what is lap length? why it is required?

Answer Posted / priya

In the construction of RC buildings, due to the
limitations in available length of bars and due to
constraints in construction, there are numerous
occasions when column bars have to be joined. A
simple way of achieving this is by overlapping the two
bars over at least a minimum specified length, called
lap length. The lap length depends on types of
reinforcement and concrete. For ordinary situations, it
is about 50 times bar diameter. Further, IS:13920-1993
prescribes that the lap length be provided ONLY in the
middle half of column and not near its top or bottom

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