Abstract
Neste trabalho, apresenta-se a metodologia utilizada e os resultados da análise do comportamento de vigotas armadas e reforçadas externamente à flexão com manta de PRFC (polímeros reforçados com fibras de carbono). Avalia-se o comportamento do reforço de vigotas de concreto comum e compara-o com o do reforço de vigotas moldadas com um compósito cimentício à base de argamassa e fibras curtas de aço. O objetivo principal foi investigar a influência do compósito cimentício (escolhido sem maiores critérios) sobre o comportamento e o modo de ruína das vigotas reforçadas. Para tanto, uma série de ensaios de flexão em três pontos em seis vigotas foi conduzida, além dos ensaios de caracterização dos materiais: ensaios de flexão em três pontos em corpos-de-prova prismáticos entalhados, ensaios de tração em barras de aço e ensaios de compressão axial em corpos-de-prova cilíndricos. Adicionalmente, uma análise de elementos finitos foi desenvolvida com objetivo de comparar os resultados obtidos com os experimentais. O ganho de tenacidade e de resistência à fissuração provocou mudanças significativas no desempenho da vigota moldada com fibras e reforçada quando comparada com a vigota reforçada de concreto comum.
Highlights
The use of CFRP has been continuously increased in cases of structural strengthening throughout the world in the last decade
In this study we present the methodology and the results from the analysis of behavior of reinforced beams and externally strengthened until the flexural with sheet of CFRP.The strengthening behavior of common concrete beams is analyzed and compared with the strengthening of beams molded with mortar cement composite and short steel fibers
The main objective was to investigate the influence of cement composite on the behavior and failure mode of the strengthened beams
Summary
The use of CFRP (carbon fiber reinforced polymers) has been continuously increased in cases of structural strengthening throughout the world in the last decade. Its use from the standpoint of structural mechanics, presents an inconvenient related to its efficacy and security, which is its fragile and premature debonding in reinforce-concrete linkage region Such failure, if not considered in the project, can decrease the efficacy of strengthening significantly (Ferrari [1], Buyukozturk [2], Wu [3]). The presences of these fibers can not improve the matrix strength, maintain a load of capacity post-cracking and supports deformations larger than the single matrix, as shown in Figure [2] In This way, this study investigates the influence of a cement composite mortar and short steel fibers-based on the behavior and failure mode of strengthened beams. DE HANAI vance of cracks provided by the cement composite can lead to significant changes in the structural performance of strengthening when compared to strengthened beams molded with common concrete
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