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RE: Masonry/Rebar bond stress for lap splice

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Re: Reinforce Masonry Engineering Handbook, Clay and Concrete Masonry, James Amrhein.
page 101 5-5.B Bond Between Grout and Steel
Amrhein references "Bond and Splices in Reinforced Masonry", by Soric and Tulin, 1987.  In this report bond stresses at failure were about 1000 psi.
The formula is :
u = V / ((Sigma sub 0) j d
u = bond stress
sigma sub 0 is the perimeter of the bar
Harold O. Sprague 
-----Original Message-----
From: Al McPeters [mailto:amcpeters(--nospam--at)]
Sent: Thursday, July 31, 2003 4:29 PM
To: seaint(--nospam--at)
Subject: Masonry/Rebar bond stress for lap splice

Is there an equation to calculate the masonry bond stress for grout?  I see the 160 psi listed as basis for the lap splice lengths in ACI 530 but can't find a specific reference for masonry.  The references in ACI 530 are from the 1920's and 40's.  Is it an empirical limit?   My problem is a low grout strength (1810 psi). I am concerned with the lap splice length in the wall and want to calculate an actual splice length required for the applied load in the bar. I can't find a lap splice length equation, other than for concrete, that includes the grout compressive strength.  Building is 1996 BOCA so I have 48 bar diameter splices.  I don't like the IBC splices as they are too long.  Thanks in advance.

Al McPeters, P.E.

Senior Associate


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