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Re: Steel Modulus and Strength

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Those are the values I'll have our consultants utilize in our forthcoming
software as defaults....thanks.

Anyone interested in evaluating the software....."Flexural Strengthening
with SCI S&P CFRP Laminates......Shear strengthening with SCI CFRP sheets"
please let me know.

jim korff, pe
sci

----- Original Message -----
From: "Charles Espenlaub" <Cespenlaub(--nospam--at)martinaia.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, July 26, 2000 5:32 AM
Subject: RE: Steel Modulus and Strength


> It has been my experience that most engineers use
>
> E = 29,000 ksi
>
> Fy = 60,000 for grade 60
>
> Fy = 40,000 for grade 40
>
>
> Charles F. Espenlaub, III, P.E.
> Martin-Espenlaub Engineering
>
>
>
> -----Original Message-----
> From: John Riley [mailto:jpriley485(--nospam--at)peoplepc.com]
> Sent: Wednesday, July 26, 2000 7:12 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Steel Modulus and Strength
>
>
> I doubt there are many structural engineers out there who haven't
> struggled
> with the fact that engineering is not science.
>
> The simple fact is that often times we are working with materials whose
> properties cannot be accurately defined.  Concrete is normally specified
> to
> be a minimum compressive strength; specify 3,000 psi and you might end
> up
> with 4,500 psi (and that's just at 28 days).  Reinforcing and structural
> steels are similarly specified.  These are quasi-manmade products, where
> quality control results in better guesses.  How does one accurately
> predict
> performance of a piece of wood without knowing all the knot locations,
> growth history, moisture content, etcetera?
>
> As for me, I'm not sensitive to the assertion that structural
> engineering is
> backward relative to other disciplines.  My daughter is a third year
> medical
> student at the University of Iowa; I think she'd be quick to say an MD
> does
> not practice science.  She might even say that MD's "treat for diseases
> and
> maladies we don't know.....utilizing salves, ointments, oils, and drugs
> whose behavior we don't understand....etc...etc...etc...."  Of course,
> medicine has a basis in science, just like engineering.  MD's and
> structural
> engineers must "bracket" their solutions . . . just like the rocket
> scientists at NASA, where they do work that is close enough for the
> government.
>
> John P. Riley, SE
> Riley Engineering
> Blue Grass, Iowa
>
>
> ----------------------------------
>  I know that. It doesn't make any difference as to the amount of
> reinforcement one utilizes....
>
> It does however make a difference when one is attempting to step out of
> the
> cook-book code driven pseudo-design mentality, and truly wants to
> engineer a
> structure...
>
> I believe responses like that perpetuate the backwardness of
> civil/structural engineering in relation to other disciplines.
>
> It's like saying...we don't really know ...but it's close enough for
> government work.....
>
> It perpetuates the definition of structural engineering ... which
> interestingly enough was removed from the SEAOC web site home
> page...that we
> "design for forces we don't know.....utilizing materials whose behavior
> we
> don't understand....etc...etc...etc...."
>
> If anyone out there has a less condescending or simplistic answer, and
> truly
> knows which value is closer to the actual value...please let me know...
>
> jim
>
> > >It doesn't make any difference.
> > >
> > > It doesn't make any difference.
> > >
> > > It doesn't make any difference.
> > >
> > > A. Roger Turk, P.E.(Structural)
> > > Tucson, Arizona
> > >
> > > Jim Korff wrote:
> > >
> > > >>Is the correct E Modulus for steel rebar 30,000 ksi  or 29,000 ksi
> ??
> > >
> > > Is the correct yield strength of  Grade 60 rebar 60 ksi or 58 ksi ??
> > >
> > > Is the correct yield strength of  Grade 40 rebar 40 ksi or 38.7 ksi
> ??<<
> > >
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