Difference between Lap & Development length?

Question

Accepted Answer

Lap length is the length of overlap between two reinforcing bars, while development length is the length required to transfer the stress from the bar into the concrete.

Lap length is used to ensure continuity of reinforcement along the length of the bar.
Development length is used to ensure proper bond between the reinforcing bar and the concrete.
Lap length is typically specified in terms of diameter of the bar, while development length is specified in terms of the bar diameter and concrete strength.
Example: For a 20mm diameter bar, the lap length might be 40 times the diameter (800mm), while the development length might be 24 times the diameter (480mm) for normal strength concrete.

Accepted Answer

Lap length refers to the distance required for one reinforcing bar to overlap another to maintain structural integrity and transfer load effectively, while development length is the length of the bar required beyond a critical section to develop its full strength by bonding with the surrounding concrete.

Difference between Lap & Development length?

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Difference between Lap & Development length?