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Quickly retrieve site structural design parameters specified by ASCE 7-10, ASCE 7-16, and ASCE 7-20, including wind, seismic, snow, ice, rain, flood, tsunami, and tornado.
Exposure B as defined in the WFCM and ASCE7-10 is as follows: “Urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of singe family dwellings or larger.”
Learn how to calculate ASCE 7 Exposure D with illustrations & descriptions of other wind exposure categories.
While the wind speed maps in ASCE 7-16 have been revised significantly for the nonhurricane-prone region, for the State of Florida, the only significant change to the wind speed maps is the introduction of a new wind speed map for Risk Category IV buildings and structures. Wind speeds for Risk Category I, II, and III buildings are unchanged ...
Exposure Category. We can determine the exposure category based on ground surface topography, vegetation, and built structures. In ASCE 7-16 (section 26.7), the following exposure categories can apply in wind load calculations: Exposure B - Urban/wooded areas with many obstructions; Exposure C - Open terrain with scattered obstructions
In current versions of ASCE 7, Risk Category is now determined by altering the wind velocity that goes into the wind velocity to pressure calculation to determine a design force. This article explores those risk categories and how they are used in design.
The basic wind speed maps in ASCE 7-22 have been revised primarily in hurricane-prone regions. These changes are the result of ongoing improvements to the hurricane simulation model that is used to develop the wind speeds in hurricane-prone regions. The changes also include better wind speed estimates in the areas where hurricane wind speeds ...
Local wind speed maps at the county level can be found at: https://adhoc.geoplan.ufl.edu/downloads/kate/windsp eed_2023/Preliminary_County_PDFs_Draft_20230322/ These maps were developed by the University of Florida and include the V ult design wind speed maps for all 67 counties for Risk Categories I, II, III, and IV.
Exposure Category is the parameter that quantifies the effects that the surroundings (such as natural topography, vegetation, and constructed facilities) have on the wind pressure on a structure. Simply stated, Exposure Category tells us how “open” the surroundings of a structure are, and how it directly affects the wind pressure.
There are some noteworthy differences between the three ASCE 7 editions and they include: the wind speed maps, roof zones, enclosure classifications, external pressure coefficients, and the equation to calculate velocity pressures.