Buildings are also classified by their response to wind (Types 1 to 4), ranging from rigid structures to those highly sensitive to dynamic effects. Calculating Design Wind Speed ( VDcap V sub cap D )
The "Isotacas" (wind speed maps) now use a 50-year return period with increased regional velocities based on more recent meteorological records.
Structures are categorized into four groups ( A+, A, B, C ) based on their importance and the risk associated with their failure (e.g., nuclear plants vs. temporary sheds). manual de dise%C3%B1o por viento cfe 2020 pdf capo
(Topographic Factor): Adjusts for local terrain features like hills or cliffs. FAcap F sub cap A
The primary goal of the CFE 2020 manual is to establish uniform criteria for calculating wind loads on structures across Mexico, a country with diverse wind climates including hurricane-prone coasts and high-altitude plateaus. Unlike many local building codes that are city-specific, the CFE manual offers a national standard often adopted by municipalities that lack their own specialized regulations. Buildings are also classified by their response to
(Regional Velocity): The maximum probable wind speed for a specific zone, typically measured as a 3-second gust at 10 meters height. FTcap F sub cap T
(Exposure/Size Factor): Accounts for terrain roughness (e.g., urban vs. open sea) and the height of the structure. Sistema Viento | Gerencia de Ingeniería Civil temporary sheds)
New values for mean annual minimum temperatures significantly impact air density calculations, resulting in more accurate (and often higher) design wind speeds.