Análise experimental de pilares de concreto armado submetidos à flexo-compressão, reforçados com comcreto auto-adensável e chumbadores

• Autor(a) principal: SAHB, Keyla Fabrícia Pereira
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/001300000c1xf
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/668
• topic: Pilar. Reforço. Flexo-Compressão Reta. Concreto Auto-Adensável. Chumbadores.; Column. Strengthning. Flexural Compression. Self Compacting Concrete. Anchors.; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS::ESTRUTURAS DE CONCRETO

The reinforced concrete structures are subject to interference from many factors that affect its stability and its performance and may generate the need for interventions and eventual reinforcement. There are several techniques of enhancing that can be employed and in the case of columns, the increase of the section with reinforced concrete is quite usual. This type of enhancement requires the attendance requirements to ensure its effectiveness, among which stand out in importance: meeting the needs and characteristics of project, the appropriate sizing, and the adhesion between concrete of different ages. Although the reinforcement of structures involve risk situations, and in many cases, are costly and uncertain, does not exist in the country a specific normalization for their specific design and implementation, thus they have been executed considering the normative disposals for project and execution of structures of armed concrete and in personal experiences. This research was evaluated the behavior of reinforced concrete columns required to flexural compression, with an initial section of 120 mm x 250 mm and height of 2000 mm in the compressed section and enhanced with a layer of 35 mm of self compact concrete and anchors. Was varied the amount of anchors and kept the other variables such as the concrete strength of the original columns and the enhanced columns, the initial rate of reinforcement, the eccentricity of the load test, the thickness of the reinforcement and the preparation of the substratum method. The strengthened columns had presented increasing load by increasing the amount of anchors used in the interface between the concrete of different ages. The improvement in the performance of the interface was observed, slowing the sputting and in one case, the column with a larger amount of anchors, with the crushing of concrete and sputting, almost simultaneously. There was a reduction of displacements caused by the decrease in ductility. These evidences indicate that the adopted technique of reinforcement if showed efficient, promoting consolidation of the composed section better