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Re: Masonry reinforcing

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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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