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Re: Re-bar Congestion

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Powers, Tony wrote:

> Here's my 2 cents:
>
> Assuming the wall is more than a couple feet long, these anomalies are
> not too frequent or too close together, and the resultant smaller
> spacings do not violate minimum spacing requirements, I wouldn't be too
> worried about it.
>
> Tony Powers
>
> > -----Original Message-----
> > From: Mike Brown [SMTP:mike.brown(--nospam--at)cshqa.com]
> > Sent: Thursday, August 13, 1998 8:53 AM
> > To:   seaoc
> > Subject:      Re-bar Congestion
> >
> > Hello everyone.
> >
> > I have a re-bar congestion problem where the bars are interfering with
> > the form ties.  The situation is a 14 inch thick wall with (2) #11
> > bars vertically at 5" o.c.  There are 4 walls that form a "box column"
> > in plan view.  This box column not only resists some vertical loads,
> > but is also the lateral resisting system for the eight story building.
> >
> > The conflict is between the form ties and the bars.  The contractor is
> > not able to locate the form ties so that there will not be a conflict
> > with the bars.  The problem has to do with the splices.  Due to the
> > tight spacing of bars and the fact that the dowels from the foundation
> > were a little off, but within tolerance, there is a conflict at every
> > pour height.
> >
> > We are now at the sixth floor.  Up until this point the bars were
> > shifted as required but stayed within the specified tolerance.
> > However, we have come to a point where a couple of the bars need to be
> > spaced about 8 inches in place of the specified 5 inches.  The total
> > number of bars does remain the same and therefore the average spacing
> > of bars is still 5 inches.  My question is that if this occurs only in
> > some localized area, what compromises will the wall suffer?  Will the
> > system as whole be compromised?  Will there only be additional cracks
> > in the wall at this location?
> >
> > Any help and opinions would be appreciated.
> >
> > Thank you.
> >
> > Mike Brown, P.E.
> >
>

  the only way to avoid this situation would have been to stagger the
splices in these verts, but some much for armchair quarterbacking.