Prestressing systems for strengthening of concrete and metallic structures: recent developments at EMPA, Switzerland

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Authors

  • M. Motavalli
  • E. Ghafoori
  • M. Shahverdi
  • J. Michels
  • C. Czaderski

External Research Organisations

  • Swiss Federal Laboratories for Material Science and Technology (EMPA)
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Details

Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
EditorsJ.G. Dai, J.G. Teng
Pages1118-1125
Number of pages8
ISBN (electronic)9789881448026
Publication statusPublished - 2016
Externally publishedYes
Event8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 - Hong Kong, China
Duration: 14 Dec 201616 Dec 2016

Publication series

NameProceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016

Abstract

Carbon fiber reinforced polymer (CFRP) materials have been used for strengthening of concrete and metallic structures. There are several differences between the behavior of bonded joints in CFRP-strengthened concrete and metallic members. One of the main differences between CFRP–concrete and CFRP–metal bonded joints is that in the latter, failure will likely occur in the adhesive layer and in the former failure is expected to occur in the concrete. Furthermore, in the concrete girders, cracks are often initiated at low load levels in the tension face, and the bonded CFRP strip tries to close the crack, and consequently increase the stiffness and cracking load. Nevertheless, metallic girders do not crack even after yielding and the effect of having adhesive between the CFRP laminate and steel substrate is limited to transferring the shear stresses from the steel substrate to the CFRP laminate along the connection. Because of these differences, the strengthening concepts for steel and concrete are different, and, therefore, different CFRP prestressing systems are required. This paper provides a short review for different CFRP retrofit systems that have been recently developed at Empa for concrete and metallic members. Details about strengthening of a concrete and a metallic bridge using prestressed CFRP strips are given. At the end, a novel pre-stressing system, which is based on iron-based shape memory alloy (Fe-SMA), is presented.

Keywords

    Carbon-fiber-reinforced polymer (CFRP), Iron-based shape memory alloy (FE-SMA), Prestressing, Reinforced concrete, Steel structures, Strengthening

ASJC Scopus subject areas

Cite this

Prestressing systems for strengthening of concrete and metallic structures: recent developments at EMPA, Switzerland. / Motavalli, M.; Ghafoori, E.; Shahverdi, M. et al.
Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016. ed. / J.G. Dai; J.G. Teng. 2016. p. 1118-1125 (Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016).

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Motavalli, M, Ghafoori, E, Shahverdi, M, Michels, J & Czaderski, C 2016, Prestressing systems for strengthening of concrete and metallic structures: recent developments at EMPA, Switzerland. in JG Dai & JG Teng (eds), Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016. Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016, pp. 1118-1125, 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016, Hong Kong, China, 14 Dec 2016.
Motavalli, M., Ghafoori, E., Shahverdi, M., Michels, J., & Czaderski, C. (2016). Prestressing systems for strengthening of concrete and metallic structures: recent developments at EMPA, Switzerland. In J. G. Dai, & J. G. Teng (Eds.), Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 (pp. 1118-1125). (Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016).
Motavalli M, Ghafoori E, Shahverdi M, Michels J, Czaderski C. Prestressing systems for strengthening of concrete and metallic structures: recent developments at EMPA, Switzerland. In Dai JG, Teng JG, editors, Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016. 2016. p. 1118-1125. (Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016).
Motavalli, M. ; Ghafoori, E. ; Shahverdi, M. et al. / Prestressing systems for strengthening of concrete and metallic structures : recent developments at EMPA, Switzerland. Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016. editor / J.G. Dai ; J.G. Teng. 2016. pp. 1118-1125 (Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016).
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abstract = "Carbon fiber reinforced polymer (CFRP) materials have been used for strengthening of concrete and metallic structures. There are several differences between the behavior of bonded joints in CFRP-strengthened concrete and metallic members. One of the main differences between CFRP–concrete and CFRP–metal bonded joints is that in the latter, failure will likely occur in the adhesive layer and in the former failure is expected to occur in the concrete. Furthermore, in the concrete girders, cracks are often initiated at low load levels in the tension face, and the bonded CFRP strip tries to close the crack, and consequently increase the stiffness and cracking load. Nevertheless, metallic girders do not crack even after yielding and the effect of having adhesive between the CFRP laminate and steel substrate is limited to transferring the shear stresses from the steel substrate to the CFRP laminate along the connection. Because of these differences, the strengthening concepts for steel and concrete are different, and, therefore, different CFRP prestressing systems are required. This paper provides a short review for different CFRP retrofit systems that have been recently developed at Empa for concrete and metallic members. Details about strengthening of a concrete and a metallic bridge using prestressed CFRP strips are given. At the end, a novel pre-stressing system, which is based on iron-based shape memory alloy (Fe-SMA), is presented.",
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