For beam hook= (beam depth-both side covers)/2 for example if it is a 450mm depth beam then hook is (450-50)/2=200 where cover for beam is taken as 25 mm 2. For stirrups the hook=4d as per is codes but according to site conditions it is 50 mm per hook while doing bar bending schedule. 3. For slab the rod the crank length is l/5.
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