(i) hooks are provided for resist seismic movement
(ii) to prevent concrete from splitting outward.
(iii) it prevent slippage of steel from the concrete.
(iv) to keep longitudinal steel bars in position and hold steel tighty.
How to calculate cutting length of stirrup
According to the is-456 2000 formula
L = 2( a+b)+hook length - bend
L = 2(a+b) + 10d - 2Nd
Where d- diameter of stirrup bar
a- length of column size
b- breadth of column size
L- total length of stirrup
N- number of bend
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