Geometric Imperfections
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Clarifying the theoretical basis of the global geometric imperfection analysis (out-of-plumb columns)
Abstract The concrete structures present several geometric deviations, some of them considered indirectly in the safety factors of the design. However, the imperfections of the element axes, especially columns, should be explicitly considered in the structural analysis because they have great influence over the building stability. The NBR 6118:2014, Brazilia
REM, Int. Eng. J.. Publicado em: 2021-06
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2. On the use of parameter γ z in fire situation
Resumo A seguir será apresentado um estudo sobre o uso do parâmetro γz em pórticos de concreto armado em situação de incêndio. Atualmente, não se têm resultados de investigação similar em estruturas de concreto, já que o tema não tem recebido atenção adequada. Em situação de incêndio muitas das ações horizontais deixam de ser consideradas
Rev. IBRACON Estrut. Mater.. Publicado em: 13/12/2019
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3. Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers
Abstract This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh’s method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considere
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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4. Inelastic second-order analysis of steel columns under minor-axis bending
Abstract The inelastic second-order behavior of steel structural columns under minor-axis bending is presented in this article. To study this behavior, a nonlinear frame element formulation is adopted in which the steel's plasticity process is accompanied at the nodal points of each finite element through the refined plastic-hinge method (RPHM). A tangent mo
REM, Int. Eng. J.. Publicado em: 19/06/2019
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5. Local buckling and post-critical behavior of thin-walled composite channel section columns
Abstract This work presents a study of the behavior, performance and failure of thin-walled composite channel section columns. The study is carried-out using nonlinear finite element models of laminated columns, including geometric imperfections and material failure, as well as approximate analytical solutions based on the Classical Lamination Theory. The ac
Lat. Am. j. solids struct.. Publicado em: 19/07/2018
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6. Energy based collocation method to predict progressive damage behavior of imperfect composite plates under compression
Abstract A new collocation methodology is presented to predict failure and progressive damage behavior of composite plates in this paper. The present work deals with composite plates containing initial geometric imperfections and different boundary conditions under uniaxial in-plane compressive load. In the present study, the domain is discretized with Lege
Lat. Am. j. solids struct.. Publicado em: 04/06/2018
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7. Numerical analysis of cold-formed double angles back-to-back under compression
Abstract Here-in, a numerical analysis based on the Finite Element Method (FEM) is proposed in order to investigate cold-formed steel back-to-back double angle structural behavior under compression. Considering non-linear analysis, an investigation was performed to analyze the influence of some aspects, such as the loading condition (concentric and eccentric
REM, Int. Eng. J.. Publicado em: 2017-12
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8. Análise de alguns aspectos no estudo de torres estaiadas / Analysis of different aspects to be taken into account in the study of guyed masts
As de torres treliçadas estaiadas são muito utilizadas e são foco de atenção na pesquisa da engenharia moderna, apresentando-se como um desafio na avaliação das excitações que sobre elas atuam, assim como a determinação das respostas dos elementos que as compõem. Para realizar um estudo neste sentido se realiza no presente trabalho a avaliação
Publicado em: 2011
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9. As ligações semirrígidas na análise avançada com zona plástica de portais planos de aço
In this work, the development of the Plastic-Zones Advanced Analysis of plane steel portals is studied, now including the connections effect. Firstly, this analysis is defined as inelastic second-order which capture the plasticity spread by slice technique and includes the Main Aspects as geometric (out-of-straight and out-of-plumb) and physical imperfection
Publicado em: 2010
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10. Mode localization of modular prestressed plate panels. / Localização de modos de vibração em painéis modulados de lajes protendidas.
In this research, the phenomenon of vibration modes localization in nearly periodic modular structures of linear and nonlinear behavior is studied. Of special interest is an application in Civil Engineering, lightly coupled periodic plate panels with small imperfections, mainly submitted to the variation of membrane forces introduced by prestress forces, whi
Publicado em: 2009
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11. Sobre a estabilidade de cantoneiras de aço formadas a frio submetidas à compressão / On the stability of cold-formed steel angles under compression
Apparently, the structural analysis of a simple angle under compression is an elementary problem, therefore, already largely known. However, cold-formed steel angles, mostly with slender legs, present two critical buckling modes: (i) global-flexural mode, in cases of high length members, (ii) and a coincident local-plate/global-torsional-flexural mode, which
Publicado em: 2008
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12. Prebuckling enhancement of beams and plates under uncertain loadings and arbitrary initial imperfections
Crooked beams and plates with arbitrary initial geometric imperfections are optimized in order to improve their prebuckling response in the presence of uncertain loadings. A novel optimization approach is presented to simultaneously handle the two types of uncertainties: arbitrary initial imperfection patterns and arbitrary loadings. A remarkable improvement
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-12