To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: ASCE 7 Wind Load Provisions
From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
Date: Wed, 11 Jul 2001 09:41:26 -0500
The critical change is from the UBC 97 to the ASCE 7-95. The extreme wind
velocity map in the UBC 97 are "fastest mile". The extreme wind velocity
maps in the ASCE 7-93 were also in "fastest mile". The extreme wind
velocities in the maps of both the ASCE 7-95 and ASCE 7-98 are in "3 second
gust" velocities (which is based on the National Weather Service).
The change from the ASCE 7-95 to ASCE 7-98 is not all that significant.
There was some reformatting, and they added a simplified procedure.
There are many more fundamental changes from the UBC 97 to the ASCE 7-95 and
include things such as:
* Cladding pressure calculations
* Escarpment effect
* Component pressure calculations
* Quartering wind effect
My suggestion is to just totally disregard UBC 97 and focus on ASCE 7-98
(which includes a pretty good commentary).
Harold O. Sprague
> -----Original Message-----
> From: Steven C. Devin, P.E. [SMTP:sdevin(--nospam--at)psln.com]
> Sent: Wednesday, July 11, 2001 9:21 AM
> To: seaint(--nospam--at)seaint.org
> Subject: ASCE 7 Wind Load Provisions
> I do most of my work in California (UBC land). However, I am interested
> getting up to speed on the wind load provisions of ASCE 7-98 for
> out-of-state work where the IBC has been adopted. I have a copy of ASCE
> 7-95 but have not yet purchased ASCE 7-98. ASCE published a book entitled
> something like "Guide to the Wind Load Provisions of ASCE 7-95". My
> question is: Have there been substantial changes to the wind load
> provisions between 7-95 and 7-98? Does anyone have any other suggestions
> for making the transition from UBC97 to IBC2000 wind load provisions?
> Steven C. Devin, P.E.
> Consulting Engineer
> Voice (530) 283 2553
> FAX (530) 283 2199
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