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Effect of bond in the development length of CFRP pretensioned beams

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Incidents of severe corrosion in steel prestressing tendons have been reported in structural applications such as bridges. Steel corrosion can lead to high repair/maintenance costs (e.g. the Hammersmith Flyover bridge) and even to catastrophic brittle failures (e.g. Genoa Bridge 2018). Carbon Fibre Reinforced Polymer (CFRP) tendons present an alternative solution that can mitigate steel corrosion problems in concrete bridges due to their corrosion-free properties. The use of CFRP prestress tendons can result in more durable prestressed concrete structures. However, the potential matrix plasticisation of CFRP tendons in humid environments and their inherent lack of ductility need to be considered in the design process. The results of a tension stiffening analysis in a CFRP prestressed concrete beam are presented. The study considers the effect of variations in bond strength parameters on the cracking behaviour, deformability and structural performance of CFRP prestressed beams. The bond strength scenarios under consideration reflect either low or high bond conditions. The former could be associated with epoxy plasticisation and bond degradation due to moisture ingress at a crack location. A low bond performance results in a smaller number of cracks and higher deflections at failure compared with high bond tendons.

Eleni completed her PhD in the Concrete and Composite Structures group at the Engineering Department University of Cambridge in 2015 . The research project was on the Durability and bond performance of Carbon Fibre Reinforced Polymer (CFRP) tendons in high strength concrete in collaboration with the Swiss Federal Laboratories for Materials Science and Technology (EMPA in Zürich). After completing her PhD degree she worked as a Structural Engineer at Foster + Partners in an interdisciplinary design environment. Eleni joined the Natural Material Innovation (NMI) group in 2017 studying the mechanics of timber from micro- to macroscale in close collaboration with biochemists, chemists and fluid mechanical engineers. Her research focus on timber connections. The talk is related to her PhD work.

This talk is part of the Engineering Department Structures Research Seminars series.

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