P 298 - Static and dynamic deformations of steel radio masts
The subject of the research project was radio masts in steel and reinforced concrete construction, as they are currently used for the nationwide expansion of mobile phone networks. The static and dynamic deformation …
Content
- Publication
- 1999
- Authors
- Dipl.-Ing. Ch. Kammel, Prof. Dr.-lng. G. Sedlacek, Dipl.-Ing. W. Langer
The subject of the research project was radio masts in steel and reinforced concrete construction, as they are currently used for the nationwide expansion of mobile phone networks. The static and dynamic deformation behaviour under the influence of wind was to be investigated up to the serviceability limit state. For long-term observations and measurements, five original masts were selected as examples from the variety of competing construction methods - in a steel, a spun concrete solid wall construction and in three different steel lattice designs. At the same time, model tests were carried out in the boundary layer wind tunnel.
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By analysing the measurement results with regard to the maximum twist angle at the top of the mast and the duration for which the permissible change in the deflection angle was exceeded, reliable frequency curves were to be obtained. They should also include strong wind events or allow conclusions to be drawn about their effect by extrapolation. Both original measurements and modelling tests showed that the stresses and deformations calculated on the basis of existing design concepts could not be achieved under any circumstances. On the basis of these investigations, a new concept was proposed which is orientated towards the design philosophy of the Eurocodes. For the design of radio masts in the serviceability limit state under the influence of wind, the previously valid arbitrary deterministic criterion of half the dynamic pressure without gust reaction is no longer used. Instead, the assessment is carried out on the basis of the frequency with which the operator authorises exceeding the radiation limit angle as a result of the probability of extreme wind situations. According to the newly gained knowledge, there is still potential for optimisation in the design of new structures for all construction methods in steel and reinforced concrete. It is also expected that design reserves can be demonstrated on existing radio masts, which the mast operators can utilise for retrofitting with additional antennas. Due to the planned development of areas with little infrastructure, capacity expansions and the addition of new network providers, a high demand for radio mast construction projects can be expected in the medium term. In the long term, the Europe-wide expansion of mobile communications networks will be at the centre of construction activity. Due to the large quantities of steel required, regardless of the chosen construction method, there is a large market for German steel construction. STUDIENGESELLSCHAFT STAHUNWENDUNG e.V.
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P 298 - Static and dynamic deformations of steel radio masts—
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