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RE: Rho factor for wind and gravity loads?
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- Subject: RE: Rho factor for wind and gravity loads?
- From: "Polhemus, Bill" <BPolhemus(--nospam--at)wje.com>
- Date: Wed, 26 Jul 2006 10:20:27 -0500
From: Steve Mickelson
[mailto:smickelson(--nospam--at)northstareng.com] My question is this . . . why is there not a rho factor for
wind forces or gravity loads? Because they are considered “static
loads” and the approach is to RESIST the loads primarily in the elastic
range—even for extreme events. For example, here in We design structural elements,
connections, etc., assuming we will fully resist such forces; that when such an
event occurs, the structure will maintain its full ability to resist loads—we
could even have TWO such events occurring fairly close together, and the structure
would be expected to resist all such forces connected with the events. That is not the case with seismic events;
the structures are expected to resist the forces in that case, well into the
plastic range, sufficient to maintain the desired degree of integrity—but
not necessarily to remain unaffected. Bulldozers will be arriving sometime
thereafter (at least in some cases). Redundancy is another way of saying “overall
system ductility.” |
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