• bonding defect
• difetti di iniezione
• monitoring system
• precompresso
• prestressed
• sistema di monitoraggio

Ponti e viadotti in cemento armato precompresso a cavi post-tesi sono strutture particolarmente sensibili ai fenomeni di degrado, soprattutto in riferimento alla corrosione dei cavi di precompressione che può portare a collassi improvvisi anche in assenza di carichi di esercizio. Difetti di iniezione dei cavi possono rappresentare pericolosi punti di innesco per la corrosione. Le ispezioni visive non sono sufficienti a valutare il reale stato di conservazione delle armature post-tese, per cui sono necessarie tecniche diagnostiche “speciali”, le quali forniscono una valutazione statica dello stato di fatto dell’opera. Sistemi di monitoraggi, vengono utilizzati ter un controllo continuo dell’opera fornendo informazioni in tempo reale sullo stato deformativo. Questa tesi si inserisce in un progetto di ricerca mirato a valutare l'efficacia del sistema di monitoraggio per la localizzazione dei difetti in un impalcato in c.a.p. a cavi post-tesi. L'obiettivo è creare un metodo implementabile in chiave parametrica, qui esposto nella sua fase preliminare, basato sull’elaborazione dei dati forniti dal sistema di monitoraggio, che possa essere a sostegno delle indagini speciali e mirato alla localizzazione del danno ed alla sua evoluzione nel tempo. La validità del modello è supportata da simulazioni numeriche agli elementi finiti.

Post-tensioned cable prestressed concrete bridges and viaducts are structures that are particularly susceptible to degradation phenomena, especially with regard to corrosion of the prestressing cables, which can lead to sudden collapses even in the absence of operating loads. Defects in cable injection can be dangerous trigger points for corrosion. Visual inspections are not sufficient to assess the real state of preservation of the post-tensioned reinforcement, so ‘special’ diagnostic techniques are required, which provide a static assessment of the state of the structure. Monitoring systems, are used ter a continuous control of the work by providing real time information on the deformation state. This thesis is part of a research project aimed at evaluating the effectiveness of the monitoring system for locating defects in a post-tensioned prestressed concrete cable deck. The aim is to create a parametrically implementable method, shown here in its preliminary phase, based on the processing of the data provided by the monitoring system, which can support special investigations and is aimed at locating the damage and its evolution over time. The validity of the model is supported by numerical finite element simulations.

Post-tensioned cable prestressed concrete bridges and viaducts are structures that are particularly susceptible to degradation phenomena, especially with regard to corrosion of the prestressing cables, which can lead to sudden collapses even in the absence of operating loads. Defects in cable injection can be dangerous trigger points for corrosion. Visual inspections are not sufficient to assess the real state of preservation of the post-tensioned reinforcement, so ‘special’ diagnostic techniques are required, which provide a static assessment of the state of the structure. Monitoring systems, are used ter a continuous control of the work by providing real time information on the deformation state. This thesis is part of a research project aimed at evaluating the effectiveness of the monitoring system for locating defects in a post-tensioned prestressed concrete cable deck. The aim is to create a parametrically implementable method, shown here in its preliminary phase, based on the processing of the data provided by the monitoring system, which can support special investigations and is aimed at locating the damage and its evolution over time. The validity of the model is supported by numerical finite element simulations.