Strength of a Tower for a High-Rise Hybrid Timber Building: A study of how different parameters affect the dynamic performance of a building
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Structural engineering and building technology (MPSEB), MSc
Publicerad
2024
Författare
Kallmér, Isak
Alkhateb, Mahmoud
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
One of the most common construction materials for tall buildings is concrete. Alternatives
to concrete buildings are timber and hybrid buildings. Two main advantages
of building in timber are that it is environmentally friendly and the strength-toweight
ratio is large. The main challenge is also tied to timber’s lightweight nature,
which significantly contributes to wind-induced accelerations. These accelerations
have adverse effects on the occupants, leading to a threshold beyond which they
become unacceptable. Another challenge arises from timber’s inherent weakness
compared to concrete, which implies that there may be a limit to the height a building
can reach while maintaining reasonable dimensions.
The thesis investigates how different parameters affect the dynamic response of a tall
building but also in relation to load-bearing capacity. The project was performed for
a fictitious building with different structural systems. Both FE analyses and hand
calculations were performed to verify the serviceability limit state criteria with a
major focus on accelerations together with verifying the load-bearing capacity of
the structural timber elements in a building.
The investigations showed that the dynamic performance of the building increased
when the amount of concrete increased. The increase also resulted in an increased
utilization ratio in the ultimate limit state. Based on the results, it was concluded
that in most cases, it was the acceleration criterion that was the most critical in the
design of a timber hybrid building. The main parameters determining the dynamic
performance are the stiffness of the building and the equivalent mass. An increase
in mass and possibly also the stiffness of the building will decrease the acceleration
of the building. For example, thicker wall elements will contribute to larger mass
and stiffness. The structural system with walls and slabs performed dynamically
better than a beam and column system with less mass and stiffness, which becomes
more prone to wind-induced vibrations.
Beskrivning
Ämne/nyckelord
Hybrid building, Tall Hybrid Timber Building, CLT, Glulam, Structural Dynamcis, Wind Dynamcis, Finite Element Analysis, Acceleration, ULS, SLS