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Wind Engineering: A Handbook for Structural Engineers by Henry Liu - University of Missouri—Columbia

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2Extreme Wind Probability

2.1 Introduction

Modern design of structures is based on the concept of probability. A structure is designed to provide a specific degree of safety against high winds, determined by the probability of occurrence of high winds with speeds exceeding the design value. For instance, the U.S. national standards on structural loads (ASCE 7–88, formerly ANSI A58.1) requires that ordinary structures be designed for an annual exceedance probability of 2% (equivalent to 50-year return period). The wind speed corresponding to such a probability for any location in the United States is given in Figure 7.1. For crucial facilities such as hospitals, they must be designed according to an exceedance probability of 1% (100-year return ...

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