Vorgespannte Betontürme für Windenergieanlagen: Einflüsse nichtlinearer Materialeigenschaften auf die Eigenfrequenzen als Entwurfskriterium

Pre‐stressed Concrete Towers for Wind Energy Turbines: Influences of non‐linear Material Properties on the Eigenfrequencies as a Design criterion The fast increase of the wind energy market in Germany promoted a dynamic development of wind turbine technology in the last decades. New concepts in the fields of construction, control and generation resulted in improved quality and efficiency of the wind turbines. With the growing rotor size and tower height new questions arise for the structural engineers and the building companies. In order to distribute the large forces at the tower‐head down to the soil and to balance the eigenfrequency of the structure with the excitation of the wind‐turbine, in general pre‐stressed concrete towers are necessary in case of tower heights beyond 100 m. The present paper will summarize the main design criteria for such towers and will explore the influences which are relevant for a reliable dynamic design.