What is Development Length of Bars?

The development length of the rebar is the shortest embedment length required for a reinforcing bar to develop its full yield strength in concrete. This length is governed by the concrete strength and the yield strength of the rebar. In order to derive this length we use Formula for development length calculation as dictated in ACI 318 and IS 456 Standards.

Generally, if the concrete is weaker or if the rebar has higher yield strength, a longer development length would be required and vice versa. Other factors such as the type of rebar coating, spacing, confinement, and position of the rebar also contribute to the determination of development length. Therefore, the Formula for development length is provided in both Indian standard IS 456:2000 and American Standard ACI 318–14. In this article, we will learn about the formula for development length as per ACI 318–14

If you want to learn about

• Factors which influence development length of rebar
• Development length in beams
• Development length in Columns in footing
• Development length in tension & compression

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