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Re: Masonry in Las Vegas Fully Grouted or Partially Grouted

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There are several "R" values for us in seismic country.  They are based on the detailing provisions, just like concrete or steel.  There are options for Special, Intermediate, Ordinary, and several other wall types each with less reinforcing.  See '03 IBC Table 1617.6.2.

Detailing requirements for "Special" walls requires that horizontal reinforcing be spaced no more than H/3 or L/3.  As you can see, if your wall (or pier) is less than 12 feet long, your bond beams get tight in a hurry.  Window openings can create heavily reinforced adjacent piers.  With all that horizontal steel, there aren't many opportunities for ungrouted cells.

Jake Watson, P.E.
Salt Lake City, UT

On 9/27/06, Rich Lewis <seaint04(--nospam--at) > wrote:



What is a "special masonry wall"?




From: Jake Watson [mailto:jake.watson1(--nospam--at)]
Sent: Tuesday, September 26, 2006 9:52 PM
To: seaint(--nospam--at)
Subject: Re: Masonry in Las Vegas Fully Grouted or Partially Grouted


How do you do special masonry walls with partial grout?  The L/3 spacing requirement all but mandates solid grout for anything but the most simple walls.  You have to have a 12 foot long pier before you can use bond beams at 48" on center.  Any pier less than 6 feet long requires bond beams at 24" on center, you might as well grout solid at that point.

P.S. How many people use Strength Design for masonry?  I have done it for several years and am the only one in my office using it.  Now I am studying for the NCEES SEII exam and I can't use it!  I must re-learn the WSD methods and it driving me nuts!

Jake Watson, P.E.
Salt Lake City, UT