Estudo de ações do vento em coberturas planas isoladas

Abstract

During the process of structural design of buildings, one of the biggest challenges is to determine the efforts arising from the air flow over the structure. However, the geometry of the structure and the availability of obstacles around it cause a variation in the pressure gradients to which the structure is subjected. The isolated flat roof, which is commonly used for the construction of fueling stations, has a limited scope in terms of its dimensioning, and due to the recurrence of claims of this type of structure becoming increasingly larger, the opportunity to carry out this project was seen. Study whose main theoretical purpose is to analyze the fluid dynamic flow of air and to identify the magnitude of the variation in pressure gradients as a function of different scenarios. To help obtain pressure gradients, numerical simulation tools and structural modeling programs will be used. The analyzes will be made using a simple structure geometry and varying the flow direction and the positioning of possible obstacles. The internal pressure values obtained through numerical simulations carried out by the ANSYS software were compared to each other to determine which was the best and worst case. With the obtained results, it was noticed the influence of the incidence of the flow with the variation of the pressure gradient. In cases where one or more obstacles are present, the variation can become even bigger.