Numerical Analysis of Wind Load on Rectangular Shape Tall Buildings

The development of high strength concrete, higher grade steel, new construction techniques and advanced computational technique has resulted in the emergence of a new generation of tall structures that are flexible, low in damping, slender and light in weight. These types of flexible structures are very sensitive to dynamic wind loads and adversely affect the serviceability and occupant comfort. This paper presents the results of Computational Fluid Dynamics technique using Ansys CFX software on rectangular building models having the same plan area and height but different side ratios of 1.25, 1.5, 1.75, 2.00 and 2.25. The wind pressure coefficients on all the models were evaluated from pressure records obtained from software under boundary layer flow for normal wind directions. 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.