Early estimation of a structural systems’ stiffness in high-rise buildings A development of guidelines in design for wind
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Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
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Sammanfattning
As our buildings grow higher so should the knowledge in the design of high-rise
buildings. Tall structures require specialised understanding due to the great impact
of wind load and subsequently the importance of stability. In the conceptual phase
of design, it is essential to make a good estimation of the required stiffness. Today’s
building standards generally provide a conservative geometry with overestimated
loads. A development of guidelines for the design of high-rise buildings in an early
stage are desirable and consequently the ambition of this thesis.
The aim of the thesis is to examine current methods of design in a comprehensive
analysis of high-rise buildings. By evaluating and comparing the design method by
building codes with the result from provided wind tunnel testing, new guidelines for
early assessment of a high-rise buildings’ structural system will be reached.
To accomplish this research different methods of analysis is carried out. To incorporate
current design approaches, interviews with structural engineers specialized in
tall buildings are conducted. An analytical analysis is conducted by current
building codes for design of high-rise buildings followed by a FEM analysis to investigate
required stiffness. The structural system response is evaluated by comfort criteria
which set the base for the development of new guidelines.
The research showed a distinctly difference of wind loads predicted by building
standards and wind tunnel testing. This resulted in a discrepancy between required
stiffness for different configurations of the structural system. Observing the results,
a development of guidelines for early estimation of a structural systems’ stiffness in
high-rise buildings were reached.
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Ämne/nyckelord
High-rise buildings, wind, building standard, wind tunnel test, FEM-modelling, stiffness, early estimation, building design