The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is A. 30° B. 40° C. 45° D. All the above

The correct answer is: D. All the above.

The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend is 30°, 40°, or 45°. This is because the anchorage value is a measure of the strength of the bond between the bar and the concrete. The greater the angle of the bend, the stronger the bond and the higher the anchorage value.

Here is a table showing the anchorage value of a hook for different angles of bend:

Angle of bend | Anchorage value
——- | ——–
30° | 16d
40° | 18d
45° | 20d

where d is the diameter of the bar.

It is important to note that the anchorage value is only a theoretical value. The actual anchorage value may be lower than the theoretical value due to factors such as the quality of the concrete, the type of bar, and the workmanship.