HomeMy WebLinkAboutEngineer's Letter 07.09.2020HERITAGE
BUILDING SYSTEMS:,
Established 1979
A Cornerstone Building Brands Company
July 09, 2020
TRIDENT STEEL
3002 NORTH 1-70 FRONTAGE ROAD
GRAND JUNCTION, CO 81504
17-B-69333
TRIDENT STEEL
160 GEMAT CIRCLE
RIFLE,CO 81650 US
60'-0" x 80'-0" x 16'-0"
To Whom It May Concern:
This is to certify that materials for the subject structure have been designed in
accordance with the order documents, specifically as shown per the attached
Engineering Design Criteria Sheet.
Aspects of code compliance as related to use or occupancy, such as sprinkler
requirements, are not addressed by these documents.
These materials, when properly erected on an adequate foundation in accordance with
the erection drawings as supplied and using the components as furnished, will meet
the attached loading requirements.
This certification does not cover field modifications or the design of materials
not furnished by Heritage Building Systems.
The attached design criteria information is to remain with and form part of this
Letter of Certification.
The calculations and the metal building they represent are the product of Heritage
Building Systems or a division of its affiliate Cornerstone Building Brands. The
engineer whose seal appears hereon is employed by either Heritage Building Systems
or a division of its affiliate Cornerstone Building Brands and is not the engineer
of record for this project.
Cordially,
Heritage Building Systems
Materials for Metal Buildings
A Cornerstone Building Brands Company
Ke Hu, P.E.
Design Engineer
This document has been
digitally signed.
17-B-69333 Page 1 of 2
HERITAGE
BUILDING SYSTEMS:
Established 1979
A Cornerstone Building Brands Company
Building Code IBC 15
Risk Category II - Normal
Roof Dead Load
Superimposed 2 150 psf
Collateral 1 000 psf (Total)
(0.00 psf Ceiling, 1 psf Other)
Roof Live Load 20.00 psf Yes reduction
Snow
Ground Snow Load (Pg) 57.00 psf
Snow Load Importance Factor (Is) 1.00
Snow Exposure Factor (Ce) 1.00
Thermal Factor (Ct) 1.00
Flat Roof Snow Load (Pf) 40.00 psf
Minimum Roof Snow Load (Pm) 40.00 psf
Wind
Ultimate Wind Speed (Vult) 115 mph
Nominal Wind Speed (Vasd) 89 mph (IBC Section 1609.3.1)
Serviceability Wind Speed 76 mph
Wind Exposure Category C
Internal Pressure Coef (GCpi) 0.18/-0.18
Loads for components not provided by building manufacturer
Wall Edge Zones 30.48 psf pressure -40.73 psf suction
Other Wall Zones 30.48 psf pressure -33.06 psf suction
These values are the maximum values required based on a 10 sq ft area.
Components with larger areas may have lower wind loads.
Seismic
Seismic Importance Factor (Ie) 1.00
Seismic Design Category B
Soil Site Class D
Ss 0.303 g Sds 0.315 g
S1 0.079 g Shc 0.126 g
Analysis Procedure Equivalent Lateral Force
Location...Int RF Front SW Back SW Left EW Right EW
System H H H H H
R 3 3 3 3 3
Cs 0.105 0.105 0.105 0.105 0.105
Design Base Shear in kips (V) Transverse 7.44 Longitudinal 7.40
Basic Structural System (from ASCE 7-10 Table 12.2-1)
System - Basic Force Resisting System
H - Steel System not Specifically Detailed for Seismic Resistance
R - Response Modification Coefficient
Cs - Seismic Response Coefficient
17-B-69333 Page 2 of 2