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1 2003

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Long and short periodic deformations of slender structures caused by temperature and wind

Breuer P., Chmielewski T., Górski P., Konopka E., Tarczyński L.

Zeszyty Naukowe. Budownictwo / Politechnika Opolska

2003

z. 47

87-102

Elastic deformations of two high-rise towers caused by wind and sun radiation were evaluated by surveying methods using GPS and levelling. Oscillations by wind mostly occur perpendicular to the wind direction as predicted by the Karman Effect. The frequency of these oscillations appears to be independent of the wind velocity. The influence of sun radiation leads to an elastic deformation in a period of 24 hours in the form of a slim ellipse. The diameter of that ellipse in the East-West direction is twice as large as in the North-South direction. The velocity of displacement is controlled by the intensity of the sun's rays. GPS methods for positioning and levelling for height recording lead to identical deformation results. The geodesic suweying results should be considered in relation to the parameters of the static construction due to Civil Engineering and to the results of physical surveying melhods.