Análise dos esforços atuantes em postes de concreto armado devido a cabos

Abstract

Reinforced concrete poles are structural elements initially developed to function as supports for overhead power grids and usually modeled as cantilever beams, where the bending effort is predominant. On November 24, 1999, The Joint Resolution No. 1 (Aneel, Anatel and ANP) was approved, and established that the excess capacity of the infrastructure from public utility companies could be granted for the use of telecommunications service providers. Over time, the evolution of technological means and the advancement of globalization led to an expansion of the telecommunications network, mainly leading to an increase in the size of the fiber optic network from the major operators and internet service providers. This has led to a growth in the number of cables in the poles, in a way that today you can see tangles of wires throughout the city. In this context, considering that the knowledge of the behavior of the pole as a structure is an essential premise to avoid accidents and damage, the present work aims to investigate this behavior, in a static way, of reinforced concrete poles used in distribution lines due to the action of cables. An analysis is made of Double T-section D-type poles measuring 9 m and 10.5 m, comparing their performance before and after the introduction of the conductors due to infrastructure sharing. The SAP2000, a software based on the finite element method, is used to model the supporting structures allowing the evaluation of stresses and displacements considering variable section along the height. Thus, it was possible to verify if these structures are prepared to support the loads acting on them nowadays, checking the service state limit requirements. In general, structures are overloaded when subjected to cable loading in end-of-line or corner situations, requiring reinforcement or replacement with more robust structures.