the metal building fabricator must be designed to sustain no less
than the same wind criteria as the building.
For components, cladding, and MWFRS, deflections involving wind are based on 10-year
serviceability wind pressures.
Seismic Importance Factor Ie = 1.00
Spectral Response Acceleration, Ss = 0.3646 Design Spectral Response, SDS = 0.3661
Spectral Response Acceleration, S1 = 0.1419 Design Spectral Response, SD1 = 0.2179
Seismic Design Category = D Site Class = D
Seismic Response Coefficient, Cs = 0.1127 Design Base Shear, V = 40.40 kips
Page 2 of 2
Seismic Force-Resisting System
Framing Direction: Lateral Longitudinal
Structural System: C4 B3
Response Modification Factor 3.50 3.25
Seismic Response Coefficient Cs 0.1127 0.1127
Design Base Shear V (kips) 9.90 - A 8.00 - A
40.40 – B 26.10 - B
Analysis Procedure Equivalent Lateral Force
Basic Structural System (from ASCE 7-10 Table 12.2-1)
C4: Ordinary Steel Moment Frames
B3: Steel Ordinary Concentrically Braced Frames
Other Loads:
- 5 Ton Top Running Crane
- Drift snow has been added in accordance with the building code as follows:
0.00 psf to 106.7 psf Drift Snow 20.8 ft width at REW/Line 3
Design is in accordance with the AISI S100-16 North American Specification for the Design
of Cold-Formed Steel Structural Members, the AISC 360-16 Specification for Structural
Steel Buildings, the AWS D1.1-2020 Structural Welding Code - Steel, the AWS D1.3-2018
Structural Welding Code - Sheet Steel, and generally accepted engineering practices.
The engineer whose seal and signature appears on these documents represents Whirlwind Steel
Buildings, Inc and is not the Engineer of Record (EOR) for the overall construction project. It is
expressly noted that this letter of professional opinion includes only the steel building as designed
and furnished by Whirlwind Steel Buildings, Inc. and specifically excludes all accessories, anchor
rods, foundation, masonry, general contract work, or any field modifications deviating from the
Whirlwind construction documents.
Sincerely,
Fred Radfar, PE
06/14/2022