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Hurricane Shutter Systems, Inc. of Florida

DID YOU KNOW?


About Wind Velocity and Pressures

There are conversion algebraic "approximations" only. You can be off by quite a margin depending on the velocity that is considered.

Exact solutions from fastest mile to 3 second gusts are an iterative process using the Durst Curve which is contained in the ASCE 7-02 page 296. The iteration closes fairly quickly (about 3 or 4 cycles).

Various winds to 3 second gusts have been converted to Fujita Scale, Saffir Simpson Scale, Australian Cyclonic Scale. Beaufort Scale, World Meteorological Organization velocities, and Fastest Mile winds to 3 Second Gusts.

It is important to get the velocities correct because the pressures vary as a ratio of the velocities squared. A little mistake in velocity can be a huge mistake in pressure.

Example:

A Cat 3 hurricane is 1.5 times greater in velocity than a Cat 1.
But a Cat 3 pressure is 2.25 times greater than a Cat 1.

By: Dr. Harold Sprague


Test Results Chart:

Equivalent Basic Wind Speeds (FBC 1606.1 & IBC 1609.3.1)
ASCE 7-98 3 Sec. Gust (FBC 2001, IBC 2000) ASCE 7-93 Fastest Mile (10 Min Avg.) / BOCA
Velocity Pressure Remarks Velocity Pressure Remarks
85 11.6   70 15.9  
90 14.2   75 18.3  
100 15.5   80 20.8  
105 17   85 23.5  
110 18.7   90 26.3  
120 22.3   92 27.6  
125 24.2   100 32.5  
130 26.1   105 35.8  
134 27.6   110 39.3  
140 30.3   120 45.6  
145 32.5   125 50.7  
150 34.8   130 54.9  
234 85.0 Failure Velocity Pressure 162 85.0 Failure Velocity Pressure

 



 


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