Indexed by:期刊论文

Date of Publication:2011-12-01

Journal:Structural Design of Tall and Special Buildings

Included Journals:EI、Scopus

Volume:20

Issue:8

Page Number:902-910

ISSN No.:15417794

Abstract:Modern tall buildings using innovative structural systems and high-strength materials tend to be slender and lightly damped. Hence, they are vulnerable to the dynamic action of wind. Crosswind excitation on tall buildings can result in aeroelastic problems. Vortex-induced vibration (VIV) is the prime problem in self-excited vibration of the flexible structures, and it should be especially observed in order to avoid the ultimate limit state in the design stage. In order to predict the vortex-induced response of a supertall building in China with the single-degree-of-freedom (SDOF) mathematical model, wind tunnel tests were carried out with an improved aeroelastic model according to the similitude. The measured top acceleration of the structure showed that VIV was quite significant at some wind speeds and should be considered in the design. Based on the experimental data, the aerodynamic parameters were determined and the characteristics of VIV were investigated in some details. The time history of acceleration at the lock-in wind speed was then obtained using the Runge-Kutta method with the SDOF model. The numerical results are in accordance with the measurements. ? 2009 John Wiley & Sons, Ltd.