Long-term deformation behaviour of a Timber-Concrete Hybrid Structure A parametric and analytical study of vertical deformation behaviour and differences between timber and concrete
Publicerad
Författare
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The population of Sweden increases every year, requiring more housing and a
further developed infrastructure, thus densifying the cities. One solution to increase
the amount of housing while preserving green areas within the city is to build taller
buildings. The interest of using timber in buildings has increased in recent years,
mainly due to its environmental benefits. However, a pure timber high-rise building
present limitations and challenges which introduces a solution combining different
materials. A building with a mix of different materials is called a hybrid building.
Timber-concrete hybrid structures present challenges. Aspects to consider are
different material properties, construction processes, structural systems and their
elements as well as joints between elements. The thesis work aimed to analyse vertical
deformations in a tall hybrid building of mainly timber, with a concrete core.
Deformation differences that arises when timber is connected to concrete have been
investigated for time dependent loads and surrounding climate conditions. Possible
solutions to minimize the differences have been suggested.
The work of the thesis started with a literature study to acquire understanding
of the topic and to establish a basis for the analysis of vertical deformations.
Structural components were dimensioned and based on the literature study and material
models were created in MATLAB. Lastly, a parametric as well as a general study
were performed on a fictitious building. The parametric study consists of six
different scenarios and the result is showed with a plot of deformation over time for a
bottom column or wall element.
The general analysis shows that differences of deformations between the timber and
concrete components will occur along the height of the building. The total number
of floors determines how large the differences will be and also where along the height
the maximum difference will emerge. From the parametric study, the most efficient
parameters to adjust to reduce the differences are the timber strength classes as well
as the timber component dimensions.
Beskrivning
Ämne/nyckelord
hybrid structure, timber, high-rise building, vertical deformations, long-term behaviour