This element provides probabilistic-based descriptions of extreme winds that can be expected to affect a building or structure during its lifetime. This element provides the link between characteristics of the oncoming wind and the corresponding pressures, forces and motion of the building or structure. When structural motions are sufficient to alter the wind forces, this interaction is referred to as aeroelasticity. Generally, it is not possible in a controlled testing environment to subject structures or components of structures to loads that duplicate the loads in an extreme wind event. Therefore, test methods that simulate or approximate actual loading conditions are required.
Revisions are necessary to keep pace with research findings and improved technology.
The effective reduction of wind hazards requires not only improved design and construction, but the development of procedures for strengthening existing buildings and models for predicting the effectiveness of such strengthening. The evaluation of structures and their components after having been exposed to extreme winds provides important feedback to the research community and to codes and standards bodies. Weak links are exposed and areas requiring additional research can be identified. In a continuing effort to document near-surface wind speeds in hurricanes and the resulting wind loads on structures, NIST is working closely with NOAA's Hurricane Research Division. Currently, NOAA and NIST are working to develop a joint program on improved understanding of the hurricane wind environment.