Shear behavior of RC beams strengthened with FRP grid reinforced engineered cementitious composites

Xu Yang; Jian-Guo Dai; Zhoudao Lu

Shear behavior of RC beams strengthened with FRP grid reinforced engineered cementitious composites

Xu Yang, Jian-Guo Dai^*, Zhoudao Lu

^*Corresponding author for this work

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

2 Citations (Scopus)

Abstract

Prefabricated carbon fibre-reinforced polymer (CFRP) grid-reinforced engineered cementitious composite (ECC) plates were used for the shear strengthening of reinforced concrete (RC) beams. In this strengthening system, ECC acted as the matrix material, CFRP grids were used as the reinforcement, and epoxy was used as the bonding agent between the CFRP-ECC plate and the concrete substrate. In total, four RC beams were tested, among which one was un-strengthened as the reference beam and three were shear strengthened with three different schemes: ECC, polymer-modified mortar and CFRP grid reinforced-ECC plate. It was found that the use of highly ductile ECC as the matrix of the strengthening layer could alleviate significantly the local interfacial bond stresses and avoid the debonding of the strengthening layer, which is a dominant failure observed in the traditional externally bonded FRP strengthening system. Instead, the failure mode was dominated by the side concrete cover separation, leading to a significant increase of the shear capacity of the RC beam by 124%. The experimental results have proven the high efficiency of the proposed shear strengthening method. © 2017 APFIS.

Original language	English
Title of host publication	PROCEEDINGS OF THE 6^th ASIA-PACIFIC CONFERENCE ON FRP IN STRUCTURES, APFIS 2017
Pages	122-141
Publication status	Published - Jul 2017
Externally published	Yes
Event	6th Asia-Pacific Conference on FRP in Structures (APFIS 2017) - , Singapore Duration: 19 Jul 2017 → 21 Jul 2017 https://www.iifc.org/publications-resources/proceedings/ http://ddl.escience.cn/f/M8NU

Conference

Conference	6th Asia-Pacific Conference on FRP in Structures (APFIS 2017)
Abbreviated title	APFIS2017
Place	Singapore
Period	19/07/17 → 21/07/17
Internet address	https://www.iifc.org/publications-resources/proceedings/ http://ddl.escience.cn/f/M8NU

Funding

The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Programs Nos. 51478406 and 51278441), Research Grants Council of the Hong Kong SAR (Project Code: PolyU 5145/13E) for providing funds for this research work.

Research Keywords

Cement-based bonding
CFRP grid
ECC
RC beams
Shear strengthening

RGC Funding Information

RGC-funded

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@inproceedings{1ee71d9a376640aea9fa72d5aaee81a2,

title = "Shear behavior of RC beams strengthened with FRP grid reinforced engineered cementitious composites",

abstract = "Prefabricated carbon fibre-reinforced polymer (CFRP) grid-reinforced engineered cementitious composite (ECC) plates were used for the shear strengthening of reinforced concrete (RC) beams. In this strengthening system, ECC acted as the matrix material, CFRP grids were used as the reinforcement, and epoxy was used as the bonding agent between the CFRP-ECC plate and the concrete substrate. In total, four RC beams were tested, among which one was un-strengthened as the reference beam and three were shear strengthened with three different schemes: ECC, polymer-modified mortar and CFRP grid reinforced-ECC plate. It was found that the use of highly ductile ECC as the matrix of the strengthening layer could alleviate significantly the local interfacial bond stresses and avoid the debonding of the strengthening layer, which is a dominant failure observed in the traditional externally bonded FRP strengthening system. Instead, the failure mode was dominated by the side concrete cover separation, leading to a significant increase of the shear capacity of the RC beam by 124%. The experimental results have proven the high efficiency of the proposed shear strengthening method. {\textcopyright} 2017 APFIS.",

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author = "Xu Yang and Jian-Guo Dai and Zhoudao Lu",

year = "2017",

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language = "English",

pages = "122--141",

booktitle = "PROCEEDINGS OF THE 6th ASIA-PACIFIC CONFERENCE ON FRP IN STRUCTURES, APFIS 2017",

note = "6th Asia-Pacific Conference on FRP in Structures (APFIS 2017), APFIS2017 ; Conference date: 19-07-2017 Through 21-07-2017",

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}

Shear behavior of RC beams strengthened with FRP grid reinforced engineered cementitious composites. / Yang, Xu; Dai, Jian-Guo; Lu, Zhoudao.
PROCEEDINGS OF THE 6^th ASIA-PACIFIC CONFERENCE ON FRP IN STRUCTURES, APFIS 2017. 2017. p. 122-141.

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - Shear behavior of RC beams strengthened with FRP grid reinforced engineered cementitious composites

AU - Yang, Xu

AU - Dai, Jian-Guo

AU - Lu, Zhoudao

PY - 2017/7

Y1 - 2017/7

N2 - Prefabricated carbon fibre-reinforced polymer (CFRP) grid-reinforced engineered cementitious composite (ECC) plates were used for the shear strengthening of reinforced concrete (RC) beams. In this strengthening system, ECC acted as the matrix material, CFRP grids were used as the reinforcement, and epoxy was used as the bonding agent between the CFRP-ECC plate and the concrete substrate. In total, four RC beams were tested, among which one was un-strengthened as the reference beam and three were shear strengthened with three different schemes: ECC, polymer-modified mortar and CFRP grid reinforced-ECC plate. It was found that the use of highly ductile ECC as the matrix of the strengthening layer could alleviate significantly the local interfacial bond stresses and avoid the debonding of the strengthening layer, which is a dominant failure observed in the traditional externally bonded FRP strengthening system. Instead, the failure mode was dominated by the side concrete cover separation, leading to a significant increase of the shear capacity of the RC beam by 124%. The experimental results have proven the high efficiency of the proposed shear strengthening method. © 2017 APFIS.

AB - Prefabricated carbon fibre-reinforced polymer (CFRP) grid-reinforced engineered cementitious composite (ECC) plates were used for the shear strengthening of reinforced concrete (RC) beams. In this strengthening system, ECC acted as the matrix material, CFRP grids were used as the reinforcement, and epoxy was used as the bonding agent between the CFRP-ECC plate and the concrete substrate. In total, four RC beams were tested, among which one was un-strengthened as the reference beam and three were shear strengthened with three different schemes: ECC, polymer-modified mortar and CFRP grid reinforced-ECC plate. It was found that the use of highly ductile ECC as the matrix of the strengthening layer could alleviate significantly the local interfacial bond stresses and avoid the debonding of the strengthening layer, which is a dominant failure observed in the traditional externally bonded FRP strengthening system. Instead, the failure mode was dominated by the side concrete cover separation, leading to a significant increase of the shear capacity of the RC beam by 124%. The experimental results have proven the high efficiency of the proposed shear strengthening method. © 2017 APFIS.

KW - Cement-based bonding

KW - CFRP grid

KW - ECC

KW - RC beams

KW - Shear strengthening

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M3 - RGC 32 - Refereed conference paper (with host publication)

AN - SCOPUS:85084944126

SP - 122

EP - 141

BT - PROCEEDINGS OF THE 6th ASIA-PACIFIC CONFERENCE ON FRP IN STRUCTURES, APFIS 2017

T2 - 6th Asia-Pacific Conference on FRP in Structures (APFIS 2017)

Y2 - 19 July 2017 through 21 July 2017

ER -

Shear behavior of RC beams strengthened with FRP grid reinforced engineered cementitious composites

Abstract

Conference

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Research Keywords

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