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# Re: masonry block properties

• To: seaint(--nospam--at)seaint.org
• Subject: Re: masonry block properties
• From: jim jensen <doublejtp(--nospam--at)yahoo.com>
• Date: Wed, 30 Jul 2003 21:35:35 -0700 (PDT)

```I'd call the Manufacture of the CMU. I would guess
it's 1800 psi,I hate guessing. Jim Jensen
--- Andrew Kester <andrew(--nospam--at)baeonline.com> wrote:
> To prove a point, I have to determine the allowable
> 8"x 16" section of block wall. Now I know I have to
> check everything
> according to ACI 530-99, C-20, Sect. 2.2
> Unreinforced Masonry. But, to
> calculate the bending stress in the block, ungrouted
> with no reinforcement,
> is completely different then standard reinforced
> masonry design. I am
> assuming I would use the following regular
> engineering mechanics formula for
> bending stress:
>
> Fb= M/S
>
> S- this is the problem, as it is hollow block. I
> cannot find any tables for
> this, and I have quite a few resources. Does anyone
> have this value in a
> table? Would it be improper to just hand calc the Sx
> for a 8"x16" hollow
> block? Now would a simplifed way of doing this, to
> be calculate Sx for a
> solid 8x16 block, then subtract the Sx for the
> cavities? This ignores the
> curved cavity walls, and the thickness of walls is
> different on the top then
> the bottom, etc.
>
> I do not see why this is wrong, then I calc. Fb as I
> did above. The same
> goes for Ix calc, which I need for formula (2-15) to
> calc Pe.
>
> Thanks in advance. If you can directly CC me that
> would be great because I
> get the digest list once a day.
>
> Andrew Kester, EI
> Longwood, FL
>
>
>
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