Aero-elastic behavior of high-rise buildings under downstream interference effects

Abstract eng:
This paper investigates the effect of the single and multiple aerodynamic modification mechanisms on the dynamic behaviour of the principal building when it is interfered by a very closely located building. During the study, aeroelastic vibration tests and high-frequency force balance tests are conducted to compare responses and wind forces in a well-simulated turbulent boundary layer flow. The principal building is manufactured with three different building configurations to represent the single and multiple aerodynamic modification treatments; the neighbouring building which produces interference effects is made as a square prism model. Results show that the multiple modification treatment is efficient in reducing wind forces in all interference location series. However, it is also found that in some critical conditions, such treatment is sensitive to reduced velocity and may amplify the interference effect and result in larger displacements. INTRODUCTION Interference effects caused by neighbouring buildings require an improved wind load resistant design rather than those for isolated buildings. However, due to their complex nature and huge number of disturbances, the interference effects have been considered very difficult in regulation coding for practical use. The issue with the interference effects is still one of the most difficult research topics in the field of wind engineering. Over the past decades, researchers have adopted various methodologies to investigate the interference effects on overall or local wind loads of high-rise buildings. Factors that may affect the wind forces have been widely discussed, such as the approaching flow characteristics, wind directions, relative location of neighbouring buildings, cross sectional shapes and aspect ratios, Scruton numbers, Strouhal numbers, modal frequency, and mode shapes. Among these research works, square or rectangular prisms, as well as cylindrical prisms, chimneys, storage tanks, or cladding structures were commonly chosen for discussions. In most cases, interference effects were discussed based on the evaluation of distorted wind forces to indicate critical interference locations. However, it has been pointed out that different critical interference mechanisms could occur at certain interference locations, either at the upstream or the downstream, to generate significant responses (Bailey and Kwok, 1985;

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