1. Spalling Reinforcement :-
These stresses are induced by strain incompatibility with Poisson’s effects or by the shape of stress trajectories.
2. Equilibrium Reinforcement :-
Equilibrium reinforcement is required where there are several anchorages in which prestressing loads are applied sequentially.
3. Bursting Reinforcement :-
Tensile stresses are induced during prestressing operation and the maximum bursting stress.
Trajectories are concave towards Action of the loads. Reinforcement is needed to resist these lateral tensile forces.