Characterization of GFRP bars and couplers for prestressed concrete

Nafiseh Kiani, Marco Rossini, Antonio Nanni

Research output: Contribution to conferencePaperpeer-review


Glass fiber-reinforced polymer (GFRP) bars have significant potential in prestressed concrete (PC) applications. Recent technical literature indicates that the creep rupture threshold for state-of-the-practice GFRP bars can be higher than 40% of their guaranteed tensile strength, thus allowing a sufficient level of tensioning at the time of construction. To develop field-deployable systems for PC elements with particular focus on partially-prestressed applications (i.e., combination of tensioned and non-tensioned reinforcement), an experimental investigation was conducted. This paper reports on the mechanical properties and behavior of two different GFRP bar diameters, an anchorage system that uses polymeric wedges, and a bar splicing solution that may be necessary to meet the length of conventional prestressing beds. Experimental results obtained in this study support the use of GFRP bars in PC elements. The composites investigated in this study were deployed in the construction of two partially-prestressed piles serving as a real-case demonstrator for the viability of GFRP prestressing in substructure applications.

Original languageEnglish (US)
StatePublished - 2020
Externally publishedYes
Event7th Composites and Advanced Materials Expo, CAMX 2020 - Virtual, Online
Duration: Sep 21 2020Sep 24 2020


Conference7th Composites and Advanced Materials Expo, CAMX 2020
CityVirtual, Online


  • GFRP bars
  • GFRP splicing
  • Mechanical couplers
  • Prestressed concrete
  • Wedge anchors

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Aerospace Engineering
  • Industrial and Manufacturing Engineering
  • Mechanics of Materials
  • Materials Science(all)


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