The stiff behavior of the T-head anchorage improves the effectivity of the anchored bar. The T-headed bar gets “active” almost immediately after loading, while a bend bar loses much of its effect to deformation of the concrete under the bend. The load-deformation behavior of a bend bar includes a certain concrete crushing.
The stiff anchorage of T-headed bars is taken advantage of by use as confining – and shear reinforcement. Provided sufficient anchorage capacity for existing loads, the effect of headed reinforcement is superior to bend bars.
The ease of installation and no limitation by bending radii are additional benefits of T-headed bars.