🏗️ Dynamic Behaviour of Timber Buildings: A Case Study on Fyrtornet 🌲
Importance of Dynamic Behaviour Analysis in Timber Structures
Timber buildings, especially tall ones, exhibit unique vibration characteristics compared to steel and concrete structures due to their lighter weight and flexible material nature. Accurately modelling their dynamic behaviour helps predict how they respond to wind, occupancy, and seismic loads. Such insights are vital to improve serviceability, structural integrity, and occupant comfort while promoting timber as a viable sustainable alternative for high-rise construction.
Role of Connection Behaviour in Vibration Modelling
Connections between timber elements, such as glued-laminated timber (GLT) trusses and cross-laminated timber (CLT) slabs, significantly influence overall stiffness and vibration response. The Fyrtornet study revealed that GLT connection stiffness evolves during the construction process, eventually reaching near-rigid behaviour after the addition of non-structural elements like screed and partitions. This highlights the necessity of incorporating realistic connection models in structural simulations to avoid underestimating stiffness and overestimating vibration amplitudes.
Influence of Non-Structural Elements on Structural Stiffness
Non-structural components—such as screed, partition walls, and glass façades—can alter the dynamic performance of timber buildings. In Fyrtornet, the inclusion of these elements enhanced overall stiffness and stability, contributing to reduced vibration levels. However, the study found that the glass façade’s contribution was minimal compared to internal walls and floor finishes, emphasizing that not all non-structural additions equally impact dynamic properties.
Significance of Foundation Conditions in Timber Building Dynamics
The foundation system plays a crucial role in determining the boundary conditions for vibration analysis. In the Fyrtornet case, the foundation displayed rigid boundary characteristics, meaning that it effectively restrained base motion and contributed to higher overall system stiffness. Recognizing foundation rigidity is essential for accurate finite element modelling, as it affects mode shapes, natural frequencies, and structural damping characteristics.
Advancements and Future Directions in Timber Structural Research
This study underscores the growing sophistication of dynamic testing and computational modelling in timber engineering. Future research should explore hybrid structural systems, long-term monitoring of stiffness evolution, and the effects of environmental conditions like moisture and temperature. Expanding data from real-life buildings such as Fyrtornet will help refine design codes and enhance the predictive accuracy of vibration serviceability models, supporting the global shift toward sustainable high-rise timber construction.
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