Strength Model for Debonding Failure in RC Beams Flexurally Strengthened with NSM FRP and Anchored with FRP U-Jackets

Ke, Y; Shi, FL; Zhang, SS; Nie, XF; Li, WG

Strength Model for Debonding Failure in RC Beams Flexurally Strengthened with NSM FRP and Anchored with FRP U-Jackets

Ke, Y Shi, FL Zhang, SS Nie, XF Li, WG

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Publisher:: American Society of Civil Engineers (ASCE)
Publication Type:: Journal Article
Citation:: Journal of Composites for Construction, 2023, 27, (5), pp. 04023038
Issue Date:: 2023-10-01

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Field	Value	Language
dc.contributor.author	Ke, Y
dc.contributor.author	Shi, FL
dc.contributor.author	Zhang, SS
dc.contributor.author	Nie, XF
dc.contributor.author	Li, WG
dc.date.accessioned	2024-05-10T12:04:41Z
dc.date.available	2024-05-10T12:04:41Z
dc.date.issued	2023-10-01
dc.identifier.citation	Journal of Composites for Construction, 2023, 27, (5), pp. 04023038
dc.identifier.issn	1090-0268
dc.identifier.issn	1943-5614
dc.identifier.uri	http://hdl.handle.net/10453/178819
dc.description.abstract	The flexural performance of reinforced concrete (RC) beams could be effectively improved by applying a near-surface mounted (NSM) fiber-reinforced polymer (FRP) at the beam soffit. However, such NSM FRP flexurally-strengthened beams frequently failed due to FRP debonding, which limited the full utilization of the FRP strength. In some experimental studies, FRP U-jackets have been used as the anchorage to mitigate or prevent debonding failures in NSM FRP flexurally-strengthened beams. These studies showed excellent anchoring performance of the FRP U-jackets. The authors recently developed a finite-element (FE) approach that could accurately predict the behavior of RC beams that had been flexurally strengthened with NSM FRP (NSM-strengthened beams), which were anchored with FRP U-jackets. Based on a parametric study that was undertaken, which used the simplified version of the FE approach, this paper proposed a strength model for the most common debonding failure mode in NSM-strengthened beams with FRP U-jackets. The proposed strength model consisted of an equation for the maximum NSM FRP strain (Ef) at debonding failure. Once the maximum FRP strain was known, the load-carrying capacity of the strengthened beam could be obtained through a section analysis. Comparing the predictions made by the proposed strength model with the test results showed that the proposed strength model could provide close predictions.
dc.language	en
dc.publisher	American Society of Civil Engineers (ASCE)
dc.relation.ispartof	Journal of Composites for Construction
dc.relation.isbasedon	10.1061/JCCOF2.CCENG-4215
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Civil Engineering
dc.subject.classification	4005 Civil engineering
dc.title	Strength Model for Debonding Failure in RC Beams Flexurally Strengthened with NSM FRP and Anchored with FRP U-Jackets
dc.type	Journal Article
utslib.citation.volume	27
utslib.for	0905 Civil Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
pubs.organisational-group	University of Technology Sydney/Strength - CGT - Centre for Green Technology
utslib.copyright.status	closed_access	*
dc.date.updated	2024-05-10T12:04:35Z
pubs.issue	5
pubs.publication-status	Published
pubs.volume	27
utslib.citation.issue	5

Abstract:

The flexural performance of reinforced concrete (RC) beams could be effectively improved by applying a near-surface mounted (NSM) fiber-reinforced polymer (FRP) at the beam soffit. However, such NSM FRP flexurally-strengthened beams frequently failed due to FRP debonding, which limited the full utilization of the FRP strength. In some experimental studies, FRP U-jackets have been used as the anchorage to mitigate or prevent debonding failures in NSM FRP flexurally-strengthened beams. These studies showed excellent anchoring performance of the FRP U-jackets. The authors recently developed a finite-element (FE) approach that could accurately predict the behavior of RC beams that had been flexurally strengthened with NSM FRP (NSM-strengthened beams), which were anchored with FRP U-jackets. Based on a parametric study that was undertaken, which used the simplified version of the FE approach, this paper proposed a strength model for the most common debonding failure mode in NSM-strengthened beams with FRP U-jackets. The proposed strength model consisted of an equation for the maximum NSM FRP strain (Ef) at debonding failure. Once the maximum FRP strain was known, the load-carrying capacity of the strengthened beam could be obtained through a section analysis. Comparing the predictions made by the proposed strength model with the test results showed that the proposed strength model could provide close predictions.

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http://hdl.handle.net/10453/178819