An aerodynamic and aeroelastic experimental study on a sectional and three-dimensional rectangular tall building

Abstract

This paper examines the aerodynamic properties of a rectangular tall building with sharp edges. The building has a section aspect ratio B=D D 2:6 and a height aspect ratio H=D D 9, giving in a quite slender prismatic configuration. The study was performed on sectional and three-dimensional models of the building. The sectional model was tested in a smooth flow condition, and the aerodynamic coefficients of the section were determined. Forces and pressure distributions were measured on the three-dimensional model to compare with the aerodynamic behavior of the sectional model. Both a rigid (non-moving) and a moving model of the building were tested to analyze possible aeroelastic effects. Different levels of incoming wind turbulence were tested, since this is a key parameter in the aerodynamic behavior of the rectangular prism. Copyright or more recently, Li and Melbourne (1995) have studied the effects of the free stream turbulence on the mean pressure distribution along the separation shear layer formed on a flat plate with rectangular leading edges geometry. They showed that the main effect of the turbulence is to shorten the separation bubble, which corresponds to earlier reattachment of the separated shear layer. These alterations directly affect the pressure field on the afterbody side B, resulting in steeper mean pressure recoveries and consequently affecting the lift and drag coefficients. Flow visualization indicates that the mean reattachment position is between the peak of the mean and the peak of the standard deviation of the pressure distribution. More studies on large negative peak pressures, which are very important in wind engineering, occurring in the forward part of the separation bubble can be found in, e.g. Melbourne (1997,1989);Cherry et al. (1984).The effect of the integral length scale has also been studied, but it was found that its effect is much less than that of incoming wind turbulence (Haan et al., 1998;Li and Melbourne, 1995;Lee, 1975). Lastly, the aerodynamic behavior of a prismatic rectangular building in a boundary layer flow is similar to the two dimensional case but has many additional complexities resulting from the model end-effects and the vertical wind speed and turbulence profiles. Some studies on this have been presented, e.g. by Matsumoto et al. (1998);Surry and Djakovich (1995).Many studies considering the dynamic of the prism have also been published. In fact, the rectangular section can be subjected to vortex shedding as well as galloping oscillations. The dynamic problem is very complex, and the most significant parameters governing the system are again the elongation ratio B=D, the wind velocity V , the angle of attack of the prism˛and the level of incoming wind turbulence ( Table 1 shown the list of the main symbols).Vortex shedding generates vortex-induced vibrations (VIVs). It is a well-known phenomenon that produces narrow bandwidth fluctuating lift excitation, mainly governed by the Strouhal number St Studies on VIV can be found in, e.g. (Matsumoto, 1999;Shimada...

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