Wind Climate and Failure Risks

by Emil Simiu, (M.ASCE), Struct. Research Engr.; Center for Building Tech., National Bureau of Standards, Washington, D.C.,

Serial Information: Journal of the Structural Division, 1976, Vol. 102, Issue 9, Pg. 1703-1707

Document Type: Journal Paper


The relation is examined between risk of failure, degree of wind sensitivity, type of wind climate, and mean recurrence interval used in design. The results presented are based on the assumption, used in the ANSI A58.1 Standard, that the probabilistic behavior of extreme wind speeds is adequately modeled by distribution functions of the largest values, the parameters of which are estimated from the data consisting of the largest yearly wind speed for every year of record. These results show that a strong correlation exists between probability of failure and type of wind climate, as defined quantitatively by the parameters of the extreme wind distribution. All other relevant factors being equal, including the degree of sensitivity to wind, it was found that the probability of failure of a member may increase considerably as a function of type of wind climate. It is suggested that the effect of the type of climate, as defined in the paper, be taken into account in design.

Subject Headings: Probability | Climates | Failure analysis | Wind loads | Wind speed | Probability distribution | Parameters (statistics) | Standards and codes

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