Relation Between Saffir-Simpson Hurricane Scale Wind Speeds and Peak 3-s Gust Speeds Over Open Terrain.
Relation Between Saffir-Simpson Hurricane Scale Wind
Speeds and Peak 3-s Gust Speeds Over Open Terrain.
Simiu, E.; Vickery, P.; Kareem, A.
Journal of Structural Engineering, Vol. 133, No. 7,
1043-1045, July 2007.
hurricanes; wind velocity; wind effects; structural
response; weather effects; exposure; equations; damage
The Saffir-Simpson scale for categorizing hurricane
intensity and damage potential is increasingly being
used by hurricane
forecasters and emergency managers. The hurricane
intensity categories are associated in the scale with
1-min wind speeds. For structural
engineering purposes the ASCE 7 Standard defines these
1-min speeds as speeds at 10 m over open water. This
technical note provides
estimates of the ratio of peak 3-s wind speeds at 10 m
over open-terrain exposure - the speeds used in the ASCE
7 wind map - to 1-min
speeds at 10 m above open water. Based on the ASCE 7
power-law model, the estimated ratio is 1.03. Based on
the logarithmic law
model, depending upon assumptions pertaining to the
surface roughness for flow over open water, and upon the
estimation method, the
ratio varies from 1.03 to 1.12.