Final answer:
The statement that stress losses are greater in posttensioned members than in pre-tensioned ones is generally false, as stress loss factors vary and do not necessarily depend on the tensioning method.
Step-by-step explanation:
The statement in posttensioned members, the losses of stress is more than pre-tensioned is generally considered false. In posttensioned systems, the tension is applied to the tendons after the concrete has hardened, whereas in pre-tensioned systems, the tension is applied before the concrete is poured. The main sources of stress losses in both posttensioned and pre-tensioned systems include elastic shortening, creep, shrinkage, and relaxation of steel. These loss factors can vary depending on the specific conditions and materials used in construction, but there isn't a consistent agreement that posttensioned systems inherently have more stress loss than pre-tensioned systems.
Tensile strength is the breaking stress that will cause permanent deformation or fracture of a material, and this principle is relevant to understanding how posttensioned and pre-tensioned systems operate. Additionally, tensile stress is not uniform along the length of the member due to various factors such as the weight of the rod, loading conditions, and the geometry of the system.