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What is meant by lap length of reinforcement and why is it required?

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Question added by Deleted user
Date Posted: 2016/05/24
Md Ibrahim Hossain
by Md Ibrahim Hossain , Manager/ Site Coordinator , Asia Pacific Consultant Pvt. LTD, Australia

Extension part of rod in a column foot and it is required for strengthening the column

Girij Krishnankutty
by Girij Krishnankutty , Structural Lead , WSP Global Inc

Lap length is the minimum length of overlap required between two serial rebars placed in concrete to transfer tension or compression from one bar to the other. For M25 concrete and Fe415 steel, it is approxiamtely 45d in tension and 35d in tension. The purpose of this length is to allow the transfer of force from one bar to concrete through shear (skin friction) and from concrete to the other bar through shear. If the length is insufficient, only a small force will go through shear and the rest will cause tension (or compression) in concrete, resulting in its failure.

anm shakhawat akber
by anm shakhawat akber , engineer , gothoor al ebdaa

Reinforcement length nedd of 50d(d=reinforcement dia) lap is need for more length make of reinforcement

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