Fully reversible reinforcement of softwood beams with unbonded composite plates

Marco Corradi; Antonio Borri; Giulio Castori; Emanuela Speranzini

doi:10.1016/j.compstruct.2016.04.014

Fully reversible reinforcement of softwood beams with unbonded composite plates

Marco Corradi, Antonio Borri, Giulio Castori, Emanuela Speranzini

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

In this paper, results of flexure tests aimed at improving the structural behavior of softwood beams reinforced with unglued composite plates and at developing an effective alternative to the use of organic resins are presented. The addition of modest ratios of GFRP (Glass Fiber Reinforced Polymer) composite strengthening can prevent tension failure in timber beams. However the application of organic matrices presents problems of reversibility, compatibility and durability with timber and poor performance at high temperatures. The increment in capacity and stiffness and the analysis of the failure modes is the central focus of this paper. The experimental campaign is dealing with a significant number of un-reinforced and reinforced beams strengthened with unbonded GFRP plates. A 3-dimensional finite element model is also presented for simulating the non-linear behavior of GFRP-reinforced softwood beams. The ability of the numerical model to reproduce experimental results for the load-deflection curves is validated.

Original language	English
Pages (from-to)	54-68
Number of pages	15
Journal	Composite Structures
Volume	149
Early online date	17 Apr 2016
DOIs	https://doi.org/10.1016/j.compstruct.2016.04.014
Publication status	Published - 1 Aug 2016
Externally published	Yes

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10.1016/j.compstruct.2016.04.014Licence: CC BY

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title = "Fully reversible reinforcement of softwood beams with unbonded composite plates",

abstract = "In this paper, results of flexure tests aimed at improving the structural behavior of softwood beams reinforced with unglued composite plates and at developing an effective alternative to the use of organic resins are presented. The addition of modest ratios of GFRP (Glass Fiber Reinforced Polymer) composite strengthening can prevent tension failure in timber beams. However the application of organic matrices presents problems of reversibility, compatibility and durability with timber and poor performance at high temperatures. The increment in capacity and stiffness and the analysis of the failure modes is the central focus of this paper. The experimental campaign is dealing with a significant number of un-reinforced and reinforced beams strengthened with unbonded GFRP plates. A 3-dimensional finite element model is also presented for simulating the non-linear behavior of GFRP-reinforced softwood beams. The ability of the numerical model to reproduce experimental results for the load-deflection curves is validated.",

keywords = "Bending tests, Composite materials, FEM analysis, GFRP plates, Screwed connection, Softwood",

author = "Marco Corradi and Antonio Borri and Giulio Castori and Emanuela Speranzini",

note = "Funding Information: The authors acknowledge the support of the Lastru laboratory at the University of Perugia (Italy) for the use of the test equipment. This project was sponsored by the Italian Ministry of Education and Research [ReLUIS (2014) Linea di ricerca WP1 e WP2]. The investigation was carried out with the help of the undergraduate students G. Capruzzi, M. S. Bernardi and S. Rumori, and the graduate research assistant A. Molinari. The authors also express their gratitude to Fibrenet for providing the composite materials. Publisher Copyright: {\textcopyright} 2016 The Authors.",

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doi = "10.1016/j.compstruct.2016.04.014",

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AU - Corradi, Marco

AU - Borri, Antonio

AU - Castori, Giulio

AU - Speranzini, Emanuela

N1 - Funding Information: The authors acknowledge the support of the Lastru laboratory at the University of Perugia (Italy) for the use of the test equipment. This project was sponsored by the Italian Ministry of Education and Research [ReLUIS (2014) Linea di ricerca WP1 e WP2]. The investigation was carried out with the help of the undergraduate students G. Capruzzi, M. S. Bernardi and S. Rumori, and the graduate research assistant A. Molinari. The authors also express their gratitude to Fibrenet for providing the composite materials. Publisher Copyright: © 2016 The Authors.

PY - 2016/8/1

Y1 - 2016/8/1

N2 - In this paper, results of flexure tests aimed at improving the structural behavior of softwood beams reinforced with unglued composite plates and at developing an effective alternative to the use of organic resins are presented. The addition of modest ratios of GFRP (Glass Fiber Reinforced Polymer) composite strengthening can prevent tension failure in timber beams. However the application of organic matrices presents problems of reversibility, compatibility and durability with timber and poor performance at high temperatures. The increment in capacity and stiffness and the analysis of the failure modes is the central focus of this paper. The experimental campaign is dealing with a significant number of un-reinforced and reinforced beams strengthened with unbonded GFRP plates. A 3-dimensional finite element model is also presented for simulating the non-linear behavior of GFRP-reinforced softwood beams. The ability of the numerical model to reproduce experimental results for the load-deflection curves is validated.

AB - In this paper, results of flexure tests aimed at improving the structural behavior of softwood beams reinforced with unglued composite plates and at developing an effective alternative to the use of organic resins are presented. The addition of modest ratios of GFRP (Glass Fiber Reinforced Polymer) composite strengthening can prevent tension failure in timber beams. However the application of organic matrices presents problems of reversibility, compatibility and durability with timber and poor performance at high temperatures. The increment in capacity and stiffness and the analysis of the failure modes is the central focus of this paper. The experimental campaign is dealing with a significant number of un-reinforced and reinforced beams strengthened with unbonded GFRP plates. A 3-dimensional finite element model is also presented for simulating the non-linear behavior of GFRP-reinforced softwood beams. The ability of the numerical model to reproduce experimental results for the load-deflection curves is validated.

KW - Bending tests

KW - Composite materials

KW - FEM analysis

KW - GFRP plates

KW - Screwed connection

KW - Softwood

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JO - Composite Structures

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Fully reversible reinforcement of softwood beams with unbonded composite plates

Abstract

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