Influence of axial force and corrosion on failure of prestressed concrete structures considering M-V interaction
| Autor: | Marcello Arici, Michele Fabio Granata, Giovanni Culotta, Antonino Recupero |
|---|---|
| Přispěvatelé: | Granata, Michele Fabio, Recupero, Antonino, Culotta, Giovanni, Arici, Marcello |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Bending Interaction Prestressing 0211 other engineering and technologies Bonded tendon 020101 civil engineering 02 engineering and technology Bonded tendons Corroded structures Polcevera viaduct Shear Unbonded cables 0201 civil engineering Deck law.invention Corrosion Stress (mechanics) Prestressed concrete law Corroded structure 021105 building & construction Civil and Structural Engineering Shrinkage Tension (physics) business.industry Structural engineering Creep business |
| Popis: | Existing prestressed concrete structures suffer from degradation of prestressing for two main reasons: a defect of the sheath infills (cement grout) of bonded tendons, and corrosion of steel strands. These two causes, often concomitant, lead to a reduction over time of the effectiveness of initial prestressing, in addition to the ordinary tension losses due to concrete shrinkage and creep, and to steel relaxation. In many cases a consequence of bad grouting in bonded tendons is that the structure shows an intermediate behavior between that of external prestressing and that of internal bonded prestressing. This, added to damage to wires due to corrosion, makes it essential for the designer to be able to check sections of existing structures considering the interaction between the characteristics of the stress together with the changing state of tendons. In this paper a methodology for performing safety checks through M-V interaction domains with axial force N due to prestressing and external loads in the structural scheme is presented. The modification of the behavior between the intact and the degraded section due to corrosion and the consequences of bond loss are shown and discussed together with the influence of compressive axial force due to the structural scheme. Finally, an application is proposed on an emblematic case study: the deck sections of the Polcevera viaduct in Genoa. |
| Databáze: | OpenAIRE |
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