Experimental study on the wind load characteristics of high-rise buildings considering the aeroelastic effect of interference

To examine the impact of mutual interference between buildings on the wind loads acting on disturbed structures, a study was conducted using two identical square-section ultrahigh-rise buildings with a height-to-width ratio of 6:1. The wind tunnel pressure test considering aeroelastic effect was carried out. The results indicate that the influence of the aeroelastic effect is significant when the interfering building is positioned obliquely upstream or in a juxtaposed configuration. Then, the presence of upstream buildings reduces the mean pressure coefficient (C_{P, mean}) of the disturbed building. However, when the interfering building is positioned directly upstream, the interference effect leads to an increase in the root mean square of the pressure coefficient (C_{P, rms}) at most corner points of the disturbed building. Regardless of how the wind angle changes, except for some locations upstream of the interfering building, the extreme value of the wind pressure coefficient of the disturbed building often appears near the corner of the windward side of the building. The interference from different positions has varying effects on the mean aerodynamic force coefficients. Specifically, interference from an upstream oblique position increases the mean lift coefficient (C_{L, mean}) of the disturbed building, whereas interference from a downstream oblique position increases the mean drag coefficient (C_{D, mean}). The power spectrum of the aerodynamic force coefficients is most notably influenced by a building positioned directly upstream. Furthermore, as the wind direction angle increases, the changes in the power spectrum become more pronounced.