Variations of tendon stresses in pre or post-tensioned concrete

Variations of tendon stresses in pre or post-tensioned concrete members, along the length of tendons, may be of a different nature. In a post-tensioned member, stresses in different tendon wires, simultaneously stretched. But if a single post-tensioned tendon is considered, an average uniform stress is there in the tendon. Opposite to this, stress in a tendon wire in a pre-tensioned member varies along the length of the tendon due to its bond with concrete. It can be understood at the outset that the normal variations encountered in practice do not exceed the normal tolerances expected in structural design.