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Re: Steel Reinforcement Elongation Limit

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Bart,

Very true.

That is why I precede my presentations to the engineering community with
"bad news" and "good news" :

Bad News  :  Composite (FRP) strengthening is not covered by codes...

Good News : Composite (FRP) strengthening is not covered by codes...


i.e. Engineers have an opportunity to "engineer" a solution...

Now...if we could only limit the influence of lawyers.............

jim

----- Original Message -----
From: Bart Kemper, P.E. (http://www.bigdogz.com/bart) <bkemper(--nospam--at)bigdogz.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, July 26, 2000 8:33 AM
Subject: Re: Steel Reinforcement Elongation Limit


> Jim,
>
> If you can get some details on the composite material and the
> steel/composite geometery you are proposing, I might be able to help.
> For FRP and similar composite materials, it is somewhat true the
> material is "elastic until failure, with no plastic deformation."
> However, there is no hard and fast rule about how much the steel can
> elongate safely since so much of the answer is "it depends."  I've run
> across this in process equipment and related facility work, and have
> seen failure where loads were well below yield yet either the composite
> failed or the bond failed due to composite internal structure, localized
> stresses/deformations, or significant differences in the rate of
> elongation for a given load.  There aren't any easy "cookbook" codes on
> the matter precisely because of the variables and continual changes in
> technology involved.
>
> Clear as mud?  Short answer: as long as the steel doesn't elongate and
> everything is below yield, there is no problem.  Usually.  If the steel
> does flex or otherwise deform where the composite bonds with the
> steel......it depends.  You can email me offlist (bkemper(--nospam--at)bigdogz.com)
> if you'd like.
>
> Bart Kemper, P.E.
>


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