A Study on Aerodynamic Damping and Aeroelastic Instability of Helical-shaped Super Tall Building

나선형 초고층건물의 공력불안정 진동과 공력감쇠에 관한 연구

Kim, Wonsul;Yoshida, Akihito;Tamura, Yukio;Yi, Jin-Hak
김원술;아키히토 요시다;타무라 유키오;이진학

  • Received : 2014.11.02
  • Accepted : 2015.12.17
  • Published : 2016.02.28


In this paper, aeroelastic instability and aerodynamic damping ratio of a helical $180^{\circ}$ model which shows better aerodynamic behavior in both along-wind and crosswind responses on a super tall building was investigated by an aeroelastic model test, and the aerodynamic damping ratio was evaluated from the wind-induced responses of the model by using Random Decrement Technique. Aerodynamic damping ratios evaluated in this study were verified through comparison with previous results obtained by quasi-steady theory. As a result, the aeroelastic instability of the helical $180^{\circ}$ model in crosswind direction were not occurred for any conditions with increasing the reduced wind velocity while the square model generally encounters aeroinstability due to the vortex shedding. The aerodynamic damping in along-wind direction for the helical $180^{\circ}$ and the square model increased monotonically both with reduced wind velocity, i.e., there is no relation with modifications of building shapes. On the other hand, in crosswind direction, the characteristics of aerodynamic damping ratio with reduced wind velocity for helical $180^{\circ}$ model were quit different from those of the square model.


aeroelastic instability vibration;aerodynamic damping;crosswind response;along-wind response;random decrement technique;tall building;wind tunnel test


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Supported by : 국토교통부, 한국해양과학기술원