Estudo Comparativo de Pilares de Concreto Armado Reforçados com Aumento da Seção Parcial com Diferentes Tipos de Conectores

Abstract

With the growing number of degraded structures and the consequent increased need for rehabilitation, structural reinforcement becomes an effective solution to ensure the safety and durability of buildings. Among the most common techniques is concrete casing and additional reinforcement, whose effectiveness depends on good adhesion between the old and new concrete, often provided by metal connectors. The overall aim of the research was to evaluate the performance of columns reinforced with increased cross-section and reinforcement with connectors, considering load capacity, stiffness and failure modes, taking into account the impact of using different types of connectors. To this end, a literature review was carried out of experimental studies by authors such as Takeuti (1999), Omar (2006), Sahb (2008), Nascimento (2009), Marques (2014), Ferreira (2014) and Virgens (2015), who investigated the behavior of columns subjected to flexion-compression with different reinforcement configurations. Analysis of the results showed that although the reinforcement provides a significant increase in strength and stiffness, there is a need to improve the form of rupture to ensure greater structural safety. The adherence between the concretes and the anchoring of the connectors proved to be fundamental in this process. Anchor bolt type connectors, pin type connectors and open stirrups were used with varying performance, indicating that the rate and distribution of these elements directly influences the effectiveness of the reinforcement. The conclusion is that reinforcing columns by partial encasement is an efficient technique, as long as it is carried out with strict control of the materials and special attention to the interface between the concretes.