It is the length of the main bar provided at the column beam junction or column footing junction to allow for the development of stresses to its design strength.
Anchorage length is the required distance to transfer a load and is dependent on the materials used. Development length is the length of the reinforcement bar or rod required to transfer the load safely to another bar.
40 times diameter
you can generally use 180 degree hooks, to provide enough anchorage in slabs with no edge beams. use the Ldh formula (12.5.2) of ACI 318-11
Formula to calculate length of spiral reinforcement in columns
The minimum covering of reinforcement for roof slab is 30mm
0.25l, 0.3l
3000 psi
25kg to 50kg /m3 of concrete
By using IS code(456-2000) for reinforced cement concrete.
The steel reinforcement used will depend on several factors. Column length, beam length, and the column and beam cross section all depend on how much steel will be needed.
if the bar length is 5o m , what will be the actual length including lap length
maximum spacing assording to IS 456 = 300mm