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RE: when is a wall a column...now lateral ties for walls

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Dave:

As you know I am a mind-numbed building code robot and this is "outside of
the box" for me.

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division 
Development Services Department
Municipality of Anchorage
http://www.muni.org/building
phone:907-343-8183  
fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us



-----Original Message-----
From: Dave Evans [mailto:DEvans(--nospam--at)tnh-inc.com]
Sent: Tuesday, October 09, 2001 6:35 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: when is a wall a column...now lateral ties for walls


The interesting part about this issue is in finding those cases 
where it may be prudent to provide confinement reinforcement even 
though the code may not specifically require it (such as suggested 
by Conrad and my first post).

Dave



From:           	"Haan, Scott M." <HaanSM(--nospam--at)ci.anchorage.ak.us>
To:             	"'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject:        	RE: when is a wall a column...now lateral ties for
walls
Date sent:      	Tue, 9 Oct 2001 07:06:58 -0800 
Send reply to:  	seaint(--nospam--at)seaint.org
Organization:   	http://www.seaint.org

> Dave:
> 
> Other people have said this stuff but here is my take on what the code
> requires.
> 
> 
> For walls ACI 14.3.6 specifically says "vertical reinforcement need not be
> enclosed by lateral ties ... where vertical reinforcement is not required
> for compression." If the reinforcement is not required for compression
then
> it is not required to be in ties unless it is required specifically by the
> seismic code.
> 
> Also similarly for beams the last sentence of ACI 7.11.1 says compression
> reinforcement requires ties and stirrups to be provided throughout the
> distance the compression reinforcement is required.  It does not say ties
> and stirrups are always required.
> 
> Scott M Haan P.E.
> Plan Review Engineer
> Building Safety Division 
> Development Services Department
> Municipality of Anchorage
> http://www.muni.org/building
> phone:907-343-8183  
> fax:907-249-7399
> mailto:haansm(--nospam--at)ci.anchorage.ak.us
> 
> 
> 
> -----Original Message-----
> From: Dave Evans [mailto:DEvans(--nospam--at)tnh-inc.com]
> Sent: Monday, October 08, 2001 4:11 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: when is a wall a column...now lateral ties for walls
> 
> 
> Conrad raises an interesting issue regarding lateral ties for 
> confinement of vertical reinforcment in concrete walls with two 
> curtains.
> 
> Under in-plane deformation, under certain conditions, ACI 318-99 
> requires lateral ties to confine the vertical reinforcement at the ends 
> of walls, but not between the ends.
> 
> Under out-of-plane deformation, the requirement for confining 
> vertical reinforcement in a wall is not so clear.  If one expects high 
> compression strains in a two-curtain bearing wall due to out-of-
> plane deformation, then presumably confinement reinforcement in 
> the region of the high strains would be prudent.  Is anyone aware of 
> literature that specifically addresses the issue of confinement for 
> reliable out-of-plane seismic performance of doubly-reinforced 
> concrete walls?
> 
> Dave
> 
> 
> 
> From:           	"Conrad Guymon" <conrad(--nospam--at)karren.com>
> To:             	<seaint(--nospam--at)seaint.org>
> Subject:        	Re: When is a wall a column?
> Date sent:      	Mon, 8 Oct 2001 13:53:09 -0600
> Send reply to:  	seaint(--nospam--at)seaint.org
> Organization:   	http://www.seaint.org
> 
> > Robert C. Rogers wrote:
> > 
> > "Also note that ACI 14.3.6 tells you that if the
> > predominant mode of loading is flexural and not compressive and the ties
> > are not needed for the compression reinforcement then they can be
> > ommitted (i.e., just vertical rebar and meeting the horizontal rebar
> > requirements per 14.3.4).  Hope this helps....
> > 
> > If you are in an area of seismic risk, I wouldn't omit the ties..."
> > 
> > Conrad
> > 
> > 
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