Material Nonlinearity
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. Failure behavior modeling of slender reinforced concrete columns subjected to eccentric load
AbstractThis work presents a numerical model to simulate the failure behavior of slender reinforced concrete columns subjected to eccentric compression loads. Due to the significant influence of the lateral displacements on the loading state provided by an eccentric load, geometric nonlinearity is considered. The responses of the concrete in tension and comp
Lat. Am. j. solids struct.. Publicado em: 2015-03
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14. Modified couple stress-based third-order theory for nonlinear analysis of functionally graded beams
A microstructure-dependent nonlinear third-order beam theory which accounts for through-thickness power-law variation of a two-constituent material is developed using Hamilton's principle. The formulation is based on a modified couple stress theory, power-law variation of the material, and the von Kármán nonlinear strains. The modified couple stress theory
Lat. Am. j. solids struct.. Publicado em: 2014-05
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15. Finite element implementation for the analysis of 3D steel and composite frames subjected to fire
This paper presents a finite element formulation for the numerical analysis of three-dimensional framed steel, reinforced concrete or composite steel and concrete structures subjected to fire. Several specialized and commercial programs may be used for the analysis of structures in fire condition. Within this context, the purpose of this work is to present t
Lat. Am. j. solids struct.. Publicado em: 2014-01
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16. Material and geometric nonlinear analysis of reinforced concrete frame structures considering the influence of shear strength complementary mechanisms
A mechanical model for the analysis of reinforced concrete frame structures based on the Finite Element Method (FEM) is proposed in this paper. The nonlinear behavior of the steel and concrete is modeled by plasticity and damage models, respectively. In addition, geometric nonlinearity is considered by an updated lagrangian description, which allows writing
Lat. Am. j. solids struct.. Publicado em: 2013-09
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17. Resistência de um solo não saturado a partir de ensaios com teor de umidade constante (CW) / Shear strength of an unsaturated soil from constant water content tests
In many parts of the world, geotechnical engineers frequently deal with unsaturated soils, and the performance of constructions on such soils depends on their mechanical characteristics, and among them, the shear strength. The unsaturated soil shear strength can be experimentally determined by using techniques which allow soil suction control or measurement
Publicado em: 2010
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18. Propagação não linear de pulsos em estruturas 1D com band gap fotonico / Nonlinear pulse propagation in one-dimensional photonic band gap structures
The interaction of ultrashort optical pulses with photonic band gap materials has been studied by considering light propagation through one-dimensional photonic band gap structures, composed of a periodic multilayer stack of dielectric materials whose unitary cell consists of a pair of layers with different refractive indices n1and n2, respectively. One of t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2009
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19. Boundary element method formulation for reinforced plates with combined geometrical and material nonlinearities / Formulação do método dos elementos de contorno para placas enrijecidas considerando-se não-linearidades física e geométrica
Este trabalho tem como objetivo principal apresentar formulações do método dos elementos de contorno que contemplem as análises de placas considerando-se as não-linearidades física e geométrica e de placas enrijecidas considerando-se o comportamento não-linear físico do material. As equações integrais utilizadas são baseadas na teoria de Kirchhof
Publicado em: 2008
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20. Estudo de nós soldados tipo K de treliças planas constituídas por seções tubulares circulares de aço
The trusses of circular hollow sections, should be checked about last limit states of plastification and punching shear of chord wall. The standards AWS D1.1: 2002, ANSI /IACS 360-05 and EN 1993-1-8:2005 have virtually identical procedures for the verification of these limits states, based mainly in the works of Wardenier et al. (1991) and Packer and Henders
Publicado em: 2008
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21. Implementation of Z-Scan technique with white light continuum generated in a photonic crystal fiber for nonlinear spectrum determination / Implementação da técnica de varredura-Z com luz branca supercontínua gerada em fibras fotônicas na determinação do espectro de não linearidades
In this dissertation, we proposed a method that combines the Z-scan technique and the white-light continuum generated by a photonic crystal fiber to characterize the nonlinear spectrum of materials. The nonlinear spectrum provides crucial information on the characteristic, the origin and the potential of the nonlinearity for devices application. In this sens
Publicado em: 2008
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22. Análise Não-Linear de Pórticos Tridimensionais Formados por Elementos Mistos de Aço e Concreto
The purpose of this dissertation is the development, implementation and test of numerical models for the Finite Element simulation of plain steel, reinforced concrete and composite steel-concrete three-dimensional frames. Physical (material) and geometrical nonlinearities are taken into account in the Finite Element formulation. At the cross section level, a
Publicado em: 2007
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23. Analise numerica não-linear de estruturas de concreto armado considerando o fenomeno da aderencia entre o aço e o concreto / Non-linear numerical analysis of reinforced concrete structures considering the bond phenomena between the steel and the concrete
In this work aspects of the properties of the concrete, steel and the interaction between them, with particular interest in the deterioration of the bond that occurs in the steel-concrete interface that are necessary to the numerical analysis of reinforced concrete structures are studied. The main aim of this research is the development of a numerical model
Publicado em: 2007
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24. Non-linear numerical analysis of reinforced concrete structures considering the bond phenomena between the steel and the concrete / Analise numerica não-linear de estruturas de concreto armado considerando o fenomeno da aderencia entre o aço e o concreto
Neste trabalho são estudados os aspectos das propriedades do concreto, das propriedades do aço e das interações entre eles, com particular interesse na deterioração da aderência que ocorre na interface aço-concreto, para a análise numérica de estruturas de concreto armado. O objetivo principal é o desenvolvimento de uma modelagem numérica capaz d
Publicado em: 2007