A 3D moisture-stress FEM analysis for time dependent problems in timber structures

Fortino, Stefania; Mirianon, Florian; Toratti, Tomi

doi:10.1007/s11043-009-9103-z

Cited by 87 publications

(98 citation statements)

References 18 publications

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“…While basic information about viscoelasticity is given in Nowacki (1965) and Lockett (1972) for example, bending creep tests can be found in Zhou et al (1999) and Bengtsson and Kliger (2003) or under tensile and compressive load in Toratti and Svensson (2000). Theoretical investigations concerning constitutive laws and models were studied in Kaliske (2000), Svensson and Toratti (2002), Hanhijärvi and Mackenzie-Helnwein (2003) or Fortino et al (2009).…”

Section: Introductionmentioning

confidence: 99%

Moisture-dependent, viscoelastic creep of European beech wood in longitudinal direction

Hering

Niemz

2012

Eur. J. Wood Prod.

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In the present study, the pure viscoelastic behaviour of European beech wood is analysed in the longitudinal direction at three different moisture contents. The moisture-dependent creep compliance is identified using a four-point bending test device. The viscoelastic behaviour is ascertained to be linear with moisture content and quantified by means of a Kelvin-Voigt model approach. Viskoelastisches Kriechverhalten von Rotbuche in longitudinaler Richtung bei verschiedenen HolzfeuchtenZusammenfassung In dieser Arbeit wird das viskoelastische Verhalten von Rotbuchenholz in longitudinaler Richtung bei drei verschiedenen Holzfeuchten untersucht. Mit Hilfe eines Vierpunktbiegeprüfstandes wurde die feuchteabhängige Kriechnachgiebigkeit bestimmt. Ein linearer Zusammenhang zwischen der Holzfeuchte und der Kriechnachgiebigkeit wird nachgewiesen und anhand eines verallgemeinerten Kelvin-Voigt Ansatzes quantifiziert.

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Section: Introductionmentioning

confidence: 99%

Moisture-dependent, viscoelastic creep of European beech wood in longitudinal direction

Hering

Niemz

2012

Eur. J. Wood Prod.

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“…The moisture content of timber has a significant influence on the long-term behaviour of STC members. Accordingly, the initial moisture content of each fibre within the timber component should be determined first, and the moisture content of timber over time is calculated with respect to the relative humidity and temperature of the environment by solving the Fick's second law [23] given by…”

Section: Frame Fe Formulationmentioning

confidence: 99%

08.27: Steel‐timber composite (STC) beams: Numerical simulation of long‐term behaviour

et al. 2017

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Conventional steel-concrete composite floors comprising of steel sections and sheeting, cast in situ concrete and embedded stud shear connectors are made from energy-and carbonintensive construction materials, viz. concrete and steel. Replacing conventional reinforced concrete floors with solid timber, in particular cross-laminated timber (CLT) with improved stability and structural characteristics, can significantly increase the speed of construction, reduce the need for rigging and craneage and also lower the self-weight of the building, the size of the columns and foundations and therefore the overall carbon footprint of the building. However, experimental data on the short-and long-term structural performance of steel-timber composite (STC) floors under service loading conditions are scarce and no long-term theoretical analyses of steel-timber composite floors have been reported hitherto in the literature. Accordingly, non-linear 1-D frame finite element models are developed in this paper, and validated against experimental data on timber and hybrid timber composite beams. The numerical tool is then employed to predict the long-term stiffness and load-deflection response of STC floors under service loading conditions. A parametric study is carried out and the influence of the stiffness of the shear connectors, timber shrinkage, creep, hydro-expansion and mechano-sorptive effect on the long-term behaviour of the STC beams are investigated.

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“…The diffusion coefficient has been shown to depend on both moisture content and temperature [19]. The moisture exchange with the ambient air which occurs on the surface can be described as follows [14]:…”

Section: Numerical Modelmentioning

confidence: 99%

“…Models based on Fick's second law of diffusion are frequently used in applications such as prediction of creep [10][11][12] and calculation of moisture induced stresses [13,14]. However, the parameters of these models are usually limited to moisture contents below the fiber saturation point where wood is not susceptible to decay [4].…”

Section: Introductionmentioning

confidence: 99%

Moisture content prediction of rain-exposed wood: Test and evaluation of a simple numerical model for durability applications

Niklewski

Fredriksson

Isaksson

2016

Building and Environment

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Decay prediction models are frequently used to estimate the service life of wooden components. These models require knowledge of how the material climate, i.e. moisture content and material temperature, varies over time. Therefore, a reliable material climate prediction model is crucial in situations when measurements are not viable. The aim of this paper is to test and evaluate the performance of a simple numerical moisture transport model for rain-exposed wood. The main focus is on the influence of rain and moisture transport in the transversal direction. First, a model based on Fick's second law of diffusion was calibrated against laboratory measurements where wooden boards were exposed to artificial rain. Second, the model was tested against field-test measurements on wooden boards in use-class 3.1, i.e. above-ground, exposed to rain and free to dry. The influence of rain was investigated by studying the difference between sheltered and exposed specimens over time. Finally, the model was applied to a number of Swedish climates and two different decay-prediction models were used to assess the output.The main conclusion is that the influence of rain can be reproduced with sufficient accuracy for the particular application. The error between the numerical result and measurements tends to increase with decreasing temperature and at high moisture contents. However, the total error is reduced when the moisture content history is post-processed in a decay-prediction model as the rate of decay tends to decrease with decreasing temperature.

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A 3D moisture-stress FEM analysis for time dependent problems in timber structures

Cited by 87 publications

References 18 publications

Moisture-dependent, viscoelastic creep of European beech wood in longitudinal direction

Moisture-dependent, viscoelastic creep of European beech wood in longitudinal direction

08.27: Steel‐timber composite (STC) beams: Numerical simulation of long‐term behaviour

Moisture content prediction of rain-exposed wood: Test and evaluation of a simple numerical model for durability applications

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