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RE: masonry block properties

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NCMA's TEK Bulletins (TEK 141) provide masonry properties for various block
sizes with various grouted cell conditions. Try www.ncma.org, Online
Resources, e-Tek, and then search for a website with TEK bulletins on the
web.  

William C. Sherman, PE
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com


> -----Original Message-----
> From: Andrew Kester [mailto:andrew(--nospam--at)baeonline.com]
> Sent: Wednesday, July 30, 2003 10:41 AM
> To: seaint(--nospam--at)seaint.org
> Subject: masonry block properties
> 
> 
> To prove a point, I have to determine the allowable load for 
> an unreinforced
> 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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