Effects of bond configurations on flexural response of RC beams externally strengthened with CFRP sheets

Jianguo Dai, Keisuke Sumiyoshi, Tamon Ueda, Hiroshi Yokota, Yasuhiko Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper investigates experimentally how various bond configurations influence the flexural response of FRP-strengthened RC beams. A total of seven beams(200×200×2200mm) were tested. One was the reference without strengthening. Two were strengthened with CFRP sheets using hard and soft adhesive bonding, respectively, along the whole test span. The remaining four were applied a combination of hard and soft adhesives but in two different ways. One way is to use the soft adhesive at the flexure-dominating zone only and another is to use it for the shear-dominating zone only. Pair tests were conducted for these four specimens under both normal and low temperature (- 10°C). It is revealed that a sole use of soft adhesive improves the ultimate member strength and ductility but leads to a loss of stiffness. Using the soft adhesive at the flexure-dominating zone can not improve the member strength but improve the member ductility only. However, use of hard adhesive at the flexure-dominating zone and the soft one for the remaining parts can improve the member strength and ductility while avoiding loss of member stiffness. This test program provides an in-depth understanding of the debonding mechanisms in the FRP-strengthened RC beams. In addition, it is verified that that a low temperature of -10°C does not influence the global flexural response of FRP strengthened beams using the combined bonding system.

Original languageEnglish
Title of host publicationComposites in Civil Engineering, CICE 2006
EditorsAmir Mirmiran, Antonio Nanni
PublisherInternational Institute for FRP in Construction (IIFC)
Pages39-42
Number of pages4
ISBN (Electronic)0615135862, 9780615135861
Publication statusPublished - 2020
Event3rd International Conference on Composites in Civil Engineering, CICE 2006 - Miami, United States
Duration: 2006 Dec 132006 Dec 15

Publication series

NameComposites in Civil Engineering, CICE 2006

Conference

Conference3rd International Conference on Composites in Civil Engineering, CICE 2006
CountryUnited States
CityMiami
Period06/12/1306/12/15

Keywords

  • Adhesive bonding
  • Bond configuration
  • FRP
  • Flexural strengthening

ASJC Scopus subject areas

  • Surfaces and Interfaces

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  • Cite this

    Dai, J., Sumiyoshi, K., Ueda, T., Yokota, H., & Sato, Y. (2020). Effects of bond configurations on flexural response of RC beams externally strengthened with CFRP sheets. In A. Mirmiran, & A. Nanni (Eds.), Composites in Civil Engineering, CICE 2006 (pp. 39-42). (Composites in Civil Engineering, CICE 2006). International Institute for FRP in Construction (IIFC).