Bidakov A. Methodology of calculating cross-laminated timber panels and their joints

Content of the Thesis. The introduction provides a general characteristic of the research and substantiates its relevance, novelty, applied value and pinpoints the important issues that need focused attention. Оverviews references on the development and improvement of the methods of calcualting and constructing cross-laminated timber (CLT) panels and laminated veneer lumber (LVL) as new timber-based materials for multi-storey wooden buildings of various functions. Сonsiders the technological issues of manufacturing combined strength classes CLT panels and focuses on the correlation between the thickness and the width of the boards in the panel’s cross-section and the required pressing parameters and adhesive system selection. Discusses the basic dependences of the timber stress state and the calculation model that takes into account the anisotropy of mechanical and elastic properties of timber as a linear-elastic material. Also proposes a method to account for the structural anisotropy of CLT panels as a composite material based on mutually perpendicular layers of boards of coniferous timber. Describes the methods for calculating the combined strength classes CLT panels under bending, stretching and compression parallel and perpendicular to the grain, as well under shear. The research involved experimental testing of the pull-off strength of both individual and grouped glued-in rods in different parts of the CLT-panel cross-section, which is required for using the proposed all-purpose glued-in steel rods joints. Development of a technique for experimental research into CLT-panels’ tensile strength perpendicular to the grain, which is relevant due to the current lack of theoretical and experimental research, as well as the relevant norms. Provides examples of calculating structural elements for CLT-panel buildings and application of the designed recommendations for calculating the strength of CLT wall and floor panels with variously sized perforations and apertures.