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Re: Tension in Concrete

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Alex C. Nacionales
Iloilo City, Philippines

On Fri, 22 Jan 1999, Alex C. Nacionales wrote:

> I would like your opinion regarding using the tensile strength of
> concrete(10% of Fc') in structural computations.

My opinion is that there is so much variability in the tensile strength of
concrete that you should not use it.

If you want to take the tensile strength into account, then you should
treat the section as "Plain" or unreinforced, and the PHI or strength
reduction factor is 0.65 ACI318-95 section 9.3.5, rather than 0.90 for
flexure on reinforced concrete sections.

Edwin R. Schmeckpeper, P.E., Ph.D.
Department of Civil Engineering                   Phone  : (208) 885-6702 
University of Idaho                               FAX    : (208) 885-6608
Moscow, Idaho 83844-1022                          E-Mail : eds(--nospam--at)