Abstract
The present work aims to provide an in-situ inspection methodology for prestressed concrete bridges with post-tensioned cables (PT bridges). The adoption of non-destructive techniques (NDT), already widely employed in other engineering fields, is proposed, providing reliable information with a relatively low impact on the existing infrastructure. For each of the specific inspection topics (i.e. cables’ layout detection, defect localization and quantification, estimation of residual prestressing force) the proposed investigation procedure was calibrated through a deep experimental test campaign, including both laboratory tests – planned and performed to validate the method and check its efficiency and reliability – and applications to existing viaducts located on the Italian highways.
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