Static and dynamic properties of retrofitted timber beams using glass fiber reinforced polymers

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Title: Static and dynamic properties of retrofitted timber beams using glass fiber reinforced polymers
Authors: Bru, David | Baeza, F. Javier | Varona Moya, Francisco de Borja | Garcia-Barba, Javier | Ivorra, Salvador
Research Group/s: Grupo de Ensayo, Simulación y Modelización de Estructuras (GRESMES) | Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura | Ingeniería del Terreno y sus Estructuras (InTerEs)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Timber structures | GFRP | Dynamic characterization | Ductility
Knowledge Area: Mecánica de Medios Continuos y Teoría de Estructuras | Ingeniería de la Construcción | Ingeniería del Terreno
Issue Date: Jan-2016
Publisher: Springer Netherlands
Citation: Materials and Structures. 2016, 49(1): 181-191. doi:10.1617/s11527-014-0487-0
Abstract: A study on the static and dynamic properties of sawn timber beams reinforced with glass fiber-reinforced polymer (GFRP) is reported in this paper. The experimental program is focused on the behavior of unidirectional wooden slabs, and the main objective is to fulfill the service state limit upon vibrations using GFRP when an architectonical retrofitting project is necessary. Two different typologies of reinforcement were evaluated on pine wood beams: one applied the composite only on the lower side of the beams, while the other also covered half of the beams depth. For the dynamic characterization, the natural frequency, damping ratio, and dynamic elastic modulus were measured using two different techniques: experimental modal analysis upon the whole beams; and bandwidth method using smaller samples of the same material. The static characterization consisted of four point bending tests, where elastic modulus, bending strength and ductility were assessed. The lower composite had better ductility and bending strength. On the other hand, the U-shaped laminate showed higher stiffness but also at a higher material cost. However, it allowed some ductility, i.e. compressive plasticity, even in the presence of hidden knots. Both dynamic techniques gave similar results and were capable of measuring the structure stiffness, even if short samples were used. Finally, the changes on dynamic properties because of the GFRP did not jeopardize the dynamic performance of the reinforced timber beams.
Sponsor: The authors want to acknowledge the University of Alicante for their economic support, Grant GRE12-04, Generalitat Valenciana Grant GV/2014/079 and the Spanish “Ministerio de Economía y Competitividad”, Grant BIA2012-34316.
URI: http://hdl.handle.net/10045/63147
ISSN: 1359-5997 (Print) | 1871-6873 (Online)
DOI: 10.1617/s11527-014-0487-0
Language: eng
Type: info:eu-repo/semantics/article
Rights: © RILEM 2014. The final publication is available at Springer via http://dx.doi.org/10.1617/s11527-014-0487-0
Peer Review: si
Publisher version: http://dx.doi.org/10.1617/s11527-014-0487-0
Appears in Collections:INV - GRESMES - Artículos de Revistas
INV - DMCIA - Artículos de Revistas
INV - INTERES - Artículos de Revistas

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