S.J. Zan

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

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.

Wind tunnel study of an oscillating tall building

Abstract A wind tunnel investigation was performed in the 9 m × 9 m wind tunnel of the National Research Council of Canada (NRC) by the Applied Aeerodynamics Laboratory of the NRC, in collaboration with the Fujita Corporation of Japan. Its purpose was to measure the modal load spectra and the aerodynamic damping of a 2.5 m tall model of a proposed 500 m tall building as a function of reduced velocity, amplitude of building motion, and wind direction. The motion of the building was controlled by an hydraulic actuator and the unsteady loads were obtained from surface pressure measurements. This paper presents selected results for the cross-wind motion only.

Parametric investigation of wind-induced cable-stayed bridge motion using an aeroelastic model

Abstract This paper presents the results of an aeroelastic model test of a cable-stayed bridge. The model, built at a geometric scale of 1:75 was tested in the National Aeronautical Establishments (NAE) 9 m x 9 m low speed wind tunnel (Ref. 1). Nine deck section configurations were tested in three different flows; two of which were properly scaled atmospheric turbulence, and the third being smooth flow.