PARTICULARITIES OF THE DESIGN OF REINFORCED CONCRETE STRUCTURES OF WIND TURBINES UNDER DIFFICULT SEISMIC AND FOUNDATIONS CONDITIONS


Tuesday June 28th, 2011

The performance in Romania of an increasing number of wind energy turbines, with towers taller than 100 m, imposes upon structural design engineers the

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obligation to analyse certain specific aspects related to design loads (due to earthquakes and wind), as well as to difficult foundation conditions. Comparisons need to be made with respect to the application of the provisions concerning seismic design computation laid down by the Romanian technical regulations in force, and of those laid down by European regulations, accounting as well

for the data obtained through seismic micro-zoning. The particularities of geo-technical investigations stand outP11-101 in case the turbines are placed on moisture-sensitive soils or on grounds affected by instability phenomena (carst), the foundation solutions adopted in such situations being presented. The article emphasizes the need for a thorough checkout of the computations upon which the dimensioning of the standard structures provided by suppliers have relied, as the seismic and geotechnical conditions in many sites in Romania may require the re-design of certain basic elements of these structures in order to choose the optimal solution based on the actual location.