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Re: ACI 530 Masonry ASD

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My supervisor just attended a seminar on ACI530, and one of his comments to
one of the presenters was something like "Why aren't you guys including
strength design?  We've been designing concrete this way for decades, the
materials are similar, ...."  Another complaint was the inclusion of
unreinforced masonry.  Our take on unreinforced masonry is that you would be
crazy to design anything unreinforced.

His take on the ACI530-99 code is that it is written only for allowable
stress design.  The chapter on strength design (called Limit States Design
or something similar, not quite ACI-318 Strength Design, but a lot closer
than ASD) is forthcoming.

That's my (admittedly limited) understanding of ACI530.

Conrad


----- Original Message -----
From: "Sherman, William" <ShermanWC(--nospam--at)cdm.com>
To: "SeaInt Listserver (E-mail)" <seaint(--nospam--at)seaint.org>
Sent: Wednesday, October 03, 2001 1:44 PM
Subject: ACI 530 Masonry ASD


> ACI 530-99 has some rather confusing provisions within Chapter 2,
Allowable
> Stress Design. An engineer in my office asked me why "strength reduction
> factors" are being applied under allowable stress design - based on
Section
> 2.1.1.2.3.3. It took me a while to figure it out, but as far as I can
tell,
> Section 2.1.1.2.3 seems to only apply to "strength design" even though it
is
> in the "Allowable Stress Design" chapter.
>
> Section 2.1.1.2.3 states that this section only applies for masonry "not
> designed in accordance with Section 1.1.3". Section 1.1.3 requires masonry
> to be designed per one of the given Chapters, including Chapter 2 for
> Allowable Stress Design. So if you are not designing in accordance with
> Chapter 2, this subsection of Chapter 2 applies - Huh?!
>
> I assume that the intent is that if you are not using allowable stress
> design per this code, then you should use the ASCE load factors and given
> strength reduction factors. Unfortunately it does not explicitly say this,
> and it is very confusing talking about "strength design" requirements in a
> chapter on allowable stress design.
>
> Has anyone else tried to apply this code to allowable stress design of
> masonry? Is my interpretation correct?
>
> (Note: The next revision for this code is currently out for public review
> via the ACI website or www.masonrystandards.org, but this section has not
> been clarified in the proposed revisions. If someone can help me
understand
> the intent, I will send in comments to clarify this document.)
>
>
> William C. Sherman, PE
> Camp Dresser & McKee, Inc.
> Denver, CO
> Phone: 303-298-1311
> Fax: 303-293-8236
> email: shermanwc(--nospam--at)cdm.com
>
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