Modelling the hygro-mechanical creep behaviour of FRP reinforced timber elements

O’Ceallaigh, C.; Sikora, Karol; McPolin, Daniel; Harte, Annette M.

doi:10.1016/j.conbuildmat.2020.119899

Cited by 26 publications

(15 citation statements)

References 39 publications

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“…with σ n as the stress state at the beginning of the increment (following O'Ceallaigh et al [16]), |∆ Ū | as the incremental increase of the maximum reached MC level in the current time increment and the irrecoverable meachnosorptive compliance tensor…”

Section: Irrecoverable Mechanosorptionmentioning

confidence: 99%

Evaluation of moisture-induced stresses in wood cross-sections determined with a time-dependent, plastic material model during long-time exposure

Pech,

Autengruber,

Lukacevic

et al. 2023

Preprint

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In recent years, the use of timber as a building material in larger construction applications such as multi-story buildings and bridges has increased. This requires a better understanding of the material to realize such constructions and design them more economically. However, accurate computational simulations of timber structures are challenging due to the complexity and inhomogeneity of this naturally grown material. It exhibits growth inhomogeneities such as knots and fiber deviations, orthotropic material behavior and moisture dependence of almost all physical parameters. Describing the creep response of wood under real climate conditions is particularly difficult. Changes in moisture content, plasticity and viscoelasticity affect moisture-induced stresses and potentially lead to cracks and structural damage. In this paper, we apply a material model that combines time and moisture-dependent behavior with multisurface plasticity to simulate cross-sections of different dimensions over a 14-month climate period. Our findings indicate that considering this long-term behavior has a minor impact on moisture-induced stresses during the drying period. However, during the wetting period, a purely linear elastic description of the material behavior of wood significantly overestimates tensile stresses within the cross-section, resulting in unrealistic predictions of wetting-induced fracture. Therefore, simulations during wetting periods require a sophisticated rheological model to properly reproduce the stress field.

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Section: Irrecoverable Mechanosorptionmentioning

confidence: 99%

Evaluation of moisture-induced stresses in wood cross-sections determined with a time-dependent, plastic material model during long-time exposure

Pech,

Autengruber,

Lukacevic

et al. 2023

Preprint

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show abstract

“…The FRP reinforcement can reduce the creep deformation of timber beams. Creep in wood can be divided into two broad categories, i.e., elastic creep and mechanical adsorption creep [92]. The creep of bamboo and wood members is affected by temperature [93].…”

Section: Creep Resistancementioning

confidence: 99%

A Review on Strengthening of Timber Beams Using Fiber Reinforced Polymers

Jian¹,

Cheng²,

Li³

et al. 2022

Journal of Renewable Materials

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Fiber reinforced polymer (FRP) has been used in the construction industry because of its advantages such as high strength, light weight, corrosion resistance, low density and high elasticity. This paper presents a review of bonding techniques adopted to strengthen timber beams using FRP to achieve larger spans. Different methods of bonding between FRP and timber beams have been summarized with a focus on the influencing factors and their effects as well as relevant bond-slip models proposed for fundamental understanding. Experimental investigations to evaluate the flexural performance of timber beams strengthened by FRP bars, sheets and wraps have also been critically reviewed to identify key influencing parameters. Limited research available on the shear performance of FRP reinforced timber beams have been analyzed to determine the influencing factors of the shear performance in timber-FRP beams. The paper finally presents an overall summary of the current-state-of-the-art and proposes some future research directions in the field.

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“…A friction factor of 0.4 (O'Ceallaigh et al, 2020) was considered as the contact between the wood, screws, and steel plate. In the models with FC, a perfect adhesion between the reinforcement and the wood was considered, aiming at the ideal behavior of the epoxy fi xing adhesive.…”

Section: Confi Guration Of the Modelsmentioning

confidence: 99%

Numerical Analysis of Hardwood Timber Beams Reinforced With Steel Plate Screwed

Jardim¹,

Mascarenhas²,

Almeida³

et al. 2022

Rev. Árvore

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There are several technologies to recover and strengthen timber structures. Two usual alternatives are: the use of steel plates screwed and carbon fi ber mats glued with epoxy adhesive. A gap was observed in the literature regarding the study of reinforcement in hardwood timber beams with cross-section loss, commonly found in attacks by biotic or abiotic agents. This study aimed to analyze the fl exural stiff ness recovery capacity of steel plate screwed to a timber beam with diff erent cross-sectional losses, with a special interest in the eff ect caused by diff erent bolt arrangements. The results were compared with simulations made using a carbon fi ber mat (CF). It was possible to observe that, despite presenting lower effi ciency than the CD, the use of steel plate screwed could return the initial stiff ness in some models, and the specifi cation of the bolts is relevant in obtaining the results.

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Modelling the hygro-mechanical creep behaviour of FRP reinforced timber elements

Cited by 26 publications

References 39 publications

Evaluation of moisture-induced stresses in wood cross-sections determined with a time-dependent, plastic material model during long-time exposure

Evaluation of moisture-induced stresses in wood cross-sections determined with a time-dependent, plastic material model during long-time exposure

A Review on Strengthening of Timber Beams Using Fiber Reinforced Polymers

Numerical Analysis of Hardwood Timber Beams Reinforced With Steel Plate Screwed

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