Comparative study of wind induced mutual interference effects on square and fish-plan shape tall buildings

This paper deals with comparative study of wind-induced mutual interference effects on twin Square and Fish- plan shape building models having equal volume. Wind induced pressure and force is measured through experiments under boundary layer wind tunnel for interference and isolated wind incidence condition with building model of scale 1:300. For isolated condition’s study two wind incidences i.e. 00 and 1800 is considered whereas; for interference conditions five different orientation of twin interfering building models are considered. The distance between the twin building models is fixed at 10% of the height of principal model. The variation of coefficient of wind pressure on different surfaces of the model is shown by contour plots. To examine the mean variation along the faces Face-Average Cp has been calculated, plotted and discussed to a great extent. The interference study is done in order to understand the effects of different conditions that can arise in real life situations and the differences associated with them. The concluding remarks states the dominance of Drag and Lift forces at isolated 00 and 1800 wind incidences for Fish- plan shape model and at isolated 00 wind direction at Square shape model. Also, the overall efficiency in terms of Base shear of principal building is enhanced due to interference effect; with maximum efficiency exhibited by Back-to-Back wind interference condition when only Fish- plan shape model is considered. Overall, maximum efficiency in terms of induced wind pressure and base shear is exhibited by Square- plan shape model at Full Blockage condition.