The evaluation of wind-induced vibration responses to a tapered tall building

The mitigation of wind-induced excitations of tall buildings was investigated. The shape of a building can be aerodynamically modified by changing the taper of the cross-section. This modification alters the flow pattern around the building, and reduces wind-induced vibration of tall buildings. A tapered tall building that spreads the vortex-shedding over a broad range of frequencies more effectively reduces cross-wind responses. In this paper, to investigate the tapering effect on the reduction of wind-induced responses of a tapered tall building, a high-frequency force-balance test was conducted. Six types of building model of differing taper ratios-2-5%, 5%, 7-5%, 10%, 15%, and a basic building model of square cross-section-were tested on two typical atmospheric boundary layers representing suburban and urban areas. The effect of wind direction was also considered.