期刊
JOURNAL OF BUILDING ENGINEERING
卷 38, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jobe.2021.102248
关键词
Crosswind response; Vortex-induced vibration; Aerodynamic damping; Random decrement technique; Wind loading; Tall buildings
资金
- 111 Project [B18062]
- 1000 Foreign Experts Program in China [B13002]
- China Postdoctoral Science Foundation [2020M680639]
- Fundamental Research Funds for the Central University [106112017CDJQJ208849]
- National Natural Science Foundation of China [51720105005]
This study investigates the applicability of RDT in extracting aerodynamic damping of tall buildings. Models of linear and nonlinear aerodynamic damping are applied to simulate crosswind response, considering the effect of random wind load on the characteristics of crosswind response. Aerodynamic damping is extracted through two approaches and compared with target value to examine the accuracy and efficiency of RDT, while demonstrating the influence of varying wind loading spectra on amplitude-dependent aerodynamic damping.
At the vicinity of vortex lock-in wind speed, the nonlinear aerodynamic damping effect is significant. It can greatly promote the surge of crosswind response, even threaten structural safety and serviceability of tall buildings. Techniques dependent on experimental measurement to identify aerodynamic damping have been developed for estimating crosswind response from wind loading spectrum. Random decrement technique (RDT) as one frequently mentioned technique of system identification has been used in literature to extract aerodynamic damping from stochastic crosswind response, although it was originally suitable for linear single degree of freedom system with a constant damping ratio. This study investigates the applicability of RDT in extracting aerodynamic damping of tall buildings. The models of linear and nonlinear aerodynamic damping are applied to simulate crosswind response of a square section tall building. Accordingly, the wind loading spectra based on high-frequency-force-balance (HFFB) testing and the model recommended by AIJ are utilized respectively to consider the effect of random wind load on the characteristics of crosswind response. To examine the accuracy and efficiency of RDT, aerodynamic damping is extracted through two approaches and compared with target value. Moreover, the influence of varying wind loading spectra on amplitude-dependent aerodynamic damping is demonstrated.
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