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Re: Masonry reinforcing

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you can also place a couple of inches of gunite to the inside of the
wall. I have done this on some retrofit projects.

Stan Scholl, P.E.
Laguna Beach, CA

On Wed, 3 Oct 2001 10:07:56 -0600 "Conrad Guymon" <conrad(--nospam--at)karren.com>
writes:
> You CAN add additional bars from one side if you want to go to the 
> fuss and
> bother of cutting out the faces of some void cells, and adding bars 
> and
> grout.  It's a lot of work, but we have spec'd this and had it done 
> on a
> seismic retrofit project.
> 
> Conrad
> 
> ----- Original Message -----
> From: "Tom Allen" <Allen(--nospam--at)3DI.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Wednesday, October 03, 2001 9:07 AM
> Subject: RE: Masonry reinforcing
> 
> 
> > The 97 UBC section 2104.5 and associated sections will tell you 
> what the
> > requirements are.  Since the cells which contain rebar are solid 
> grouted,
> > there is no way to add additional bars and make it conform to 
> code.
> >
> > -----Original Message-----
> > From: Foy, Warren [mailto:Warren.Foy(--nospam--at)mhgrp.com]
> > Sent: Friday, September 28, 2001 9:09 AM
> > To: 'seaint(--nospam--at)seaint.org'
> > Subject: RE: Masonry reinforcing
> >
> > I failed to mention that there is a brick veneer on the exterior 
> side so
> > there is access to only one side.
> >
> >
> >
> > I have a project under construction on which the reinforcing steel 
> in the
> > masonry walls have been found to have been put in incorrectly.  
> These
> walls
> > are non-loadbearing walls subjected to 25 psf wind loads and are 
> shear
> wall.
> > I would like to ask this forum two question concerning the intent 
> of ACI
> > 530.
> >
> > 1.  The dowels extending from the foundation appear to have been 
> installed
> > correctly but the upper bars are in question.  Can the bottom 
> section of a
> > wall be considered reinforced and analysed using chapter 7 and 8 
> of ACI
> 530
> > and the middle and upper sections of the same wall considered 
> unreinforce
> > to meet the criteria of chapter 6?
> >
> > 2.  Chapter 8 of ACI 530 indicates required lap splices of 0.002 
> Fs db or
> 48
> > bar diameters and developement lengths of 0.0015 Fs db or 36 bar
> diameters.
> > Can these lengths be reduced as a function of (As provided)/(As 
> required)
> as
> > allowed by ACI 318?
> >
> > Also, do you have any suggestion as to how to add reinforcing bars 
> in an
> > existing masonry wall?
> >
> >
> >
> > Warren S. Foy
> > Structural Design Manager
> > The Mason & Hanger Group Inc.
> >
> >
> > 300 West Vine Street, Suite 1300
> > Lexington, KY   40507-1814
> > voice: 859.252.9980
> > fax: 859.389.8870
> > web: http://www.mhgrp.com
> >
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