Dynamic Optimization of High Rise Timber-Hybrid Buildings A FEM study of the effect on the dynamic response of com bining timber and concrete in a high rise building
Publicerad
Författare
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In recent years, the popularity of building high rise timber buildings has increased.
Some reasons for using timber in high rise structural systems are for environmental,
architectural and marketing aspects. Timber is a light-weight building material
which can result in large dynamic effects due to wind, causing comfort problems in
the buildings. One solution is to build timber-hybrid structures that utilize other
structural materials in combination with timber. A study is done with focus on
dynamic responses in high rise timber and timber-hybrid buildings to optimize the
combination of timber and concrete.
The aim of the project is to get a better understanding of the effect on added
stiffness and mass by utilizing concrete as material in high rise timber-hybrid
buildings and how it influences the dynamic response. The work is carried out by using
FE analyses to determine the dynamic properties of different timber-hybrid buildings.
The FEM study is performed using the software FEM-Design. Using results
from the FEM study, calculations methods from EKS 12 and Eurocode 1-4 are used
to determine the accelerations in buildings caused by wind loads. The results are
compared to the human comfort requirements of ISO 10137 and ISO 6897.
The results show that replacing timber structural elements with concrete is an effective
way of improving dynamic properties in high rise timber buildings. It is shown
that concrete floors are more efficient at the top of the building, where the mass has
the largest influence. It is also shown that concrete cores are effective throughout the
full height of the building. The most optimal solutions are found when a concrete
core and concrete floors were utilized in the structural systems. The CLT structural
system can be built with less concrete than the Glulam column system, however the
CLT building requires more timber. A building with both systems combined can
be used to increase the building height and reduce concrete volume compared to
just using one system. A tuned mass damper is shown to be a potential solution to
dynamic problems in high rise timber hybrid buildings.
Beskrivning
Ämne/nyckelord
Structural dynamics, Timber, Timber-hybrid, Tall timber building, Con crete volume, Wind, Damping, TMD, Modal mass, Mode shape, Acceleration, CLT, Glulam.