Debonding in RC beams shear strengthened with complete FRP wraps: Fid-Bau Portal

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Debonding in RC beams shear strengthened with complete FRP wraps

Cao, S.Y. / Chen, J.F. / Teng, J.G. / Hao, Z. / Chen, J.

The strain (or stress) distribution in FRP (fiber reinforced polymer) along the critical shear crack is one of the key factors influencing the contribution of FRP to the ultimate shear capacity of FRP strengthened beams. Similarly, this is also expected to be one of the key factors influencing the contribution of FRP to the shear resistnace of the beam at the debonding of the critical FRP strip. Therefore, the emphasis of this study is on the development and distribution of strains in FRP strips intersected by the critical shear crack and the contribution of the FRP to the shear strength when debonding of FRP occurs. The chief conclusions derived from this study can be summarized as follows: The FRP strain distribution is nonuniform and needs to be taken into account in predicting the shear resistance contributed by the FRP through the use of a strain distribution factor. The strain distribution factor increases gradually with the increase of the applied load. It depends chiefly on the shear span-to-effective depth ratio. An increase of this ratio reduces the strain distribution factor. An empirical model has been proposed to predict the FRP contribution to the shear strength of RC (reinforced concrete) beams strengthened with complete FRP wraps at FRP debonding.

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Debonding in RC beams shear strengthened with complete FRP wraps

Cao, S.Y. / Chen, J.F. / Teng, J.G. / Hao, Z. / Chen, J.

The strain (or stress) distribution in FRP (fiber reinforced polymer) along the critical shear crack is one of the key factors influencing the contribution of FRP to the ultimate shear capacity of FRP strengthened beams. Similarly, this is also expected to be one of the key factors influencing the contribution of FRP to the shear resistnace of the beam at the debonding of the critical FRP strip. Therefore, the emphasis of this study is on the development and distribution of strains in FRP strips intersected by the critical shear crack and the contribution of the FRP to the shear strength when debonding of FRP occurs. The chief conclusions derived from this study can be summarized as follows: The FRP strain distribution is nonuniform and needs to be taken into account in predicting the shear resistance contributed by the FRP through the use of a strain distribution factor. The strain distribution factor increases gradually with the increase of the applied load. It depends chiefly on the shear span-to-effective depth ratio. An increase of this ratio reduces the strain distribution factor. An empirical model has been proposed to predict the FRP contribution to the shear strength of RC (reinforced concrete) beams strengthened with complete FRP wraps at FRP debonding.

Debonding in RC beams shear strengthened with complete FRP wraps

Cao, S.Y. / Chen, J.F. / Teng, J.G. / Hao, Z. / Chen, J.

The strain (or stress) distribution in FRP (fiber reinforced polymer) along the critical shear crack is one of the key factors influencing the contribution of FRP to the ultimate shear capacity of FRP strengthened beams. Similarly, this is also expected to be one of the key factors influencing the contribution of FRP to the shear resistnace of the beam at the debonding of the critical FRP strip. Therefore, the emphasis of this study is on the development and distribution of strains in FRP strips intersected by the critical shear crack and the contribution of the FRP to the shear strength when debonding of FRP occurs. The chief conclusions derived from this study can be summarized as follows: The FRP strain distribution is nonuniform and needs to be taken into account in predicting the shear resistance contributed by the FRP through the use of a strain distribution factor. The strain distribution factor increases gradually with the increase of the applied load. It depends chiefly on the shear span-to-effective depth ratio. An increase of this ratio reduces the strain distribution factor. An empirical model has been proposed to predict the FRP contribution to the shear strength of RC (reinforced concrete) beams strengthened with complete FRP wraps at FRP debonding.

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Title:

Debonding in RC beams shear strengthened with complete FRP wraps

Additional title:

Schichtablösung an vollständig FRP-ummantelten, scherfestigkeitsverstärkten RC-Trägern

Contributors:

Cao, S.Y. (author) / Chen, J.F. (author) / Teng, J.G. (author) / Hao, Z. (author) / Chen, J. (author)

Published in:

Journal of Composites for Construction ; 9 ; 417-428

Publication date:

2005

Size:

12 Seiten, 16 Bilder, 4 Tabellen, 38 Quellen

ISSN:

DOI:

https://doi.org/10.1061/(ASCE)1090-0268(2005)9:5(417)

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Träger (Bauwesen) , Stahlbeton , Ummantelung , faserverstärkter Kunststoff , Scherfestigkeit , Festigkeitserhöhung , Delaminierung (Schichtablösung) , Haftfestigkeit , Spannungsverteilung (mechanisch) , Dehnung unter Belastung , Riss , Scherbeanspruchung

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