Shear Code Provisions Applied to the Prediction of FRP Strengthened Prestressed I-Girders

Yaqub M. A., Matthys S., Czaderski C.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.436-448 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_37
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.436-448
  • Keywords: FRP, I-girders, Prestressed concrete, Shear strengthening, Predictive models
  • Istanbul Technical University Affiliated: No


Shear strength contribution of concrete, steel and FRP in case of strengthened prestressed I-girders is not well defined in the literature. Analytical design and prediction models give a lot of variation compared to the experimental observations. The suitability and effectiveness of analytical models in case of strengthened prestressed I-girders is an open research question. This paper compares the shear strength prediction based on the analytical models given in different codes or guidelines, when applied to FRP strengthened prestressed I-girders. This is benchmarked against a small experimental dataset taken from literature. It is concluded that the available design guidelines are not able to predict the shear strength of FRP strengthened prestressed I-girders. FRP shear contribution models derived for rectangular cross sections fail to capture the phenomenon of early debonding around the internal angles of the I-section and cannot be used for complex sectional geometries. The results reported in this paper are part of a wider study to investigate anchored FRP shear strengthening configurations, to avoid local de-bonding at the concave zones of complex cross-sections such as I-girders.