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RE: ASCE 7-05 rho[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: ASCE 7-05 rho
- From: "Ehrlich, Gary" <gehrlich(--nospam--at)nahb.com>
- Date: Thu, 22 Mar 2007 09:55:53 -0400
The Notation section in Section 11.3 of ASCE 7-05, gives one definition of h as “height of a shear wall measured as the maximum clear height from top of foundation to bottom of diaphragm framing above, or the maximum clear height from top of diaphragm to bottom of diaphragm framing above.” So I’d interpret the h in h/l as wall stud or wall pier height, not story height. I also would apply the h/l > 1.0 to both shear walls and piers.
BTW, the ASCE 7 committee is meeting next week to start working on the 2010 update. If anyone has ideas for clarifications, send them to SEI. Or even post them for discussion here; I believe there are a number of committee members lurking about who will see them.
Gary J. Ehrlich, PE
Program Manager, Structural Codes & Standards
National Association of Home Builders (NAHB)
ph: 202-266-8545 or 800-368-5242 x8545
From: David Topete
My guess, since I don’t have a copy of ASCE 7-05 or 2006 IBC yet, is that if you remove one of 4 walls, it would result in a 33% reduction in strength. Less redundant system, hence higher value of rho = 1.3.
WRT story height, wouldn’t the height h be the story height, or the height at which the wall is braced laterally and/or the height at which there would be lateral load being transferred to the wall?
Congrats on the “SE.” Haven’t seen that until now.
David A. Topete, SE
From: Jake Watson
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