Experimental Study of Spectral Characteristics of Fluctuating Wind Loads on High-Rise Building with Rectangular Section

In order to study the effects of wind field characteristics and side ratio of rectangular section on the spectral characteristics of fluctuating wind loads for rectangular high-rise buildings, the pressure fluctuations on a stationary rigid model with cross configurations of 1:2 and 2:1 were measured by wind tunnel test for synchronous pressure measurement in simulated atmospheric boundary layer. Referring to the spectral model given by the Architectural Institute of Japan (AIJ), a simplified spectral expression of fluctuating across-wind loading of rectangular high-rise building was proposed by fitting the measured results. The experimental results show that the fluctuating along-wind load is mainly caused by longitudinal turbulence, and the spectrum of fluctuating along-wind load is consistent with those of incident turbulence. The formation mechanism of fluctuating across-wind loads is more complex, and there is vortex shedding, separation or reattachment on the sides of the rectangular prism. The dimensionless power spectral density and the Strouhal numbers are almost constant along the height. The values of Strouhal number are 0.128 and 0.069 7 respectively for the side ratios of 2:1 and 1:2.