Anchorage Value of a Standard Hook in Reinforcement Bar

The anchorage value of a standard hook in a reinforcement bar is an important aspect to consider in the design of reinforced concrete structures. It refers to the ability of the hook to resist the tensile forces that develop in the reinforcement bar when it is subjected to a load.

Factors affecting Anchorage Value

The anchorage value of a standard hook depends on several factors, including the diameter of the reinforcement bar, the length of the hook, the angle of the hook, and the type of concrete used in the structure.

Formula for Anchorage Value

The anchorage value of a standard hook can be calculated using the formula:

Ld = K tr f yt /σ st

Where,
Ld = development length
K = factor depending on the type of hook and diameter of bar
tr = radius of the bend in the hook
fyt = characteristic yield strength of the reinforcement bar
σst = stress in the reinforcement bar at the point of hook

Value of K

The value of K for a standard hook is 16 for a reinforcement bar of diameter D.

Therefore, the anchorage value of a standard hook of a reinforcement bar of diameter D is 16D. This means that the development length for a standard hook in a reinforcement bar of diameter D is 16 times the diameter of the bar.

Importance of Anchorage Value

The anchorage value is important in ensuring that the reinforcement bars do not slip out of the concrete. This can result in the failure of the structure. Therefore, it is essential to ensure that the anchorage value of the hooks is sufficient for the design loads and conditions.

Conclusion

In conclusion, the anchorage value of a standard hook in a reinforcement bar of diameter D is 16D. This value is important in ensuring the safety and stability of reinforced concrete structures.

For every 45degree its 4D and In case of standard hook its 180degree ,So it will be 4*4D = 16D.
thanks