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RE: Hurricane Wind Speeds

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You have to take into account the return period. They took a period of 500
years, but finagled the contours by taking into consideration "effective
load" and importance factors, etc. The goal was to make it less cumbersome,
not have to juggle a bunch of different factors.

Recall also that the wind-speeds given for actual hurricanes are "maximum
sustained winds" and occur near the eye. The wind-speeds tend to fall off
dramatically as you move away from the eye. So statistically speaking,
unless you get beaned dead-on by a Cat 5 storm, the 120 MPH value will
probably get you through almost anything else.

> -----Original Message-----
> From: Rand Holtham, P.E. [mailto:rand(--nospam--at)]
> Sent: Wednesday, September 01, 2004 4:12 PM
> To: seaint(--nospam--at)
> Subject: Re: Hurricane Wind Speeds
> Average over 60sec look in the commentary in ASCE 7 for correlation
> between
> the various wind durations. In the '95 version it's Fig6-1. I was
> surprised
> that the 120mph (3sec) I design for is only a Cat1-Cat2 hurricane.

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