what is lap length and development length

Question

Accepted Answer

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

Lap length is important to ensure the continuity of reinforcement in a structure.
Development length is important to ensure that the reinforcing bar can transfer the stress to the concrete without slipping.
Lap length and development length are determined by the diameter of the bar, the strength of the concrete, and the type of structure being built.
For example, in a reinforced concrete beam, the lap length is typically 50 times the diameter of the bar, while the development length is typically 40 times the diameter of the bar.

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