A study on vortex-induced vibration of supertall buildings in acrosswind

摘要

Modern tall buildings using innovative structural systems and high-strength materials tend to be slendernand lightly damped. Hence, they are vulnerable to the dynamic action of wind. Crosswind excitation onntall buildings can result in aeroelastic problems. Vortex-induced vibration (VIV) is the prime problem innself-excited vibration of the fl exible structures, and it should be especially observed in order to avoid thenultimate limit state in the design stage. In order to predict the vortex-induced response of a supertall buildingnin China with the single-degree-of-freedom (SDOF) mathematical model, wind tunnel tests were carriednout with an improved aeroelastic model according to the similitude. The measured top acceleration of thenstructure showed that VIV was quite signifi cant at some wind speeds and should be considered in thendesign. Based on the experimental data, the aerodynamic parameters were determined and the characteristicsnof VIV were investigated in some details. The time history of acceleration at the lock-in wind speednwas then obtained using the Runge–Kutta method with the SDOF model. The numerical results are innaccordance with the measurements. Copyright © 2009 John Wiley & Sons, Ltd.