Moisture-induced stresses in large glulam beams. Case study: Vihantasalmi Bridge

Stefania Fortino, Petr Hradil, Giovanni Metelli

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The structural performance of timber elements may depend on the environmental conditions and in particular on the cyclic variations of the moisture content. Moisture gradients in the sections of the structural elements can produce additional stresses, the so-called moisture-induced stresses (MIS), which can cause the formation of cracks and delamination in wooden components. In order to achieve a reliable evaluation of the safety level of timber structures, the present paper proposes a numerical methodology to evaluate the MIS in glulam beams of timber bridges under Northern European climates and mechanical loads. A hygro-thermal multi-Fickian model for prediction of moisture content, relative humidity and temperature in wood is sequentially coupled with an orthotropic-viscoelastic-mechanosorptive model for calculation of wood stresses. Both models were developed by some of the authors in Abaqus FEM code in previous works and their coupling is used here to analyse the hygro-thermo-mechanical response of a glulam beam of Vihantasalmi Bridge in Finland under bending loads. Both perpendicular and parallel to grain MIS in a beam section sheltered from rain are evaluated during a 10-year analysis and conclusions on the crack risk related to these stresses are given.

    Original languageEnglish
    Pages (from-to)366-380
    Number of pages15
    JournalWood Material Science and Engineering
    Volume14
    Issue number5
    Early online date9 Jul 2019
    DOIs
    Publication statusPublished - 3 Sep 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Moisture
    Timber
    Wood
    Cracks
    Delamination
    Rain
    Loads (forces)
    Atmospheric humidity
    Finite element method
    Temperature

    Keywords

    • finite element method
    • hygro-mechanical analysis
    • moisture-induced stresses
    • multi-Fickian models
    • timber bridges
    • Wood

    Cite this

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    title = "Moisture-induced stresses in large glulam beams. Case study: Vihantasalmi Bridge",
    abstract = "The structural performance of timber elements may depend on the environmental conditions and in particular on the cyclic variations of the moisture content. Moisture gradients in the sections of the structural elements can produce additional stresses, the so-called moisture-induced stresses (MIS), which can cause the formation of cracks and delamination in wooden components. In order to achieve a reliable evaluation of the safety level of timber structures, the present paper proposes a numerical methodology to evaluate the MIS in glulam beams of timber bridges under Northern European climates and mechanical loads. A hygro-thermal multi-Fickian model for prediction of moisture content, relative humidity and temperature in wood is sequentially coupled with an orthotropic-viscoelastic-mechanosorptive model for calculation of wood stresses. Both models were developed by some of the authors in Abaqus FEM code in previous works and their coupling is used here to analyse the hygro-thermo-mechanical response of a glulam beam of Vihantasalmi Bridge in Finland under bending loads. Both perpendicular and parallel to grain MIS in a beam section sheltered from rain are evaluated during a 10-year analysis and conclusions on the crack risk related to these stresses are given.",
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    Moisture-induced stresses in large glulam beams. Case study : Vihantasalmi Bridge. / Fortino, Stefania; Hradil, Petr; Metelli, Giovanni.

    In: Wood Material Science and Engineering, Vol. 14, No. 5, 03.09.2019, p. 366-380.

    Research output: Contribution to journalArticleScientificpeer-review

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