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RE: ASCE 705 rho
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 Subject: RE: ASCE 705 rho
 From: "Ehrlich, Gary" <gehrlich(nospamat)nahb.com>
 Date: Thu, 22 Mar 2007 09:55:53 0400
The Notation section in Section 11.3 of
ASCE 705, 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:
2022668545 or 8003685242 x8545 fax:
2022668369 From: David Topete
[mailto:dtopete(nospamat)gfdseng.com] Jake, My guess, since I don’t have a copy
of ASCE 705 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
[mailto:jake.watson1(nospamat)gmail.com]

 References:
 ASCE 705 rho
 From: Jake Watson
 RE: ASCE 705 rho
 From: David Topete
 ASCE 705 rho
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