AECT250-Lecture 30

AECT250-Lecture 30 - Lecture 30 Development of...

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Lecture 30 - Page 1 of 9 Lecture 30 – Development of Reinforcement, Splices, Hooks Reinforcing bars must be embedded a minimum distance into the concrete in order to achieve the full tensile capacity, T of the bar. This length is referred to as “Development Length”, L d . The development length is based upon the BOND between the rebar and the concrete. Factors affecting this bond include the following: Type of ribbing on the bar Presence of epoxy (or other ) coating Concrete quality Distance between bar and edge of concrete Type of end anchorage into the concrete Concrete L d Rebar T = A s f y
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Lecture 30 - Page 2 of 9 Determining L d for Tension Bars : a) #6 and smaller bars : c y b d f f d L ' 25 αβλ = b) #7 and larger bars : c y b d f f d L ' 20 = where: d b = diameter of bar f y = yield strength of bar, PSI f’ c = specified concrete compressive strength, PSI α = alpha = Bar location factor = 1.3 for top reinforcement = 1.0 for all other locations β = beta = Coating factor = 1.5 for epoxy coated bars = 1.0 for uncoated bars λ = lambda = Lightweight aggregate factor = 1.3 for lightweight aggregate = 1.0 for normal weight aggregate
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Lecture 30 - Page 3 of 9 Example 1 GIVEN : A #6 rebar under tension force. Assume the following conditions: Concrete f’ c = 4000 PSI
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AECT250-Lecture 30 - Lecture 30 Development of...

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