This project was concluded in March 2023.
Project information
Project name
Relationship between stiffness and moisture changes in CLT at low mechanical loading
Project manager
Michael Dorn
Other project members
Carl Larsson, Carmen Amaddeo, Osama Abdeljaber
Participating organizations
Linnaeus University, Saab, Södra skogsägarna
Financier
Smart Housing Småland, own financing
Timetable
1 Apr 2022–31 Mar 2023
Subject
Building technology (Department of Building Technology, Faculty of technology)
Report
Samband mellan styvhet och ändring av fukthalt i KL-trä vid lågmekanisk belastning: Slutrapport till förstudieprojekt
More about the project
In laboratory environment, CLT elements are studied under heavily varied moisture content. The elements are excited at low movements by means of an external shaker. The first eigenfrequencies are measured continuously and the relation between moisture content and eigenfrequencies are investigated.
Cross-laminated timber (CLT) is produced by gluing boards together crosswise in layers. The elements are used as a construction material, primarily for walls and floor elements. The wood material naturally adjusts to the surrounding climate, leading to changes in its moisture content.
In this study, a CLT panel was examined under varying moisture conditions in a climate chamber at Linnaeus University. Eigenfrequencies and moisture levels were monitored, and their correlation with the climate was investigated.
It was found that the first and third measured eigenfrequencies (bending modes) showed negative correlation with ambient moisture; they increased as the moisture decreased, and vice versa. However, the second eigenfrequency (related to torsion) revealed a more complex relationship. Several possible explanations are presented to account for this complexity.
Contributing organizations included Linnaeus University as the main contributor, with support from Södra Skogsägarna and Saab.
The project was part of the research in the Structural health monitoring research group and the Linnaeus Knowledge Environment: Green Sustainable Development.
Staff
