ESTIMATION OF AERODYNAMICS EFFECT ON LOW RISE DOMICAL STRUCTURES

Abstract

The wind is a complex phenomenon because of the many flow situations that result from wind interaction with structures. In designing buildings, it is important to take wind into account, since this is one of the more significant forces of nature. In time and space, the characteristics of wind-induced loads on buildings continually change. A building's design depends on predicting the actual effects of turbulent wind forces to account for the most critical design scenarios that may occur during a specific design period. Low-rise structures are susceptible to high winds alike tall structures. These low-rise structures are exposed to the atmospheric wind speed that is highly prone to uplift pressure. The present study demonstrates the investigation of mean wind pressure on isolated domical low-rise buildings, and the arrangement of domical low-rise buildings in a T-shape and L shape. The wind incidence angle is varied from 0 O to 180 O at an interval of 30 O for T shape and 0 O to 360 O at an interval of 30 O because of the asymmetric plan and the spacing between the buildings is varied at a distance of 0, b/2, b, 3b/2 and 2b where b is the width of the isolated building i.e. 0mm, 50mm, 100mm, 150mm and 200mm. We performed the numerical analysis using ANSYS CFX using the shear stress transport turbulence model. The pressure distribution over the surfaces using Coefficient of pressure (Cp) and velocity streamlines are analyzed for each building model, and the effect of interference on surrounding buildings is studied. The finding is useful for structural engineers when designing the structure of a low-rise building and the outcome of the study is depicted by pictorial and tabular representation. Interestingly, the maximum positive wind pressure coefficients were vi found on the windward side of the dome, whereas the maximum negative wind pressure coefficients occurred at the apex. The interference research was carried out in order to comprehend the consequences of various conditions that may emerge in real-life scenarios, and it was found that the maximum negative pressure is found to be on the centre of the domes which are directly hit by the wind and the value is found to be decrease in the corner region. For the variation of spacing, the average coefficient of pressure acting on each dome was found, and it was observed that the average pressure acting on the dome surface is suction for isolated, L shape and T shape domical roofs. The finding is useful for structural engineers when designing the structure of a low-rise building. As a result, it is important for designers and planners to study the wind induced response of the buildings.