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

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 proceeding › Conference 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 language	English
Title of host publication	Composites in Civil Engineering, CICE 2006
Editors	Amir Mirmiran, Antonio Nanni
Publisher	International Institute for FRP in Construction (IIFC)
Pages	39-42
Number of pages	4
ISBN (Electronic)	0615135862, 9780615135861
Publication status	Published - 2020
Externally published	Yes
Event	3rd International Conference on Composites in Civil Engineering, CICE 2006 - Miami, United States Duration: 2006 Dec 13 → 2006 Dec 15

Publication series

Name	Composites in Civil Engineering, CICE 2006

Conference

Conference	3rd International Conference on Composites in Civil Engineering, CICE 2006
Country/Territory	United States
City	Miami
Period	06/12/13 → 06/12/15

Keywords

Adhesive bonding
Bond configuration
FRP
Flexural strengthening

ASJC Scopus subject areas

Surfaces and Interfaces

Cite this

Effects of bond configurations on flexural response of RC beams externally strengthened with CFRP sheets. / Dai, Jianguo; Sumiyoshi, Keisuke; Ueda, Tamon et al.
Composites in Civil Engineering, CICE 2006. ed. / Amir Mirmiran; Antonio Nanni. International Institute for FRP in Construction (IIFC), 2020. p. 39-42 (Composites in Civil Engineering, CICE 2006).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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. Composites in Civil Engineering, CICE 2006, International Institute for FRP in Construction (IIFC), pp. 39-42, 3rd International Conference on Composites in Civil Engineering, CICE 2006, Miami, United States, 06/12/13.

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N2 - 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.

AB - 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.

KW - Adhesive bonding

KW - Bond configuration

KW - FRP

KW - Flexural strengthening

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ER -

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

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

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