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# Re: Wind Speeds for design wind pressures

• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: Wind Speeds for design wind pressures
• From: "Michael Donoghue" <cmd(--nospam--at)ibm.net>
• Date: Mon, 20 Jul 1998 13:38:32 -0500

```There is also a discussion and example in the USACE's "Shore
Protection Manual" (1984 still).

cmd
-----Original Message-----
From: Harold Sprague <hsprague(--nospam--at)aspen.klaalov.com>
To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
Date: 20 July, 1998 11:01 AM
Subject: RE: Wind Speeds for design wind pressures

You have 2 different problems.

I do not know why you would convert a 3 second gust to a 60 minute
wind, but the commentary of the ASCE 7-95 contains the Durst curve and
the Krayer-Marshall curve for a direct conversion.  I have done
conversions to and from 60 second winds (Saffir-Simpson hurricane
winds) and 10 minute winds (WMO standard extreme winds), but never to
a 60 minute wind.

The conversion from 3 second to a fastest mile wind is an iterative
solution, and can also be done using the ASCE 7 commentary, but it is
a bit tricky.  The Structural Engineering Institute's newsletter
contained an example by Jim Rossberg of this iterative procedure.

I would be a bit wary of the API standard.  Rely more on the ASCE 7
for wind load development.

Harold Sprague, PE
Krawinkler, Luth & Assoc.

-----Original Message-----
From: Allan Hickey [SMTP:ahickey(--nospam--at)hotkey.net.au]
Sent: Monday, July 20, 1998 6:46 AM
To: Seaint@Seaint. Org
Subject: Wind Speeds for design wind pressures

Can any one advise of a conversion for the equivalent 3 second gust
wind
velocity to a specified 60 minute or fastest mile wind velocity. This
is to
convert an API code provision to Australian conditions where we design
to
shorter duration gust loads which are obviously statistically a
slightly
higher number.
Thank you
Allan Hickey, Brisbane, Australia

```