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Analytical and numerical modeling of innovative strengthening materials (Fiber Reinforced Polymer and Textile Reinforced Mortar) applied on brittle supports

Fiber Reinforced Polymer (FRP) composites and Textile Reinforced Mortar (TRM) materials represent an effective retrofitting strategy for the rehabilitation of masonry and concrete structures. Typically, debonding of an FRP strip from the substrate is a brittle phenomenon involving the support, with the removal of a thin layer of bricks and mortar, and roughly ruled by an initial linear elastic behaviour followed by marked softening, due to the detachment of the strip from the substrate. Several recent and less recent studies, mainly based on experimentation, sophisticated numerical modelling and theoretical approaches, just focus on this topic. The re-elaboration of the experiences collected on this topic allowed to conceive dedicated technical recommendations, as in Italy with the CNR DT 200 - technical code on FRP reinforcement applied to concrete and masonry.

The debate on the application of FRP composites in general and C-FRP in particular for the rehabilitation and seismic upgrading of historical masonry structures or existing buildings is however still open, some authors raising doubts on the long-term efficacy and cost of the intervention when compared with traditional techniques. The major drawback seems however related to the reversibility issue, which is nowadays considered a priority for any seismic upgrading with innovative materials.

In order to be consistent with such conservation requirement, part of the scientific efforts have been recently channelled to an alternative – appearing more reversible – innovative strengthening systems, such as Textile Reinforced Mortars TRMs. Apart from open issues related to reversibility, durability and vapour permeability of FRP strips, from a strictly structural point of view, the application of FRP on masonry walls and arches is certainly very interesting. The project focuses on the development of advanced analytical and numerical models of innovative reinforcement materials, such as Fiber Reinforced Polymers (FRP) and Textile Reinforced Mortars (TRM), to improve the adhesion of strengthening composites when applied to masonry.

The project offers a unique opportunity to carry out a high-quality research project in collaboration with several recognized universities, such as the Politecnico di Milano (Italy) and the University of Florence (Italy). The project will be coupled with experimental laboratory tests to enable the calibration and development of the advanced modelling approaches.

References:

  • State-of-the-art review and future research directions for FRP-to-masonry bond research: Test methods and techniques for extraction of bond-slip behaviour, J. Vaculik, P. Visintin, N.G. Burton, M.C. Griffith, R. Seracino, Construction and Building Materials, Volume 183, 2018.
  • State-of-the-art on strengthening of masonry structures with textile reinforced mortar (TRM), L. A. S. Kouris, T. C. Triantafillou, Construction and Building Materials, Volume 188, 2018.
  • Effectiveness of Textile Reinforced Mortar (TRM) materials for the repair of full-scale timbrel masonry cross vaults, E. Bertolesi, B.Torres, J. M. Adam, P. A. Calderón, J. J. Moragues, Engineering Structures, Volume 220, 2020.
  • Single lap shear tests of masonry curved pillars externally strengthened by CFRP strips, T. Rotunno, M. Fagone, E. Bertolesi, E. Grande, G. Milani, Composite Structures, Volume 200, 2018. 
  • Modelling of the bond behaviour of curved masonry specimens strengthened by CFRP with anchor spikes, E. Grande, M. Fagone, T. Rotunno, E. Bertolesi, G. Milani, Composites Part B: Engineering, Volume 171, 2019. 
  • Development of an interface numerical model for C-FRPs applied on flat and curved masonry pillars, G. Milani, M. Fagone, T. Rotunno, E. Grande, E. Bertolesi, Composite Structures, Volume 241, 2020.
  • Micro-mechanical FE numerical model for masonry curved pillars reinforced with FRP strips subjected to single lap shear tests, E. Bertolesi, G. Milani, M. Fagone, T. Rotunno, E. Grande, Composite Structures, Volume 201, 2018. -
  • FRP-strengthening of curved masonry structures: local Bond behavior and global response, E. Bertolesi, F. Fabbrocino, A. Formisano, E. Grande, G. Milani, Key Eng. Mater., Volume 747, 2017.
  • Heterogeneous FE model for single lap shear tests on FRP reinforced masonry curved pillars with spike anchors, E. Bertolesi, G. Milani, M. Fagone, T. Rotunno, E. Grande, Construction and Building Materials, Volume 258, 2020. -
  • The influence of the joint thickness on the adhesion between CFRP reinforcements and masonry arches, M. Fagone, T. Rotunno, E. Grande, E. Bertolesi, G. Milani, Procedia Struct Integr, Volume 11, 2018.
  • Curved masonry pillars reinforced with anchored CFRP sheets: An experimental analysis, T. Rotunno, M. Fagone, E. Bertolesi, E. Grande, G. Milani, Composites Part B: Engineering, Volume 174, 2019.

 

How to apply

If you are interested in applying for the above PhD topic please follow the steps below:

  1. Contact the supervisor by email or phone to discuss your interest and find out if you woold be suitable. Supervisor details can be found on this topic page. The supervisor will guide you in developing the topic-specific research proposal, which will form part of your application.
  2. Click on the 'Apply here' button on this page and you will be taken to the relevant PhD course page, where you can apply using an online application.
  3. Complete the online application indicating your selected supervisor and include the research proposal for the topic you have selected.

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This is a self funded topic

Brunel offers a number of funding options to research students that help cover the cost of their tuition fees, contribute to living expenses or both. See more information here: https://www.brunel.ac.uk/research/Research-degrees/Research-degree-funding. The UK Government is also offering Doctoral Student Loans for eligible students, and there is some funding available through the Research Councils. Many of our international students benefit from funding provided by their governments or employers. Brunel alumni enjoy tuition fee discounts of 15%.