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Re: Existing RC beam Strengthening

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Paul,

        Perhaps the carbon reinforcing could be re-applied after any fire if
fire rating is the only concern.  This may leave a short time period between
fire and repair when the structure is under designed.  Just a thought.

Regards,

H. Daryl Richardson

Paul Crocker wrote:

> I attended a presentation by some of the carbon fiber wrap sales & design
> people a few months ago, and (if I remember correctly) they had a paint-on
> fire proofing that worked fairly well, but added considerably to the price.
> It seemed like a powerful tool if you have the right application, but still
> something to look at case by case.
>
> Paul Crocker, PE, SE
>
> -----Original Message-----
> From: Scott Maxwell [mailto:smaxwell(--nospam--at)engin.umich.edu]
> Sent: Monday, July 08, 2002 8:22 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Existing RC beam Strengthening
>
> You may want to use a little caution when using carbon fiber reinforcement
> to reinforce/retrofit a concrete member.  I have heard a number of times
> that a major concern with carbon fiber wraps is fire resistence.  The
> carbon fiber reinforcement does not do well when heated during a fire, as
> I understand it.  As a result, I believe that the consensus is that using
> carbon fiber reinforcement in buildings is still not ready for
> "primetime".  I do know that it is becoming more prevelent to reinforce
> bridges.  I could be a little out of times on the use of it in buildings,
> but I have not heard anything at would suggest that.
>
> HTH,
>
> Scott
> Ypsilanti, MI
>
> On Mon, 8 Jul 2002 eric(--nospam--at)hernandez.net wrote:
>
> > Mr. Ong :
> >
> > There are various things to verify; moment capacity,
> > shear capacity, deflections and cracking.
> >
> > To improve the strenght (moment and shear) the  way to
> > go is carbon fiber reinforcement, this is very simple
> > to apply, and I have used this with very good results.
> >
> > But if you have problems with deflections and cracking,
> > then you either have to increase the height of the beam
> > or use post-tensioning
> >
> > "T.K. Ong" wrote
> >
> > >
> > > Floor usage of the existing floor to be change thus
> > some of the rc beam will
> > > be undercapacity at sagging & hogging moment. Due to
> > floor clear height
> > > constraint, the architect not allowed deepen the beam
> > beam more that 100mm.
> > > Can any one on the list have experience on this type
> > of works?
> > > Any advice and comment will be much appreciated.
> > >
> > > Thank in advance
> > >
> > > TK
> > >
> > >
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