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The effects of joints on the moisture behaviour of rain exposed wood: a numerical study with experimental validation
Wood Material Science & Engineering ( IF 2.2 ) Pub Date : 2019-04-02 , DOI: 10.1080/17480272.2019.1600163
J. Niklewski 1 , M. Fredriksson 2
Affiliation  

ABSTRACT

Joints in timber structures are particularly vulnerable to degradation due to their tendency to trap moisture. The mechanisms involved, and their effect on the moisture conditions of wood, are here investigated numerically. The horizontal member of a rail and post-type configuration is modelled numerically by a two-dimensional diffusion model with material properties for Norway spruce. Contact areas are assumed to be fully wetted when the specimen is exposed to free water but are unable to interact with the ambient air. Water that is absorbed through such areas cannot dry out through the same surface and is instead redistributed. The model was validated against experimental data, both previously unpublished data and data obtained from the literature, including both laboratory and outdoor exposure. The numerical solutions were, in general, consistent with the measured data. The model provides a simple, yet accurate, method to estimate the moisture conditions in certain types of wood joints. In addition, the spatial distribution of time spent above 25% moisture content was calculated, in order to investigate the suitability of the model for durability applications.



中文翻译:

接缝对雨淋木材的水分行为的影响:具有实验验证的数值研究

摘要

木材结构中的接缝由于易于捕获水分而特别容易退化。本文对涉及的机理及其对木材水分条件的影响进行了数值研究。铁路和后置式配置的水平构件通过二维扩散模型进行数值建模,该模型具有挪威云杉的材料特性。当样品暴露于自由水但无法与周围空气相互作用时,假定接触区域已完全润湿。通过这些区域吸收的水不能在同一表面变干,而是重新分配。该模型已针对实验数据进行了验证,包括先前未发表的数据和从文献中获得的数据,包括实验室和室外暴露。数值解通常是 与实测数据一致。该模型提供了一种简单而准确的方法来估算某些类型的木缝中的水分状况。此外,计算了水分含量高于25%时所花费时间的空间分布,以研究该模型对耐久性应用的适用性。

更新日期:2019-04-02
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