Background Information
This example demonstrates wind load calculations for a barn designed to store agricultural goods in Bernardsville, New Jersey. The calculations follow the Envelope Procedure in ASCE 7-16, determining the wind pressures acting on the barnâs walls and roof for Main Wind-Force Resisting Systems (MWFRS) using the Wind Loads (ASCE 7-16) calculator. The barn is located on a flat, open, and isolated site. Its building footprint measures 24 ft by 40 ft (7.32 m by 12.19 m), with a gable roof pitched at 9:12. The eave height is 12 ft (3.66 m), and the total height from the ground to the ridge is 21 ft (6.4 m). This example is sourced from the McGraw Hill Textbook, Building Design for Wind Forces, 1st Edition, authored by Rima Taher, Ph.D., P.E., and can be found on AccessEngineering.Project Defaults
In the Project Defaults section, you can enable the Override Project Defaults option by selecting Yes to manually enter the Basic Wind Speed for your project. Otherwise, our system will automatically calculate the Basic Wind Speed based on the projectâs address and risk category, if these details are provided. For this example, Agricultural buildings fall under Risk Category I. We will manually input the Basic Wind Speed since the exact location is unavailable. The Basic Wind Speed is set to 105 mph, based on the ASCE 7-16 wind speed map for Risk Category I. In this example, we will analyze the MWFRS (Main Wind-Force Resisting System) using the Envelope Method, so we will select this option in the calculator. The Exposure Category is C (open terrain with scattered obstructions).Building properties:
In the Building Properties section, you can enter the dimensions for this example. You can find these details in the image below.- Roof Type: Gable
- Roof Pitch: 9:12
- Roof Top Height: 21 ft (6.4 m)
- Footprint Dimensions: Width 24 ft by Length, 40 ft (7.32 m by 12.19 m)
Wind Load Parameters
Once youâve entered the inputs mentioned, youâll be able to view the Wind Load Parameters. These parameters are automatically calculated based on the information provided, ensuring accurate and code-compliant results for your project.- Perpendicular Pressure Coefficients for wind loads acting perpendicular to the ridge (Load Case A).
- Parallel Pressure Coefficients for wind loads acting parallel to the ridge (Load Case B).