Failure modes of prestressed CFRP rods in a wedge anchored set-up

Anders Bennitz, Jacob Wittrup Schmidt, Björn Täljsten

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


In the process of developing a new wedge anchorage to anchor prestressed CFRP rods, five different anchorage designs were manufactured. These designs have led to a constantly increased ultimate failure load of the prestressing system and an eventual load level above 95% of the ultimate failure load of the rod was achieved. If 100% efficiency is achieved the anchorage does not reduce the capacity of the system, but failure is then governed by the capacity of the rod itself, which is considered favourable and required by several guidelines. In the process seven different failure modes were identified: soft slip, power slip, cutting of fibres, crushing of rod, bending of fibres, frontal overload and intermediate rupture. In this paper the failure modes are discussed further. The failures are documented with explanatory figures and their backgrounds are found in the theory. Suggestions are given on how these failures can be avoided in theory and practice. From the experiences gained in the project, it is concluded that it is a challenging task to create a fully mechanical anchorage for CFRP tendons and that the failure margins are small between a successful and an unsuccesful anchorage system.
Original languageEnglish
Title of host publicationAdvanced composites in construction 2009 : Conference proceedings
Publication date2009
Publication statusPublished - 2009
Event4th International Conference on Advanced Composites in Conctruction - University of Edinburgh, Edinburgh, United Kingdom
Duration: 1 Sep 20093 Sep 2009
Conference number: 4


Conference4th International Conference on Advanced Composites in Conctruction
LocationUniversity of Edinburgh
Country/TerritoryUnited Kingdom
Internet address


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