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Wind Exposure D[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Wind Exposure D
- From: "Ed Tornberg" <ed(--nospam--at)tornbergconsulting.com>
- Date: Fri, 18 Feb 2005 17:59:42 -0800
ASCE 7-02 18.104.22.168 says “Exposure D shall extend inland from the shoreline for a distance of 660 ft…”
IBC 2003 1609.4 says “Exposure D extends inland from the shoreline a distance of 1500 ft…”
1. There are other nuances, but why the big difference? I checked the errata. I think the IBC oops’d and carried over from the UBC
2. If the IBC references out ASCE 7 for wind load determination anyway (except simplified), why did they bother to repeat (and change) the exposures for everything?
As you may guess, I have a building between 660 ft and 1500 ft from the shoreline.
But it’s moot, because the surface roughness per ASCE is Surface Roughness B – there are houses and trees between the site and the beach. So Exposure D doesn’t govern anyway. Right?
Tornberg Consulting, LLC
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