Análise do comportamento estrutural de postes de concreto armado utilizados em linhas de transmissão de energia elétrica

Abstract

The use of reinforced concrete poles for electric power transmission lines has advantages with respect to the use of steel towers, such as more economic foundations; increased speed o assembly; need smaller area for installation; durability in the face of bad weather; higher fire resistance; lower maintenance and better visual appearance. However, its use is recent and the literature on the subject still scarce. This paper discusses broadly the criteria involved in the design of this type of structure and aims to demonstrate the structural calculation procedures and evaluate the performance of posts with different formats. In this, are designed poles with 23 meters high and different geometries: circular hollow section, rectangular hollow section and double Tsection, according to the Brazilian technical standards NBR 5422:1985, NBR 6123:1988, NBR 6118:2014 and NBR 8451:2011. Structural analysis of the poles is complemented with the development of numerical simulations with the aid of ABAQUS® software that is based on the Finite Element Method. The results obtained, such as efforts, stresses, deflections and weight of armor were compared in order to highlight the main advantages and disadvantages of each post format. As a result, it was found that for the proposed cases the pole with a hollow circular section absorbs less wind load, required the least amount of steel and also had the lowest rate of reinforcement, the pole with a double T section accused the greatest efforts but the lowest volume of concrete, the pole with a hollow rectangular section showed high consumption of materials and was the second heaviest structure