Studies on Effect of Wind Induced Pressure on Varying Front and Lateral Faces of ‘C’ Shape of Building

Abstract

Due to unavailability of land and considering the architectural aspect now a days buildings are constructed as irregular in plan. The wind force act in a different manner according to the plan of the buildings. So it is the prime concern to study wind force or more precisely the wind pressure on irregular plan shaped tall buildings. To solve this issue comprehensive study has been carried out in this research paper. This paper demonstrates the variation of pressure coefficient on C plan shape model with varying frontal and lateral dimension. This study has been carried out experimentally on C shape model made of perpex sheet in a subsonic low speed wind tunnel .The numerical analysis is carried out with the help of CFD. Mean wind pressure coefficient on different faces of the buildings for different angle of incidence between 0 ͦ to 180 ̊at an interval of 30 ̊ are determined using wind tunnel test. Fluctuating values of wind pressures are measured at various tapping points on all surfaces of models and mean, maximum and minimum values of pressure coefficients are evaluated. The accuracy of the numerically predicted results is measured by comparing results predicted by CFD with experimental results and it seems to have a good agreement with wind tunnel results. Besides wind pressures, wind flow patterns are also obtained by CFD for all the wind incidence angles. These flow patterns predict the behaviour of pressure variation on the different faces of the building. For better comparison of the results, pressure contours on all the faces are also predicted by both the methods. Certain faces were subjected to peculiar pressure distribution due to irregular formation of eddies caused by the separation of wind flow. k-є models were used for numerical study to simulate the wind flow. . The position and magnitude of the measured peak pressure co-efficient vary considerably with wind direction. It is also observed that varying the plan dimensions considerably affects the wind pressure distributions on different faces of the building models.The effectiveness of the model shape in varying the surface pressure distributions is assessed over an extended range of wind directions.