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Masonry Sound Walls -Reply

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CALTRANS' Bridge Standard Detail Sheets has details for soundwalls.

>>> Chance, Acie P. <acie_chance(--nospam--at)wdi.disney.com> 05/07/98 08:25am
>>>

I am designing a 17 foot tall masonry sound wall and would like to use 12
CMU with out a concrete stem wall. The UBC section 2106.2.4 says to
find the effective height of a wall not supported at the top you need to
multiply the height by two. Section  2107.2.14.2 says walls with a " h'/t >
30 shall be based on force and moments determined from an analysis of
the structure".
Would a "P-delta" analysis using the cracked moment of inertia be the
type of analysis the code is trying to get. I would use 3/8(Rw) times the
deflection for the additional moment due to the wall dead load. Along our
Freeways in California Caltrans is building block sound walls which at 80
MPH seam to have h'/t > 30. 

The Ultimate Strength design section of the code on Masonry is not
written for cantilever walls. Has anyone used the Ultimate Strength
design for cantilever walls. Is there any information published on
cantilever walls analyzed using Ultimate Strength design.  


Thanks 

Acie Chance


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