What is Overlapping Length in Beam, Column and Slab

This video describes lapping length in structural member. Lapping length is used to join together two steel bars in order to safely transfer the load from one bar to another. There are different requirement for lapping length for different structural members. For more detail please watch full video.
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Overlapping length
What is lapping length
why lapping length
Lapping length in beam column and slab