Why Hook is provided in stirrups?

why the hooks are provided in stirrups?

Hook is offered in stirrups for the subsequent purposes:

• To avert buckling of the column.
• The major need for protection against bond breakdown is as it offers an adequate expansion of the bar length above the point wherein/where the steel is needed to grow its yield stress as well as the length should be as a minimum up to its development length.

On the other hand, in case the definite present length is insufficient for complete development, particular anchorages should be offered, like hooks or mechanical end plates, or cogs.

• Hooks are offered to oppose the seismic movement.
• To avert concrete from partitioning externally.
• It averts steel slippage from the concrete.
• To maintain longitudinal steel bars in place as well as keep steel firmly.

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