In the case of bars in tension, a standard hook has an anchorage value equivalent to a straight length of 16 times dia. of the bar and a 90-degree bend has an anchorage value of 8 times dia. of the bar. The anchorage values of standard hooks and bends for different bar diameters are given below (as per SP 16: 1980).
Actually, there is no such bend having 45-degree hook. It is 135-degree hooks which are mostly popular as Standard Hooks. For tension bar, anchorage length of 135-degree hooks, bars is 16-time dia. of the bar. (for all grade of the bar)
For tension bar, anchorage length of 90-degree hooks, bars is 8-time dia. of the bar. (for all grade of the bar)