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SUMMARY:Effect of bond in the development length of CFRP pretensioned beam
 s - Dr Eleni Toumpanaki\, CUED
DTSTART:20190524T140000Z
DTEND:20190524T143000Z
UID:TALK125155@talks.cam.ac.uk
CONTACT:Karen Mitchell
DESCRIPTION:Incidents of severe corrosion in steel prestressing tendons ha
 ve been reported in structural applications such as bridges. Steel corrosi
 on 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 s
 olution 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 pot
 ential matrix plasticisation of CFRP tendons in humid environments and the
 ir inherent lack of ductility need to be considered in the design process.
  The results of a tension stiffening analysis in a CFRP prestressed concre
 te beam are presented. The study considers the effect of variations in bon
 d strength parameters on the cracking behaviour\, deformability and struct
 ural performance of CFRP prestressed beams. The bond strength scenarios un
 der consideration reflect either low or high bond conditions. The former c
 ould be associated with epoxy plasticisation and bond degradation due to m
 oisture ingress at a crack location. A low bond performance results in a s
 maller number of cracks and higher deflections at failure compared with hi
 gh bond tendons.\n\nEleni 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 i
 n collaboration with the Swiss Federal Laboratories for Materials Science 
 and Technology (EMPA in Zürich). After completing her PhD degree she work
 ed as a Structural Engineer at Foster + Partners in an interdisciplinary d
 esign environment. Eleni joined the Natural Material Innovation (NMI) grou
 p in 2017 studying the mechanics of timber from micro- to macroscale in cl
 ose collaboration with biochemists\, chemists and fluid mechanical enginee
 rs. Her research focus on timber connections. The talk is related to her P
 hD work.\n\n\n
LOCATION: Cambridge University Engineering Department\, LT6
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