The present work describes the practical approach of structural modelling based on the example of
the Olympic Tower in Munich, followed by an investigation of the aeroelastic structural properties un-
der turbulent wind. Numerous wind and pressure measurements, which were carried out within the
publication series „Contributions to the Application of Aeroelasticity in Civil Engineering“ („Beiträge
zur Anwendung der Aeroelastik im Bauwesen“) as well as the wind load standard DIN-EN-1991-1-4
valid in Germany, serve as reference. The numerical structure and flow simulations are performed
with the finite element code Kratos Multiphysics.
A comparatively exact representation of the tower geometry using Reissner-Mindlin shell elements
is compared with simplified beam systems of the single and multiple degree of freedom oscillator.
Due to some discrepancies of different references regarding the structural properties, detailed inves-
tigations for the determination of mass and stiffness distributions are performed. These influence to
a significant extent the dynamic properties of a structure, which is why the models are verified with
eigenvalue analyses and damping studies. It can be seen that the vibration behaviour of the steel
antenna is almost completely decoupled from the rest of the tower and that the natural frequencies
of the selected assumptions are within the range of the measurements. The wind conditions pre-
vailing in Munich can be determined with the help of the available measurements at the Olympic
Tower and accessible recordings of the German Weather Service. With these data, a wind profile
according to DIN-EN-1991-1-4 is modified to allow a comparison with the actual wind speeds. In
addition, turbulent fluctuations are generated with the help of numerical methods.
In addition to a static wind load approach according to the standard, several one-sided and two-
sided coupled wind simulations are carried out, both with the mean modified wind profile and the
turbulent flow. The clearly overestimated reaction forces in the direction of loading compared to
the measured values are most likely the result of wind direction and environmental conditions. This
assumption is confirmed by comparing further measurement. The deviations from one-sided and
two-sided coupled simulation are negligibly small for the relatively stiff Olympic tower. Dynamic in-
creases resulting from the gust portions can only partly be represented by calculated gust reaction
factors after the investigations of this work. This is largely due to the insufficient number of wind mea-
surements evaluated. For the assumptions according to the standard, results can be determined on
the safe side.
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The present work describes the practical approach of structural modelling based on the example of
the Olympic Tower in Munich, followed by an investigation of the aeroelastic structural properties un-
der turbulent wind. Numerous wind and pressure measurements, which were carried out within the
publication series „Contributions to the Application of Aeroelasticity in Civil Engineering“ („Beiträge
zur Anwendung der Aeroelastik im Bauwesen“) as well as the wind load standard DIN-EN-1991-1-4
v...
»