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Re: Concrete tension capacity
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 To: <seaint(nospamat)seaint.org>
 Subject: Re: Concrete tension capacity
 From: "Ib sa" <IESENG(nospamat)msn.com>
 Date: Sun, 8 Sep 2002 07:33:30 0700
Thank you Scott. Ib  Original Message  From: Scott Maxwell Sent: Saturday, September 07, 2002 10:22 PM To: seaint(nospamat)seaint.org Subject: Re: Concrete tension capacity Take a look at chapter 22 of the ACI 318...it deals with the design of structural plain concrete (i.e. unreinforced).
Section 22.5 addresses strength design of structural plain concrete. Eq 222 gives the nominal moment capacity of a plain concrete section if tension controls (the 2002 edition is this specific where the 1999 does not specifically state that it is for tension controls, but that is still the end result):
Eq 222 Mn=5*sqrt(f'c)S
where S is the corresponding elatic section modulus.
Thus, using good old solid mechanics (stress=My/I or M/S), the limiting tensile stress is 5*sqrt(f'c).
Obviously, when actually doing the design, there is an added factor of safety when the effect of phi is included. The limiting design tensile stress will be phi*5*sqrt(f'c) or .9*5*sqrt(f'c) or 4.5*sqrt(f'c).
HTH,
Scott Ypsilanti, MI
On Sat, 7 Sep 2002, Ib sa wrote:
> Does anyone know if there is a formula in the ACI code that gives the capacity of concrete in tension without any reinforcment. I have used 10% of the concrete strength. > > Thank youGet more from the Web. FREE MSN Explorer download : http://explorer.msn.com >
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