Numerical hygro-thermal analysis of coated wooden bridge members exposed to Northern European climates

Stefania Fortino, Petr Hradil, Andrea Genoese, Alessandra Genoese, Anna Pousette

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    This work presents a numerical model to analyse the hygro-thermal behaviour of wooden bridge members. A multi-Fickian hygro-thermal model, previously implemented by some of the authors, is extended by including the dependency of wood sorption on temperature above and below zero degrees Celsius to predict moisture, temperature and relative humidity in wood under Northern European climates. The performance of the model in the presence of protective paints is particularly investigated. The finite element analysis based on the proposed model simulates the hygro-thermal behaviour of a glue-laminated beam of Älsvbacka Bridge located in Skellefteå (North of Sweden). The beam, coated by paints and claddings, was monitored by using wireless sensors in a previous research. Comparisons with the available measurements reveal that the numerical model is able to predict the moisture content in locations sheltered from rain and sun with moisture levels below the fibre saturation point. A study of the influence of different protective paints shows that the maximum and minimum moisture content at various depths along horizontal paths of the beam cross section, as well as the moisture gradients in different seasonal periods, are strongly affected by the type of paint. The proposed numerical approach is a promising tool to facilitate sensor-based monitoring techniques and to optimize the choice of protective paints for improved performance of timber bridges and other wooden structures under variable climates.

    Original languageEnglish
    Pages (from-to)492-505
    Number of pages14
    JournalConstruction and Building Materials
    Volume208
    DOIs
    Publication statusPublished - 11 Mar 2019
    MoE publication typeNot Eligible

    Fingerprint

    Wooden bridges
    Paint
    Thermoanalysis
    Moisture
    Numerical models
    Wood
    Glues
    Sensors
    Timber
    Sun
    Rain
    Sorption
    Atmospheric humidity
    Finite element method
    Temperature
    Fibers
    Monitoring
    Hot Temperature

    Keywords

    • Coatings
    • European climates
    • FEM
    • Moisture content
    • Multi-Fickian models
    • Timber bridges

    Cite this

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    abstract = "This work presents a numerical model to analyse the hygro-thermal behaviour of wooden bridge members. A multi-Fickian hygro-thermal model, previously implemented by some of the authors, is extended by including the dependency of wood sorption on temperature above and below zero degrees Celsius to predict moisture, temperature and relative humidity in wood under Northern European climates. The performance of the model in the presence of protective paints is particularly investigated. The finite element analysis based on the proposed model simulates the hygro-thermal behaviour of a glue-laminated beam of {\"A}lsvbacka Bridge located in Skellefte{\aa} (North of Sweden). The beam, coated by paints and claddings, was monitored by using wireless sensors in a previous research. Comparisons with the available measurements reveal that the numerical model is able to predict the moisture content in locations sheltered from rain and sun with moisture levels below the fibre saturation point. A study of the influence of different protective paints shows that the maximum and minimum moisture content at various depths along horizontal paths of the beam cross section, as well as the moisture gradients in different seasonal periods, are strongly affected by the type of paint. The proposed numerical approach is a promising tool to facilitate sensor-based monitoring techniques and to optimize the choice of protective paints for improved performance of timber bridges and other wooden structures under variable climates.",
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    Numerical hygro-thermal analysis of coated wooden bridge members exposed to Northern European climates. / Fortino, Stefania; Hradil, Petr; Genoese, Andrea; Genoese, Alessandra; Pousette, Anna.

    In: Construction and Building Materials, Vol. 208, 11.03.2019, p. 492-505.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Hradil, Petr

    AU - Genoese, Andrea

    AU - Genoese, Alessandra

    AU - Pousette, Anna

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