When we do detailing for RC structures, the rebars in a beam have to anchor into a column. For an external column (not at the roof), the rebars are usually bent in 90 deg to provide sufficient anchorage length.

When I read the design manuals, books, etc, the rebars are always bent to the far face of the beam. E.g. The top bars in the beam bend to the bottom and the bottom bars bend to the top.

May I know why is the bending direction always like that?