Wind Load

The force exerted by wind on a building or structure, calculated according to building code methods and used to design the structural system to resist lateral forces from wind events.

What is Wind Load?

Wind load is the lateral force that wind exerts on a building or structure. Building codes require that structures be designed to resist wind loads based on the expected wind speeds at the building site, the building's shape and height, the surrounding terrain, and the building's importance. Wind loads are a primary design consideration for the structural lateral force-resisting system, exterior cladding, roofing, and building components.

How Wind Loads Are Calculated

The IBC references ASCE 7 (Minimum Design Loads for Buildings and Other Structures) for wind load calculation methods. Key input parameters include the basic wind speed for the location (from ASCE 7 wind speed maps), exposure category (reflecting surrounding terrain roughness), wind directionality, topographic effects, and the building's shape and aerodynamic characteristics. Wind pressures vary across the building surface, with higher pressures at corners, edges, and the roof.

Wind Load in Different Regions

Wind load requirements vary dramatically by location. Coastal areas subject to hurricanes (Florida, the Gulf Coast, the Carolinas) have the highest design wind speeds, often requiring specialized structural systems, impact-resistant glazing, and enhanced connections. Interior areas generally have lower wind load requirements, though tornadoes can generate extreme localized winds.

Wind Load and Development

In high-wind regions, wind load requirements significantly affect building design and construction costs. Exterior cladding, window systems, and roofing must meet stringent wind resistance standards. For tall buildings, wind loads often govern the structural design even in moderate-wind areas, making wind engineering analysis a standard part of the design process.