Análise comparativa dos métodos de pro-tensão do concreto: pré-tensão/pós-tensão

Abstract

The work focused on prestressed concrete, a technique that uses internal beams of tensioned steel cables to increase the flexural resistance of the concrete piece, making it -up to three times more resistant than conventional concrete. This method is ideal for be used in large structures, such as bridges and viaducts, as it allows the creation of gaps larger, with fewer support pillars. The research compared pre-tension and post-tension methods, highlighting its advantages, costs and efficiencies. Pre-tensioning, common in prefabricated parts, tensions the cables before concreting, while post-tensioning occurs after the concrete reaches a certain initial strength. The analysis was based on standards of ABNT, especially NBR 6118:2014, and the study also cited examples of large works in Brazil that used prestressed concrete, such as the Rio-Niterói Bridge. The goal The final goal was to be able to make recommendations on which prestressing method to use, considering the characteristics of each engineering project.