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Differentiate Lap length and development length in RCC member.If they both are different then why do we follow development length as lapping length?

Please comment with clauses of IS code/ any relevant  if you have.

On Site Plan Execution Engineering Reinforcement Learning Site Engineering
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Question added by SYED NASIR AHMED , Sr. Site Engineer , Turner International Consulting India Pvt Ltd
Date Posted: 2015/05/20
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Sajith Vidyadharan Sumangala
by Sajith Vidyadharan Sumangala , Project Engineer , Salam Enterprises

The difference between the two is in the application. A development length is the amount of rebar length that is needed to be embedded or projected into concrete to create a desired bond strength between the two materials. The lap length is the length two rebar pieces must overlap and be tied together to create a bond as if there was no break and the run is "continuous". 

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