Definition of Wind Profiles in ASCE 7

Abstract

One of the major changes in the recent versions of ASCE 7 concerns the introduction of three-second gust as the reference wind speed. The three-second gust speed is derived using Durst’s model in terms of the mean wind speed and turbulence intensity given in the former versions of ASCE 7. A review of these profiles suggests a notable inconsistency in the embedded relationship among the wind profiles in ASCE 7-98, which is also apparent when these are compared to the profiles in major international codes and standards. To overcome this inconsistency in the definition of wind profiles, this paper proposes a modified turbulence intensity profile and suggests retaining the current mean wind and gust speed profiles. This modification not only ensures consistency in the definition of wind profiles in ASCE 7-98, but also renders the definition of these profiles consistent with those in major international codes and standards.