Innovative flexural strengthening of RC beams using self-anchored prestressed CFRP plates: Experimental and numerical investigations

•Self-anchored prestressed CFRP plates without the need for mechanical end anchorage.•Significant improvement in bending stiffness, crack width, and load-carrying capacity.•Nonlinear finite element analyses of flexural cracks and crack-induced debonding of CFRP plates. This paper presents an innovat...

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Veröffentlicht in:	Engineering structures Jg. 243; S. 112687
Hauptverfasser:	Yang, Jincheng, Johansson, Morgan, Al-Emrani, Mohammad, Haghani, Reza
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Kidlington Elsevier Ltd 15.09.2021 Elsevier BV
Schlagworte:	Anchorages Bearing strength Bonding strength Carbon fiber reinforced plastics Carbon fibre reinforced polymer (CFRP) Carrying capacity Debonding Fiber reinforced polymers Finite element method Flexural strengthening Intermediate crack-induced debonding Investigations Load carrying capacity Mechanical properties Model testing Nonlinear finite element analysis Plates Polymers Prestress Prestressing Reinforced concrete Reinforced concrete (RC) Self-anchorage Stiffness Strengthening Flexural strengthening Nonlinear finite element analysis Carbon fibre reinforced polymer (CFRP) Prestress Intermediate crack-induced debonding Self-anchorage Reinforced concrete (RC)
ISSN:	0141-0296, 1873-7323, 1873-7323
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Abstract	•Self-anchored prestressed CFRP plates without the need for mechanical end anchorage.•Significant improvement in bending stiffness, crack width, and load-carrying capacity.•Nonlinear finite element analyses of flexural cracks and crack-induced debonding of CFRP plates. This paper presents an innovative method of prestressing carbon fibre reinforced polymer (CFRP) plates used as externally bonded reinforcement for flexural strengthening of reinforced concrete (RC) beams. The proposed method aims to achieve self-anchorage of the prestressed CFRP plate and thus eliminate the need for conventional mechanical anchorage at its ends. Experimental tests of RC beams in four-point bending were conducted to investigate the strengthening efficiency of the self-anchored prestressed CFRP plate. The experimental results showed that using the self-anchored prestressed CFRP significantly improved the flexural performance of the strengthened beam in terms of bending stiffness, crack widths, and load-carrying capacity. The utilisation ratio of the prestressed CFRP plate reached 81% at its debonding. Numerical analyses using nonlinear finite element (FE) method were conducted to model the tested specimens. Based on the reliable simulation of flexural cracks and crack-induced CFRP debonding, parametric studies were conducted using FE analyses, in order to investigate the effect of prestressing levels and the CFRP plate’s stiffness on the flexural behaviour. Recommendations were then made for selecting a proper prestressing level and the mechanical properties of CFRP plates.
AbstractList	This paper presents an innovative method of prestressing carbon fibre reinforced polymer (CFRP) plates used as externally bonded reinforcement for flexural strengthening of reinforced concrete (RC) beams. The proposed method aims to achieve self-anchorage of the prestressed CFRP plate and thus eliminate the need for conventional mechanical anchorage at its ends. Experimental tests of RC beams in four-point bending were conducted to investigate the strengthening efficiency of the self-anchored prestressed CFRP plate. The experimental results showed that using the self-anchored prestressed CFRP significantly improved the flexural performance of the strengthened beam in terms of bending stiffness, crack widths, and load-carrying capacity. The utilisation ratio of the prestressed CFRP plate reached 81% at its debonding. Numerical analyses using nonlinear finite element (FE) method were conducted to model the tested specimens. Based on the reliable simulation of flexural cracks and crack-induced CFRP debonding, parametric studies were conducted using FE analyses, in order to investigate the effect of prestressing levels and the CFRP plate's stiffness on the flexural behaviour. Recommendations were then made for selecting a proper prestressing level and the mechanical properties of CFRP plates. •Self-anchored prestressed CFRP plates without the need for mechanical end anchorage.•Significant improvement in bending stiffness, crack width, and load-carrying capacity.•Nonlinear finite element analyses of flexural cracks and crack-induced debonding of CFRP plates. This paper presents an innovative method of prestressing carbon fibre reinforced polymer (CFRP) plates used as externally bonded reinforcement for flexural strengthening of reinforced concrete (RC) beams. The proposed method aims to achieve self-anchorage of the prestressed CFRP plate and thus eliminate the need for conventional mechanical anchorage at its ends. Experimental tests of RC beams in four-point bending were conducted to investigate the strengthening efficiency of the self-anchored prestressed CFRP plate. The experimental results showed that using the self-anchored prestressed CFRP significantly improved the flexural performance of the strengthened beam in terms of bending stiffness, crack widths, and load-carrying capacity. The utilisation ratio of the prestressed CFRP plate reached 81% at its debonding. Numerical analyses using nonlinear finite element (FE) method were conducted to model the tested specimens. Based on the reliable simulation of flexural cracks and crack-induced CFRP debonding, parametric studies were conducted using FE analyses, in order to investigate the effect of prestressing levels and the CFRP plate’s stiffness on the flexural behaviour. Recommendations were then made for selecting a proper prestressing level and the mechanical properties of CFRP plates.
ArticleNumber	112687
Author	Yang, Jincheng Johansson, Morgan Al-Emrani, Mohammad Haghani, Reza
Author_xml	– sequence: 1 givenname: Jincheng surname: Yang fullname: Yang, Jincheng organization: Division of Structural Engineering, Department of Architecture and Civil Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden – sequence: 2 givenname: Morgan surname: Johansson fullname: Johansson, Morgan organization: Division of Structural Engineering, Department of Architecture and Civil Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden – sequence: 3 givenname: Mohammad surname: Al-Emrani fullname: Al-Emrani, Mohammad organization: Division of Structural Engineering, Department of Architecture and Civil Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden – sequence: 4 givenname: Reza surname: Haghani fullname: Haghani, Reza email: reza.haghani@chalmers.se organization: Division of Structural Engineering, Department of Architecture and Civil Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
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Keywords	Flexural strengthening Nonlinear finite element analysis Carbon fibre reinforced polymer (CFRP) Prestress Intermediate crack-induced debonding Self-anchorage Reinforced concrete (RC)
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Snippet	•Self-anchored prestressed CFRP plates without the need for mechanical end anchorage.•Significant improvement in bending stiffness, crack width, and... This paper presents an innovative method of prestressing carbon fibre reinforced polymer (CFRP) plates used as externally bonded reinforcement for flexural...
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SubjectTerms	Anchorages Bearing strength Bonding strength Carbon fiber reinforced plastics Carbon fibre reinforced polymer (CFRP) Carrying capacity Debonding Fiber reinforced polymers Finite element method Flexural strengthening Intermediate crack-induced debonding Investigations Load carrying capacity Mechanical properties Model testing Nonlinear finite element analysis Plates Polymers Prestress Prestressing Reinforced concrete Reinforced concrete (RC) Self-anchorage Stiffness Strengthening
Title	Innovative flexural strengthening of RC beams using self-anchored prestressed CFRP plates: Experimental and numerical investigations
URI	https://dx.doi.org/10.1016/j.engstruct.2021.112687 https://www.proquest.com/docview/2564175652 https://research.chalmers.se/publication/524650
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