Shear strengthening of RC beams with FRP grid-reinforced ECC matrix

Xu Yang; Wan-Yang Gao; Jian-Guo Dai; Zhou-Dao Lu

doi:10.1016/j.compstruct.2020.112120

Shear strengthening of RC beams with FRP grid-reinforced ECC matrix

Xu Yang, Wan-Yang Gao^*, Jian-Guo Dai, Zhou-Dao Lu

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

121 Citations (Scopus)

Abstract

Fabric reinforced cementitious matrix (FRCM) composites are increasingly used for flexural and shear strengthening of reinforced concrete (RC) beams. This paper presents the results from an experimental study on the effectiveness and performance of a new FRCM system made of FRP grid-reinforced ECC matrix (referred to as “FGREM” for brevity) for shear strengthening of RC beams. A total of twelve shear-critical RC beams were constructed and tested. The parameters varied between the tests included the type of FRP grids, the type of cementitious matrix, the installation method of the shear strengthening system (prefabricated or cast-in-place), and the shear span-to-depth ratio of the beams. The crack patterns of all the tested beams were monitored using the digital image correlation (DIC) technique. Test results indicated that interfacial debonding of the shear strengthening layer and separation of the concrete side covers were two typical failure modes for the beams strengthened with the cast-in-place method and the prefabricated method, respectively. The gains in the shear capacity of the strengthened beams ranged from 50.9% to 160.6% with respect to the reference beams. Compared to the cast-in-place installation method, the prefabricated FGREM was demonstrated to be more efficient for shear strengthening of the RC beams. © 2020 Elsevier Ltd.

Original language	English
Article number	112120
Journal	Composite Structures
Volume	241
Online published	25 Feb 2020
DOIs	https://doi.org/10.1016/j.compstruct.2020.112120
Publication status	Published - 1 Jun 2020
Externally published	Yes

Funding

The authors would like to acknowledge the financial support received from the National Natural Science Foundation of China (Project Nos. 51908373, 51978398 and 51278441), the Research Grants Council of Hong Kong (Project No. PolyU 5143/11E) and the Natural Science Foundation of Shanghai (Project No. 19ZR1426200). Special thanks go to Prof. Jian-Tao Yu for his help in laboratory work.

Research Keywords

Beam
Digital image correlation (DIC) technique
Engineered cementitious composite (ECC)
Fiber-reinforced polymer (FRP) grid
Reinforced concrete
Shear strengthening

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10.1016/j.compstruct.2020.112120

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title = "Shear strengthening of RC beams with FRP grid-reinforced ECC matrix",

abstract = "Fabric reinforced cementitious matrix (FRCM) composites are increasingly used for flexural and shear strengthening of reinforced concrete (RC) beams. This paper presents the results from an experimental study on the effectiveness and performance of a new FRCM system made of FRP grid-reinforced ECC matrix (referred to as “FGREM” for brevity) for shear strengthening of RC beams. A total of twelve shear-critical RC beams were constructed and tested. The parameters varied between the tests included the type of FRP grids, the type of cementitious matrix, the installation method of the shear strengthening system (prefabricated or cast-in-place), and the shear span-to-depth ratio of the beams. The crack patterns of all the tested beams were monitored using the digital image correlation (DIC) technique. Test results indicated that interfacial debonding of the shear strengthening layer and separation of the concrete side covers were two typical failure modes for the beams strengthened with the cast-in-place method and the prefabricated method, respectively. The gains in the shear capacity of the strengthened beams ranged from 50.9% to 160.6% with respect to the reference beams. Compared to the cast-in-place installation method, the prefabricated FGREM was demonstrated to be more efficient for shear strengthening of the RC beams. {\textcopyright} 2020 Elsevier Ltd.",

keywords = "Beam, Digital image correlation (DIC) technique, Engineered cementitious composite (ECC), Fiber-reinforced polymer (FRP) grid, Reinforced concrete, Shear strengthening",

author = "Xu Yang and Wan-Yang Gao and Jian-Guo Dai and Zhou-Dao Lu",

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T1 - Shear strengthening of RC beams with FRP grid-reinforced ECC matrix

AU - Yang, Xu

AU - Gao, Wan-Yang

AU - Dai, Jian-Guo

AU - Lu, Zhou-Dao

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Fabric reinforced cementitious matrix (FRCM) composites are increasingly used for flexural and shear strengthening of reinforced concrete (RC) beams. This paper presents the results from an experimental study on the effectiveness and performance of a new FRCM system made of FRP grid-reinforced ECC matrix (referred to as “FGREM” for brevity) for shear strengthening of RC beams. A total of twelve shear-critical RC beams were constructed and tested. The parameters varied between the tests included the type of FRP grids, the type of cementitious matrix, the installation method of the shear strengthening system (prefabricated or cast-in-place), and the shear span-to-depth ratio of the beams. The crack patterns of all the tested beams were monitored using the digital image correlation (DIC) technique. Test results indicated that interfacial debonding of the shear strengthening layer and separation of the concrete side covers were two typical failure modes for the beams strengthened with the cast-in-place method and the prefabricated method, respectively. The gains in the shear capacity of the strengthened beams ranged from 50.9% to 160.6% with respect to the reference beams. Compared to the cast-in-place installation method, the prefabricated FGREM was demonstrated to be more efficient for shear strengthening of the RC beams. © 2020 Elsevier Ltd.

AB - Fabric reinforced cementitious matrix (FRCM) composites are increasingly used for flexural and shear strengthening of reinforced concrete (RC) beams. This paper presents the results from an experimental study on the effectiveness and performance of a new FRCM system made of FRP grid-reinforced ECC matrix (referred to as “FGREM” for brevity) for shear strengthening of RC beams. A total of twelve shear-critical RC beams were constructed and tested. The parameters varied between the tests included the type of FRP grids, the type of cementitious matrix, the installation method of the shear strengthening system (prefabricated or cast-in-place), and the shear span-to-depth ratio of the beams. The crack patterns of all the tested beams were monitored using the digital image correlation (DIC) technique. Test results indicated that interfacial debonding of the shear strengthening layer and separation of the concrete side covers were two typical failure modes for the beams strengthened with the cast-in-place method and the prefabricated method, respectively. The gains in the shear capacity of the strengthened beams ranged from 50.9% to 160.6% with respect to the reference beams. Compared to the cast-in-place installation method, the prefabricated FGREM was demonstrated to be more efficient for shear strengthening of the RC beams. © 2020 Elsevier Ltd.

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KW - Digital image correlation (DIC) technique

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KW - Fiber-reinforced polymer (FRP) grid

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Shear strengthening of RC beams with FRP grid-reinforced ECC matrix

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