Reinforced Concrete
Mostrando 25-36 de 419 artigos, teses e dissertações.
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25. Computational algorithm for the verification of reinforced concrete sections in fire situation
Resumo As estruturas de concreto armado podem ter sua capacidade resistente reduzida devido à degradação de suas propriedades mecânicas com a temperatura, aumentando o risco de colapsos estruturais. Assim, o dimensionamento de uma estrutura deve considerar seu comportamento em temperatura ambiente e em situação de incêndio (ABNT NBR 14432:2001). Neste
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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26. Experimental study of concrete mixtures to produce UHPRC using sustainable brazilians materials
Abstract An experimental study is presented to produce Ultra High Performance Reinforced Concrete (UHPRC) with sustainable materials produced in Brazil. A complete factorial arrangement was defined and five controllable factors were selected based on the literature review. Cylindrical specimens were tested at 7, 14 and 28 days of curing, with and without hea
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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27. Flexural behavior of hybrid GFRP - concrete railway sleepers
Resumo Este trabalho tem por objetivo apresentar o comportamento à flexão de vigas híbridas de GFRP (glass fiber reinforced polymer - polímero reforçado com fibra de vidro) e concreto para aplicação em dormentes ferroviários. Pretendeu-se obter dormentes com adequada resistência mecânica, não susceptíveis à corrosão, duráveis e mais leves que
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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28. Concrete block structural masonry beam shear design: theoretical and experimental analysis and recommendations to the brazilian standards
Resumo Vigas são submetidas à flexão e cisalhamento, sendo esse último esforço o tema desta pesquisa. O objetivo deste trabalho é analisar especificações para dimensionamento ao esforço cortante de vigas de alvenaria estrutural em blocos de concreto, a partir de extensa avaliação da literatura e de ensaios experimentais aqui relatados. A partir de
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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29. Investigating the Effect of Curing in the Chloride Diffusion Coefficient of Conventional Concrete
Concrete is the most used material in the construction industry worldwide. Built concrete infrastructure is exposed to specific environments conditions during the asset’s life, which impose chemical and physical actions that may lead to premature deterioration. Poor concrete durability and corrosion of reinforcement bars are the primary cause of structural
Mat. Res.. Publicado em: 16/09/2019
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30. Uma abordagem experimental e numérica para determinação de curvas de compressão para concreto simples e reforçados com fibras de aço
RESUMO A curva tensão-deformação do concreto é importante para o dimensionamento de estruturas, pois por meio dela é possível obter sua resistência à compressão, sua deformação de pico, o módulo de elasticidade e a tenacidade do concreto. Entretanto, essa é uma propriedade que não é comumente determinada nos ensaios de controle de qualidade do
Matéria (Rio J.). Publicado em: 16/09/2019
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31. An Anchorage System for Enhanced Bond Behavior between Carbon Fiber Reinforced Polymer Sheets and Cracked Concrete
Abstract The contribution of CFRP wraps, as an anchorage system, to enhancing bond behavior between CFRP sheet and cracked concrete, was investigated. Thirty six concrete blocks (150 x 150 x 200 mm) were cast with 3ϕ12 mm steel bars embedded laterally at different spacing along the 200-mm-dimension. Half of the moist-cured blocks were subjected to a cyclic
Lat. Am. j. solids struct.. Publicado em: 05/09/2019
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32. Beam-Column Joints Reinforcement Detailing Adequacy in Case of a Corner Column Loss-Numerical Analysis
Abstract This study investigates the behavior of reinforced concrete (RC) beam-column joints at the corner panel after a ground corner column loss scenario. The ductility of a frame is dependent on the ductility of its components, particularly its joints. Deficiency in joints performance can be related to an unexpected event. For example, the removal of a gr
Lat. Am. j. solids struct.. Publicado em: 15/08/2019
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33. Multi-scale representation of plastic deformation in fiber-reinforced materials: application to reinforced concrete
Abstract Here we present a multi-scale model to carry out the computation of brittle composite materials reinforced with fibers, and we show its application to standard reinforced concrete. The computation is carried out within an operator-split framework on the macro-scale, which allows for different failure mechanisms to develop in separate phases, as both
Lat. Am. j. solids struct.. Publicado em: 12/08/2019
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34. Evaluation of low-cost MEMS accelerometers for SHM: frequency and damping identification of civil structures
Abstract Sensing techniques based on accelerometers for modal parameters identification are among the most studied and applied in Structural Health Monitoring of civil structures. The advent of low-cost MEMS accelerometers and open-source electronic platforms, such as Arduino, have facilitated the design of low-cost systems suitable for modal identification,
Lat. Am. j. solids struct.. Publicado em: 12/08/2019
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35. Crack and mechanical behavior of CFRP plate-reinforced bridge roofs under high temperature with different anchoring measures
Abstract This paper investigates the crack and mechanical behavior of CFRP plate-reinforced bridge roof under high temperature with different anchoring measures. Six CFRP-reinforced test beams with different anchoring schemes were designed and constructed. The beam specimens, after the high temperature effects, were tested under four-point bending loads. The
Lat. Am. j. solids struct.. Publicado em: 22/07/2019
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36. Durability of Concrete After Fire Through Accelerated Carbonation Tests
Degradation of mechanical properties and durability of reinforced concrete structures occur when they are subjected to fire situations, depending on the characteristics of the material, fire duration and the ways of fire extinguishing. Mechanical properties such as compressive strength, tensile strength and elasticity modulus are some examples of typically a
Mat. Res.. Publicado em: 18/07/2019