Faculdade de Engenharia Civil - FEC/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2788
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Navegando Faculdade de Engenharia Civil - FEC/ITEC por Periódicos "Latin American Journal of Solids and Structures"
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Item Acesso aberto (Open Access) Experimental analysis of the efficiency of steel fibers on shear strength of beams(Associação Brasileira de Ciências Mecânicas, 2016-07) GOMES, Lana Daniele dos Santos; OLIVEIRA, Dênio Ramam Carvalho de; MORAES NETO, Bernardo Nunes de; MEDEIROS, Adelson Bezerra de; MACÊDO, Alcebíades NegrãoThe efficiency of steel fibers for shear strength of reinforced concrete beams is assessed. Four beams were evaluated: control consisted of one beam without any steel fibers and three beams with reinforced concrete with steel fibers. All beams were reinforced for shear strength by a minimum reinforcement rate. The influence of fiber content added to concrete, at 0.5%, 0.8% and 1.0%, and the possibility of partial or total replacement of conventional shear reinforcement (stirrups) by steel fibers were evaluated. Results showed a significant increase in ductility and stiffness of the beams with steel fibers and, consequently, changes in the failure mode were observed, of shear (control beam) to flexure behavior (beams with steel fibers).Item Acesso aberto (Open Access) Static limit analysis of reinforced soil structures by a simple finite element and second-order cone programming(Associação Brasileira de Ciências Mecânicas, 2017) CAVALCANTE, Eric Luis Barroso; LUCENA NETO, Eliseu; SODRÉ, Denilson José RibeiroTo discretize reinforced soil structures in plane strain and predict their collapse load, a simple three-node triangular finite element is formulated based on the static theorem of the limit analysis. The element satisfies the equilibrium equations and the mechanical boundary conditions in a weak sense. A modified Mohr-Coulomb yield surface is adopted to describe the reinforced soil behavior from a macromechanics point of view. It is also taken into account the possibility of tension failure of the reinforcement and failure of the reinforcement interface. The stated nonlinear convex optimization problem is cast as second-order cone programming. Numerical examples illustrate the predictive accuracy of the above scheme as well as the efficiency and speed of an interior-point method to reach optimal solutions.