Unsteady aerodynamic force measurements on a super-tall building with a tapered cross section

摘要

The unsteady wind loads acting on a super-tall building with a tapered cross section and beveled corners were measured as functions of reduced velocity and motion amplitude. The model amplitude was controlled by an hydraulic actuator and the unsteady sectional aerodynamic loads were measured using manifolded pressure taps. The damping components of the along-wind and cross-wind unsteady aerodynamic forces were obtained from the time histories of fluctuating aerodynamic force. The vertical distribution of damping component dependent on amplitude and reduced frequency are discussed. The obtained aeroelastic damping is compared with those from aeroelastic response measurement and those predicted by quasi-steady theory.