Verification of Actual Prestressing in Existing Pre-Tensioned Members

In the case of prestressed concrete structures, information about actual state prestressing is an important basis for determining their load-carrying capacity as well remaining service life. During life structure, initial level inevitably reduced a result actions various factors. These reductions force are considered prestress losses, which influenced by construction stages, used materials, technology, or required length Available standards enable determination expected values losses. Ultimately, calculation part design procedure every structure. However, aging and often neglected infrastructure in Europe also exposed to factors, such environmental distress, that not standard calculations. Therefore, verified reliable methods needed. This paper presents experimental program indirect method evaluation value seven sleepers. Particularly, non-destructive saw-cut pivotal object this study performed assessed. Furthermore, Barkhausen noise technique comparative method. Subsequently, campaign supported numerical analysis ATENA 3D software. Finally, experimentally determined residual compared according Eurocodes.