Analyse av arealutnyttelse, vibrasjoner og knutepunkter i moderne trekonstruksjoner

Cross-laminated timber (CLT) is a popular construction material combining good structural properties and environmental advantages. In the last decade, CLT has been playing a key role in increasing the use of timber construction due to upward production in CLT, especially in Europe. Consequently, codes and reliable standards are struggling to keep up with the rapid advancements of timber technologies. And therefore, CLT is a part of the currently ongoing revision of Eurocode 5. This master’s thesis investigates the behaviour of the CLT vibration and analysis the connection capacity of angular brackets with the use of analytical and numerical methods. For the vibration part, a study using the Eurocode 5, revised Eurocode 5 and non-linear FE-analysis using FEM-Design is used. For the analysis of the angular bracket, a material and geometric non-linear FE-analysis using ANSYS Workbench is used. Due to the lightweight properties and relatively high bending stiffness, CLT has a disadvantage when it comes to vibration induced by human walking. The study indicates that the new method to determine and evaluate vibration according to revised Eurocode 5 give a more promising results compared to FE-analysis. This study also proves that boundary condition of the floor support, especially when the floor edges is free from support, has the largest effect on the floor frequency and RMSacceleration and needs to take further account for in the ongoing revised Eurocode 5 to improve the design. When it comes to sound insulation, a recent study indicated that the use of screw or nail fasteners impairs the effect of soundproofing profile between CLT-floor and CLT-wall and recommends the use of angular brackets. Therefore, in this master thesis the structural capacity of this reinforced angular bracket is investigated further under the uplifting and shear forces which are transferred from the wall to the connection. As a result, the study shows that the way fasteners are arranged across the holes has the largest effect upon the capacity of the connection. An innovative solution of the arrangement shows that it is possible to increase the capacity of the bracket without increasing the amount of the fasteners