Size effect in RC beams shear-strengthened with FRP

W. N. Liu, P. Y. Zhou, G. M. Chen, J. G. Teng, J. F. Chen

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Existing research has shown that externally bonded fibre-reinforced polymer (FRP) reinforcement is an effective shear strengthening technique for reinforced concrete (RC) beams. One issue that has not been properly clarified by existing research is the size effect in RC beams shear-strengthened with FRP. Most of the existing experimental studies have been carried out on beams of small/medium size (e.g., with a beam height < 0.45m) and most of the existing shear strength models have been developed and substantiated using the test results of such small/medium-size beams. This paper presents the test results of 18 beams in 3 series corresponding to three different beam heights respectively: 300 mm, 600mm and 900 mm. Each series consisted of 6 beams, including a group of 3 beams with steel stirrups and another group of 3 beams without steel stirrups. Each group had 3 beams: an RC beam without strengthening (control specimen), a beam shear-strengthened with FRP U-strips, and a beam shear-strengthened with FRP full wraps. All the 18 beams had a shear span-to-depth ratio of 3.0. The test results showed that a significant size effect exists in RC beams shear-strengthened with FRP U-strips while the size effect is minimal when FRP full wraps are used. The test results also demonstrated that significant shear interactions exist among the different components (concrete, steel and FRP) of an FRP-strengthened RC beam.

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
PublisherDepartment of Civil and Environmental Engineering and Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University
Pages402-407
Number of pages6
ISBN (Electronic)9789881448026
Publication statusPublished - 1 Jan 2016
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

Conference

Conference8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
CountryChina
CityHong Kong
Period14/12/1616/12/16

Keywords

  • FRP
  • Full wraps
  • RC beams
  • Shear interaction
  • Shear strength
  • Size effect
  • Strengthening
  • U-strips

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Polymers and Plastics

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