An innovative wide-ranging analytical approach for modelling the bond behaviour of frp-to-substrate joints with an elastic end anchorage

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number110662
Journal / PublicationEngineering Fracture Mechanics
Volume313
Online published17 Nov 2024
Publication statusPublished - 23 Jan 2025

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Abstract

Fibre-reinforced polymers (FRP) are often externally bonded (EB) to concrete, steel or timber structures for structural strengthening purposes. In the EB reinforcement system, the bond between materials is critical for the success of such a bonding system. However, the system is prone to debond at an FRP strain level much lower than its rupture value. For this reason, it is often necessary to use end anchorages in FRP-strengthened beams to delay or avoid this premature debonding of FRP from the beams. To better understand the debonding process of mechanically anchored FRP-to-substrate joints, the present work proposes a new analytical approach that considers an elastic end anchorage, which can simulate, through a spring, the slips developed in an end anchorage such as an FRP U-wrap jacket, FRP spike anchor, steel plate anchorage, among others. This new approach can also simulate the bond performance of FRP-to-substrate joints with no end anchorages by assuming that the stiffness of the end anchorage is zero. Expressions for defining the load-slip curves, FRP strains, interfacial slips, and bond stresses developed throughout the bonded length are derived and validated against the results from the Finite Element Analysis (FEA). In the end, the model was used to simulate several experimental tests on mechanically anchored FRP-to-substrate joints available in the literature. Despite its simplicity, the proposed analytical approach covers wider situations that no other known similar approach can deal with. © 2024 The Author(s)

Research Area(s)

  • Analytical approach, Anchorages, Debonding, FRP composites, Single-lap shear test

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