Interference effects between two tall buildings with different section sizes on wind-induced acceleration

Wind-induced interference effects on the along-wind and across-wind acceleration responses between two tall buildings were detailed studied based on a series of pressure measurement wind tunnel experiments and response analyses. The modifications of acceleration response at the top of principal building from interference over a practical range of reduced velocities were represented by an enveloped interference factor (EIF). In this study, six types of interfering buildings were considered with breadth ratios (Br = 0.4, 0.6, 0.8, 1.0, 1.2 and 1.4) and the influences of approaching turbulence intensity were investigated. Furthermore, the interference mechanism to wake vortex-excited resonance were explored. As a result, amplification effects were mainly dominant not only for along-wind EIFs but also for across-wind EIFs. When Br equaled to 0.4 and 0.6, the maximum along-wind EIFs were 2.3 and 2.1, while the maximum across-wind EIFs were 3.0 and 2.1 because of wake vortex-induced resonance. Whether in along-wind or in across-wind direction, EIFs decreased with the increase in turbulence, and a strong linear correlation was discovered between low and high turbulences for all the breadth ratios. The interference mechanism of wake vortex-induced resonance to acceleration response, base moment response, and torsional response were the same for square section buildings.