Difference between lap length and development length

Question

Accepted Answer

Lap length is the overlap of reinforcement bars in concrete, while development length is the length of bar required to transfer stress to concrete.

Lap length is used to ensure continuity of reinforcement across a joint or splice in concrete elements.
Development length is required to develop the full strength of the reinforcement bar and transfer it to the surrounding concrete.
Lap length is typically specified in terms of the diameter of the reinforcement bar.
Development length is influenced by factors such as bar diameter, concrete strength, and bond strength.
For example, if the lap length specified for a 12mm diameter bar is 40 times the diameter, the overlap would be 480mm.
On the other hand, if the development length required for a 16mm diameter bar is 40 times the diameter, it would be 640mm.

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