Probabilistic expression of the function of the change in prestressing force of timber elements depending on climatic conditions in situ

Influence of the External Environment on the Moisture Spectrum of Norway Spruce (Picea abies (L.) KARST.)

“…The experiment utilized a compact profile of Norway spruce (Picea abies (L.) KARST.) wood with cross-sectional dimensions of 138 mm × 138 mm and a length of 273 mm, as described in [10,27]. To determine the essential characteristics and ensure the quality of the timber, we measured its average density (oven-dry density) according to the ČSN 49 0108 standard.…”

“…Due to their different structures, individual wood species may differ in their relationship to the joint actions of moisture and temperature. These structural differences also significantly influence the resulting mechanical properties of the wood [25][26][27].…”

“…The paper also highlighted the increasing use of timber in bridge constructions and timber-concrete composites, with specific parameters significantly influencing their long-term behavior. The second paper offered a comprehensive study on the use of transverse prestressing in timber structures, illustrating how environmental conditions can significantly influence the prestressing force and, consequently, the load-bearing capacity and stiffness of these structures [27]. The researchers proposed a mathematical model to predict changes in prestressing force over time based on climatic conditions, underscoring the importance of renewable materials in construction for sustainability.…”

“…Specifically, we used principal component analysis and repeated cross-validation methods. By applying these advanced statistical techniques, we aimed to describe the dependency between the surrounding temperature and the wood moisture of the specimen, thereby contributing to the ongoing discourse on the sustainable use of timber in construction [21,27].…”