ABSTRACT

The durability of wood depends on its in-use environmental conditions. The aim of this study was to estimate the effects associated with macro climate and detail design as well as their interdependence. A numerical moisture model and two different decay prediction models were utilized for assessing the decay risk of a horizontal member and a joint exposed at 300 sites scattered across Europe. In general, the results obtained with both decay models exhibited strong similarities to the Scheffer climate index. Distinct discrepancies were however observed in regions with much precipitation where one model stood out as less dependent on precipitation and more dependent on relative humidity. The projected decay rate of the joint was about two to four times higher than that of the horizontal board, depending on the model employed. One of the models indicated that the relative difference between the horizontal member and the joint decreased with increasing amounts of precipitation. Due to lack of reliable experimental data, no inference regarding the model accuracy could be made. Future studies should focus on collecting empirical data on relative decay risk in different climates, preferably focusing on regions where the difference in projected decay depends on the model employed.

摘要

木材的耐久性取决于其使用环境条件。这项研究的目的是估计与宏观气候和详细设计及其相互依存性相关的影响。利用数值水分模型和两个不同的衰减预测模型来评估水平构件和在欧洲分布的300个地点暴露的接缝的衰减风险。通常，两个衰减模型获得的结果都与Scheffer气候指数非常相似。然而，在降水量大的地区观察到了明显的差异，其中一种模式表现出对降水的依赖性较小，而对相对湿度的依赖性较大。根据所使用的模型，关节的预计衰减率大约是水平板的2-4倍。其中一种模型表明水平构件和节理之间的相对差异随着降水量的增加而减小。由于缺乏可靠的实验数据，因此无法推断出模型的准确性。未来的研究应集中于收集有关不同气候下相对衰减风险的经验数据，最好集中于预计衰减差异取决于所采用模型的地区。