Development Length is provided to transfer the load from steel to concrete. Development Length is also known as anchorage length.
According to IS 456:2000, the calculated tension or compression in any bar at any section shall be developed on each side of the section by providing appropriate development length or by an end anchorage so that the member won’t be slipped away from the support.
Such length will be provided in a continuous beam, cantilever slabs and other critical joints (beam-column). It will be provided as a bend where the restraining member is thin like an end beam as shown above (Ld).
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