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RE: Masonry Lap Splices

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Do you need a full lap splice?  You can shorten the required splice by the
ratio of the actual stress in the steel vs. the maximum allowed stress.  For
example, if you only have 12ksi in your bar, the required lap length would
be 1/2 that required at 24ksi.  This should be fairly helpful if you are
near the top of a wall.

Some other thoughts, it is only a lap splice when the bars are relatively
close to each other.  The number of 5 bar diameters comes to mind, but you
should look it up.  If you use two reduced bar sizes (2 #4's instead of a
#6), some thought should be given to bundling effects.  I don't know if the
provisions are in masonry, but they are definitely in concrete.  Lastley,
you mentioned mechanical splices but not epoxy.  Look into epoxy, you can
drill holes next to existing bars and then epoxy new bars in place.

Best of luck,

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

-----Original Message-----
From: Roland Bokma [mailto:bokmar(--nospam--at)progressiveae.com]
Sent: Thursday, July 11, 2002 5:18 AM
To: 'seaint(--nospam--at)seaint.org'
Subject: Masonry Lap Splices



	Hello all,  I have an existing masonry block wall that I am looking
to extend up.  It is a site retaining wall and I would like to extend the
reinforcing up into block that I am extending.  The existing wall is
reinforced with #6 bars at 24" oc.  I have gone to the site and can see the
grouted cores and the bond beam is 3 block courses down.
	I need a lap splice of 36", but with the bond beam 24" down I cannot
get that.  I could used mechanical connectors but then I would need to demo
into the grouted cells to expose the existing rebar, potentially splitting
the block.  My boss suggested that we could put bars into the cores on
either side.  The theory being that two bars lapped 24" is equivalent to one
bar lapped at 36".  Is that a credible idea?  Code only gives lapped, welded
or mechanical connectors.

	TIA
	Roland Bokma
	Structural E.I.T.
	ProgressiveAE
	www.progressiveae.com

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