Investigation of efficient anchorage systems for shear and torsion retrofitting of box girder bridges

Robin Kalfat, R. Al-Mahaidi, Grahme Williams

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Researchpeer-review

3 Citations (Scopus)


Carbon Fibre reinforced Polymers (CFRP) have become an effective solution to upgrade and strengthen existing box girder bridges in flexure, shear and torsion. The introduction of CFRP strain limitations to prevent premature delamination together with the increasing strengthening demands and the necessity for use of fibres of increasing stiffness and thickness has resulted in a very poor CFRP material utilisation levels achieved in practice. An effective method to increase CFRP material utilisation is by appropriately anchoring the ends of the CFRP. In this paper, a study into CFRP end anchorage solutions is presented which formed the basis of the experimental program. Both uni-directional and bi-directional fabric was applied to the ends of CFRP laminates and tested under direct shear loading. Uni-directional fabric was oriented both horizontally across and parallel to the direction of the laminate. In all cases it was found that the anchorages solutions tested resulted in a distribution of fibre-to-adhesive bond stresses over a greater length, width of concrete and could potentially result full CFRP utilisation and laminate rupture.

Original languageEnglish
Title of host publication10th International Symposium on Fiber-Reinforced Polymer Reinforcement for Concrete Structures 2011, FRPRCS-10
Subtitle of host publicationTampa, FL, United States; 2-4 April 2011
EditorsRajan Sen, Rudolf Seracino, Carol Shield, Will Gold
Place of PublicationFarmington Hills, MI, USA
PublisherAmerican Concrete Institute
Number of pages20
ISBN (Print)9781618392039
Publication statusPublished - 2011
EventInternational Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures 2011 - Tampa, United States of America
Duration: 2 Apr 20114 Apr 2011
Conference number: 10th

Publication series

NameAmerican Concrete Institute. Publication SP
PublisherAmerican Concrete Institute
ISSN (Print)0193-2527


ConferenceInternational Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures 2011
Abbreviated titleFRPRCS-10
Country/TerritoryUnited States of America
Otherin conjunction with the ACI Spring 2011 Convention


  • Anchorage
  • Bi-directional
  • Bond strength
  • CFRP
  • Concrete
  • Fabric
  • Strengthening
  • Uni-directional

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