Abstract:
Based on multi-degree-of-freedom (MDOF) aeroelastic model wind tunnel tests for super high-rise building, vortex induced vibration(VIV) displacement and synchronous wind pressure were measured. The aerodynamic damping at various reduced wind speeds was identified on the basis of random decrement technique. The frequencies of the vibration system and vortex shedding were respectively calculated by the power spectrum of the VIV response and synchronous pressure. The results show that the aerodynamic stiffness cannot be ignored with the reduced wind speed closed to resonance wind speed. More than, the relationship between the vibration frequency and the vortex shedding frequency cannot be recognized as a completely interlocked. The vibration frequency may be affected by the vortex shedding significantly when the reduced wind velocity is close to 10.5, and the system frequency is approximately equal to the vortex shedding frequency.