Reinforcement Tension
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Biocomposites of lignin-, tannin- and glyoxal- based polymeric matrices reinforced with natural fibers / Biocompósitos a partir de matrizes poliméricas baseadas em lignina, tanino e glioxal reforçadas com fibras naturais
The present study aimed at developing biocomposites combining polymeric matrices and reinforcement agents, employing the highest possible proportion of materials obtained from natural sources. Phenolic resins are widely known and used due to their excellent properties, such as dimensional and thermal stability, flame resistance and chemical resistance. Howev
Publicado em: 2010
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14. Efeito de fibras sintéticas nas propriedades de ligantes e concretos asfálticos
The asphalt cement plays a major role in hot mix asphalts (HMA) by bonding the mineral aggregates and conferring impermeability. Despite the relatively small percentage of asphalt cement in hot mixes, the mechanical properties of asphalt layers are highly dependent on the quality of the binder. The physical and rheological properties of asphalt binders can b
Publicado em: 2010
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15. Evaluation of the mechanic behavior of fiber reinforcement in a fine sandy lateritic soil applies in pavement layers / Avaliação do comportamento mecânico de um solo arenoso fino laterítico reforçado com fibras para uso em pavimentação
The propose of this study is to evaluate the effect of the randomly distributed fiber reinforcement in the compression and tension resistances, deformability and resilient modulus of a fine sandy lateritic soil (FSLS) for base layer of pavements. Glass fibers and polypropylene fibers were studied. The first was added in contents of 0,5%, 1,0% and 1,5% with l
Publicado em: 2009
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16. Fabricação de malha de trama utilizada como pré-formas na indústria de compósitos e avaliação das propriedades mecânicas
In the manufacture of composite, textile materials are being used as reinforcement. Generally, the combination of the matrix with the textile material in the form of fibres or yarns is used depending on their distribution in the web. In the present work, in place of fibres or yarns, a knitted structure in the form of the final product which is defined as pre
Publicado em: 2009
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17. COMPORTAMENTO DE VIGAS DE CONCRETO ARMADO REFORÇADAS COM CFC SUJEITAS A CARGA DE IMPACTO / BEHAVIOR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CFC UNDER IMPACT LOADING
An experimental study on the behavior of reinforced concrete beams strengthened in flexure with CFC under impact load was carried out in this work. The main objective was to investigate the effects of the loading rate on the strength of the beams. The variables were the loading rate and the ratio of fiber to steel reinforcement cross sections. All beams were
Publicado em: 2008
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18. Comportamento de vigas levementes armadas em concreto de alto desempenho
This study presents the results of an experimental investigation of a set of 10 reinforced high performance concrete beams. The models were distributed in 5 series. Each series consisted of two beams with and without web reinforcement, except for one of the series, whose beams had only tension reinforcement. The primary design variable was the concrete compr
Publicado em: 2008
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19. ESTUDO EXPERIMENTAL DO REFORÇO À FORÇA CORTANTE DE VIGAS DE CONCRETO ARMADO COM COMPÓSITOS DE FIBRAS DE CARBONO / EXPERIMENTAL STUDY OF REINFORCED CONCRETE BEAMS STRENGTHENED FOR SHEAR FORCE WITH CARBON FIBER COMPOSITES
This analysis involves the experimental study of eight reinforced concrete beams of T section ( cm bw=15cm e h=40cm), with cm 300cm of length, bisupported and with the same longitudinal reinforcement, strengthened for shear force with carbon fiber composites (CFC). They were divided in two series of four beams, with a reference beam for each series, where th
Publicado em: 2008
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20. Mapeamento do processo mecanizado de soldagem unilateral FCAW com backing cerâmico aplicável no passe de raiz em aço carbono
This work aims to evaluate one-sided welding automatic using the flux cored arc welding process with ceramic backing in the root bead. The tests were performed using a KUKA KR-16, robot for welding in the flat position. The wire is the AWS A5.20-79 E 71T-1, with 1.2 mm diameter, V-groove butt joints were design to be used in steel plate ASTM A-36. The proces
Publicado em: 2007
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21. COMPORTAMENTO DE UMA ESCAVAÇÃO GRAMPEADA EM SOLO RESIDUAL DE GNAISSE / BEHAVIOUR OF A NAILED EXCAVATION IN GNEISSIC RESIDUAL SOIL
The behavior of a nailed excavation in gneissic residual soil has been studied by a comprehensive research program, including instrumentation, field and laboratory tests and numerical analyses. Soil nailing is becoming a popular stabilization technique in Brazil. However, a solid knowledge about the soil-nail interaction is still lacking. There are a few stu
Publicado em: 2007
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22. Simulação numérica do comportamento pós-fissuração de vigas de concreto armado pelo método dos elementos finitos / Numerical simulation for the post-cracking behavior of reinforced concrete beams by finite element method
This work presents a numerical method for the evaluation of internal forces and displacements in reinforced concrete straight beams considering cracking and the influence of longitudinal and transversal reinforcement. In order to simulate cracking behavior, the elasticity module of the cracked element is reduced depending on the dimensions of the finite elem
Publicado em: 2007
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23. COMPARAÇÃO DE MÉTODOS DE PROJETO PARA MUROS DE SOLO REFORÇADO COM GEOSSINTÉTICOS / COMPARISON OF DESIGN METHODS FOR GEOSYNTHETICS REINFORCED SOIL WALL
Atualmente, muitos projetistas utilizam diferentes métodos para o projeto de muros de solo reforçado com geossintéticos. Uma avaliação desses diversos métodos pode ser realizada pela comparação com os resultados obtidos do monitoramento de casos reais e suas respectivas retro- análises, sendo este o objetivo desse trabalho. Na presente pesquisa, tr�
Publicado em: 2007
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24. A improbidade processual da administraÃÃo pÃblica e sua responsabilidade objetiva pelo dano processual
Both the principle of the due process of law demand good will of the claimers, brought up by the veracity and the range of their statements, by the respect to the rights of other parties as well as to legal decisions through the abstention of delaying acts. The Brazilian Civil Code states the good will duty although it makes use of insufficient instruments o
Publicado em: 2007