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Navegando por Assunto "Armadura transversal"

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    Efeito da adição de agregados reciclados na resistência ao cisalhamento de vigas de concreto armado
    (Universidade Federal do Pará, 2018-07-31) CARDOSO, Allan Carvalho; FERREIRA, Maurício de Pina; http://lattes.cnpq.br/4242041552985485
    The present work evaluates the influence of the incorporation of recycled concrete aggregate (RCA) on the shear strength of beams in reinforced concrete. An experimental analysis composed of twelve beams will be performed: four executed with conventional concrete (composed of natural aggregates) and eight with RAC. The experiment aims to evaluate the influence of the transverse reinforcement (ρw) and the variation of the longitudinal reinforcement ratio (ρl), on the shear strength of the parts. The concrete beams were divided into two groups, with RCA rates varying from 0 to 100%. In addition, three codes will be discussed: ACI 318 (2014); EUROCODE 2 (2004); NBR 6118 (2014) and MODEL CODE (2010), which will be applied to a concrete beams database (DB) with RCA. The performance of these codes will be evaluated through the parameter λ, by means of the relation between the ultimate experimental load (Vexp) and the theoretical ultimate load (Vteo), λ = Vexp / Vteo. This parameter was analyzed according to the level of conservatism and related to the main variables of this research: ρl, ρw and AGRC. The value of λ is analyzed according to the level of conservatism.
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    Influence of the supplementary reinforcement on the shear strength of beams with prefabricated truss stirrups
    (Instituto Brasileiro do Concreto, 2022) PINTO, Rosângela Silva; SOUSA, Vanessa Carolaine de; TAPAJÓS, Luamim Sales; FERREIRA, Maurício de Pina; LIMA NETO, Aarão Ferreira
    This paper presents the results of seven experimental tests in reinforced concrete wide beams, aiming to investigate their performance when subjected to shear, using prefabricated truss stirrups as shear reinforcement, as well as a supplementary reinforcement to control cracks by delamination. The main analysed variables were: position of the supplementary reinforcement, inclination of the shear reinforcement, and spacing between stirrups. Results showed that strength increments of up to 142% were obtained using the prefabricated truss stirrups. Furthermore, the experimental results were compared with the theoretical shear strength estimates of the tested beams, following the recommendations of NBR 6118 (2014), Eurocode 2 (2004), and ACI 318 (2014), in order to evaluate the safety level of these codes when designing concrete elements subjected to shear with the reinforcement used in this paper.
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