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Re: Steel Reinforcement Elongation Limit

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That is why we design at 50% or less of the ultimate elongation, and that
still leaves us with a strength four times that of steel.....this is easy to
do....the limiting factor will always be the concrete and existing steel
properties......

Using your reasoning, noone would have come up with reinforced concrete at
all....noone would have said...gee...let's figure out the balanced area of
steel reinforcement...and then take 75% of that.....we would have just
said......steel is ductile....concrete is not....therefore BOOM!!!!

Can we try to be a little bit progressive here.....and innovative......or is
that an oxymoron....the innovative US Structural Engineer.......

Are we doomed to the BOOM!!! mentality....and willing to robotically follow
the cookbook codes with blinders on...????? Unwilling to resarch new
materials and methods....?????

I believe not.....if only we could eliminate the Attorney's influence on our
practice.......aahhhh....but that would make us like Europeans.....we would
have to use our minds........ heaven forbid......



jim


BTW:  Lot's of structures have gone BOOM!!!!...without any
composites.........composites will actually harden buildings...if used
correctly....
----- Original Message -----
From: "Roger Turk" <73527.1356(--nospam--at)compuserve.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, July 25, 2000 10:23 PM
Subject: Re: Steel Reinforcement Elongation Limit


> Yes, that is the problem with them!  They are like glass -- perfectly
elastic
> until, ---- BOOM!
>
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
>
> >>This is true....
>
> I am however trying to determine what would be an appropriate limiting
> elongation when applying composite plates to the underside of beams for
> flexural strengthening.
>
> Composites have no plasticity...they are elastic to failure....
>
> Plates can be manufactured to have the same modulus as steel (oops...is
that
> 29ksi or 30ksi ?).....However, they are elastic up to failure, so it would
> be nice to have an understanding of the maximum elongation that will keep
> the underlying concrete from separating from the existing steel
> rebars....precisely to avoid catastrophic failures..
>
>
> jim<<
>
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