Prestressed FRP Sheets as External Reinforcement of Wood Members

Triantafillou, Thanasis; Deskovic, Nikola

doi:10.1061/(asce)0733-9445(1992)118:5(1270)

Cited by 132 publications

(62 citation statements)

References 8 publications

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“…In order to determine the ultimate bending moment, some authors have developed for FRP reinforcements (Triantafillou and Deskovic, [26]), (Lindenberg,[27]), (Fiorelli and Alves Dias, [15]) theoretical models based on the of hypothesis of Navier/Bernoulli (plane sections remain plane after being strained) and considers the limit states of the timber's tension and compression failure. The timber's tensile limit state is considered to have been attained when the maximum tensile stress is equal to its tensile strength.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

Strengthening of timber beams with high strength steel cords

Borri

Corradi

2011

Composites Part B: Engineering

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ABSTRACT:This paper presents an experimental study on the strengthening of wood beams under bending loads through the use of very high strength steel cords. The study also presents the results of 21 double shear push-out tests conducted to determine the strength of Steel fiber Reinforced Polymers (SRP) bonded to wood prisms. An experimental programme based on a four-point bending test configuration is proposed to characterize the stiffness, ductility and strength response of strengthened wood beams. Mechanical tests on the strengthened wood showed that external bonding of steel fibers produce high increases in flexural stiffness and capacity. Finally experiment results are used to calibrate existing analytical formulations for capacity prediction. This economic and effective technique may be an interesting alternative to glass or carbon fibres or other expensive retrofitting methods.

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Section: Analysis Of the Resultsmentioning

confidence: 99%

Strengthening of timber beams with high strength steel cords

Borri

Corradi

2011

Composites Part B: Engineering

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“…Because carbon fibre reinforced polymers (CFRPs) have higher mechanical properties, they are used in the applications that need higher strength (Meier 1995;Nowak et al 2013). The flexural behaviors of wood beams reinforced with prestressed carbon/epoxy fiber-reinforced plastic (FRP) sheets have superior performance in terms of favorable strength, stiffness, and ductility (Triantafillou and Deskovic 1992).…”

Section: Introductionmentioning

confidence: 99%

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

et al. 2017

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Laminated composite wooden construction elements were produced with 7 layers of Scots pine (Pinus sylvestris L.). Fiberglass wire mesh and aluminum wire mesh, which were used as reinforcement materials, were pressed with polyvinyl acetate (PVAc) and polyurethane-type adhesives between each Scots pine layer. The highest bonding strength values were obtained from laminated control specimens produced with polyurethane adhesive without using support materials (4.98 N/mm 2 ) and laminated control specimens made with polyurethane adhesive without using support materials (4.39 N/mm 2 ), respectively. The modulus of elasticity in bending perpendicular to the glue line values of all the specimens except the laminated control specimens produced with polyurethane adhesive without using support materials (14800 N/mm 2 ) were lower than solid wood (6720 N/mm 2 ). In contrast, in the experiments for the modulus of elasticity parallel to the glue line, the variables (adhesive, intermediary layer materials) used for all experiments and specimens were effective factors. Although the modulus of elasticity in bending parallel to the glue line values of all samples were higher than solid wood (6720 N/mm 2 ), the maximum value was obtained in the laminated control specimens produced with polyurethane adhesive without using support materials (17800 N/mm 2 ).

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“…Podemos encontrar sistemas variados de reparación basados en ellas, ya sean de unión de madera con madera en los apoyos (6), a lo largo de la pieza aumentando la sección (7), o con refuerzos de metal o con varillas de fibra de vidrio (8). En los últimos años se han añadi-do nuevos productos, como la fibra de carbono (9), y nuevas técnicas de pretensado con los plásticos reforzados con fibras (10). Sin embargo, no existen referencias al uso de la pre-deformación para el refuerzo de madera en rehabilitación, salvo cuando las soluciones pertenecen al ámbito de la ingeniería, y combinan hormigón con acero (11).…”

Section: Introductionunclassified

Métodos de trabajo y resultados de refuerzos en madera de un forjado del siglo XVII de la Sacristía de San Miguel en Morón de la Frontera (Sevilla)

2017

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Cómo citar este artículo/Citation: Ariza López, I., Guerrero Vega, J. M., Pinto Puerto, F. (2016). Métodos de trabajo y resultados de refuerzos en madera de un forjado del siglo xvii de la Sacristía de San Miguel en Morón de la Frontera (Sevilla). Informes de la Construcción, 69(545) RESUMENDurante el pasado siglo se pusieron en práctica numerosas soluciones de refuerzo de antiguos forjados de madera mediante losas que pretendían suplir las carencias de funcionamiento por causas reológicas o por deterioro de algunas de sus piezas. Algunas de estas soluciones, sin embargo, supusieron una sobrecarga innecesaria que agravó las patologías previas con el paso del tiempo, hasta el punto de requerir su apuntalamiento. Éste es el caso de uno de los forjados de la sacristía de la parroquia de San Miguel de Morón, un edificio levantado en el transcurso del siglo XVII anexo al templo. Los pisos de sus dos plantas estaban solucionados mediante forjados de vigas de madera y bovedillas de yeso. Como parte de los trabajos de restauración realizados en 2013, se desmontó un refuerzo previo realizado en 1970 mediante losa de hormigón, para ejecutar posteriormente un novedoso tipo de refuerzo con madera laminada, pretensando la unión entre las piezas nuevas y viejas, lo que ha permitido reducir de forma notable las flechas, mantener todos sus elementos principales y obtener un comportamiento más eficiente. La presente aportación expone las condiciones previas a la intervención, el proceso seguido y los resultados obtenidos durante esta restauración valorando los cálculos y previsiones realizadas.Palabras clave: rehabilitación; patrimonio; refuerzo estructural; forjado de madera; encolado; pre-flexión. ABStrACt

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Prestressed FRP Sheets as External Reinforcement of Wood Members

Cited by 132 publications

References 8 publications

Strengthening of timber beams with high strength steel cords

Strengthening of timber beams with high strength steel cords

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

Métodos de trabajo y resultados de refuerzos en madera de un forjado del siglo XVII de la Sacristía de San Miguel en Morón de la Frontera (Sevilla)

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