With permission from ASCE: b of ASCE 7-10 Figure 26.5.1B Title: Basic Wind Speeds for Risk Category III&IV Buildings at Exposure C at 33 ft. Below is an example of a basic wind speed map for Categories III and IV. The International Building Code and the ASCE 7-10 both publish contour basic wind speed maps by risk category. The higher the basic wind speeds, the higher the designed wind loads need to be for that particular structure.
The higher the risk category, the higher the basic wind speeds. The highest risk category, Risk IV, includes highly populated buildings that would require a full-scale evacuation like hospitals. Risk I, the lowest risk category, includes unoccupied buildings like silos or barns. Basic wind speeds are further broken down into one of four possible risk categories dealing primarily with intended use and capacity. The first, and most important parameter, in determining wind loads of structures is basic wind speed. So, hurricane-prone regions, like Florida, have additional requirements, but all designers are required to determine the required safety measurements for their walls, roofs and cladding. The first five parameters are completely dependent on the geographic location of the structure, but the last two parameters are specific to the structural design itself.
Many people think wind loads are just precautionary measures in hurricane-ridden areas, but the truth is that wind loads are defined in all buildings and in all geographical areas. The parameters used to determine wind loads are: Wind loads relate to the amount of pressure exerted on any given zone of a building and its components. Wind Loads and How the Building Code Addresses Them We are excited to share our knowledge of the building code, the general requirements of wind loads for buildings and information on how wind loads affect every component of commercial and residential buildings. There can be uplift wind load (affects roof/horizontal structures), shear wind load (horizontal pressure that can damage walls) and lateral wind load (can cause foundational issues). It helps maintain the safety of all building tenants and contributes to the operational functionality of the building over its lifetime.īut what exactly is wind load, and why is it important? Wind load is essentially the wind pressure or wind force, in pounds per square foot, exerted on a building. For architects and builders-especially those in hurricane-prone areas -creating projects that meet or exceed wind load codes is incredibly important.
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