Abstract
This paper presents the results of wind tunnel tests on rectangular building models having the same plan area and height but different side ratios of 1, 1.56, 2.25, 3.06 and 4. The models were made from perspex sheet at a geometrical scale of 1:300. The wind pressure coefficients on all the models were evaluated from pressure records measured in a closed circuit wind tunnel under boundary layer flow for wind directions of 0° to 90° at an interval of 15°. The mean responses of rectangular tall buildings having different side ratios were also evaluated from the experimentally obtained wind loads. Effectiveness of side ratio of buildings in changing the surface pressure distribution and mean responses of prototype buildings is assessed for wind directions of 0° to 90° at an interval of 15°. It is observed that the side ratio of buildings significantly affects the wind pressures on leeward and sidewalls, whereas wind pressure on windward wall is almost independent of side ratio. Further, the wind incidence angles and side ratio of the buildings significantly affect its mean displacements as well as torque.
Highlights
This paper presents the results of wind tunnel tests on rectangular building models having the same plan area and height but different side ratios of 1, 1.56, 2.25, 3.06 and 4
The evaluated mean pressure at a particular tapping location is non-dimensionalized to evaluate the mean pressure coefficients along the considered wind direction by 1/2qv2, where q is the density of air (1.2 kg/m3), v is the free stream velocity at the roof level of the building model
The negative pressure coefficient becomes almost constant as the side ratio exceeds 3.0, indicating that when depth is about three times the breadth, the lower limit of the wake width, which is approximately the full width of the body, is obtained
Summary
During the past few decades, pressure distribution and responses of building models of specific plan shape have been investigated by many researchers through wind tunnel tests. Lee (1975) and Kareem and Cermak (1984) investigated the pressure distribution on side surfaces of a square model in the different boundary layer flow conditions of suburban and urban terrain. Li and Melbourne (1999) and Haan et al (1998) investigated the influence of turbulence length scale on the pressure distribution and the maximum or minimum pressure acting around rectangular model. Hayashida and Iwasa (1990) studied the effects of building plan shape on aerodynamics forces and displacement response of assumed super high-rise building. Katagiri et al (2001) studied the effects of side ratio on characteristics of across-wind and torsional responses of rectangular high-rise buildings through wind tunnel test. Amin and Ahuja (2013) investigated the effectiveness of the side ratio of models in changing the surface pressure distribution at wind incidence angle of 0° to 90° at an interval of 15° using wind tunnel studies on 1:300 scaled-down models of rectangular buildings having same plan area and height but different side ratios ranging from 0.25 to 4. Only few experiments to determine the wind forces on rectangular buildings having different side ratios but same cross-sectional area at different wind incidence angles are reported in the literature, pressure fluctuations and responses on a specific building have been studied. This study is attempt to provide the needful information of wind pressures and mean wind responses of rectangular buildings having same plan area and height but different side ratios over an extended range of wind incidence angles from 0° to 90° at an interval of 15°. Pressure measurements are restricted to open country type flow, as the mean responses are significant in flow similar to terrain category-II (IS: 875 (Part3), 1987)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
