EM - Escola de Minas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6
Notícias
A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.
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Resultados da Pesquisa
Item Comparison between exact and approximate methods for geometrically nonlinear analysis prescribed in design standards for steel and reinforced concrete structures.(2022) Lecchia, Laís de Bortoli; Ferreira, Walnório Graça; Costa, Paulo Manuel Mendes Pinheiro da Providência e; Sarmanho, Arlene Maria CunhaCurrent practices in structural engineering demand ever-increasing knowledge and expertise concerning stability of structures from professionals in this field. This paper implements standardized procedures for geometrically nonlinear analysis of steel and reinforced concrete structures, with the objective of comparing methodologies with one another and with a geometrically exact finite element analysis performed with Ansys 14.0. The following methods are presented in this research: Load Amplification Method, from NBR 8800:2008; the z γ coefficient method, from NBR 6118:2014; the P-Delta iterative method and the αcr coefficient method, prescribed in EN 1993-1-1:2005. A bibliographic review focused on standardized approximate methods and models for consideration of material and geometric nonlinearities is presented. Numerical examples are included, from which information is gathered to ensure a valid comparison between methodologies. In summary, the presented methods show a good correlation of results when applied within their respective recommended applicability limits, of which, Eurocode 3 seems to present the major applicability range. The treated approximate methods show to be more suitable for regular framed structures subjected to regular load distributions.Item O número complexo e seu uso na engenharia civil.(2009) Ferreira, Walnório Graça; Camargo, Rodrigo Silveira; Frasson, Antônio Manoel Ferreira; Mansur, Webe João; Silveira, Ricardo Azoubel da MotaO presente artigo tem o objetivo de propor aos professores dos cursos de engenharia civil e mecânica a apresentação pedagógica de números complexos aos seus alunos. Inicia-se com a história do número complexo, a origem da equação de Euler, e resolve-se a equação de movimento de um sistema massa-mola com um grau de liberdade, dotado de amortecimento viscoso, utilizando-se números complexos. Isso facilita a solução da equação de movimento, pois a equação diferencial se transforma numa equação algébrica. É uma abordagem didática, que visa despertar o interesse dos alunos de engenharia civil e mecânica pelos números complexos. Finalmente, aplica-se a presente formulação a um caso prático da engenharia estrutural.Item Time segmented frequency domain analysis for non linear multi degree of freedom structural systems.(2000) Mansur, Webe João; Carrer, José Antonio Marques; Ferreira, Walnório Graça; Gouveia, Antônio Maria Claret de; Venâncio Filho, FernandoThis paper presents a new frequency-domain method to analyze physically non-linear structural systems having non-proportional damping. Single- and multi-degree-of-freedom (d.o.f.) systems subjected to time-dependent excitations are considered. A procedure to consider initial conditions, required by the methodology described, is discussed. The algorithm described here employs a time-segmented procedure in modal co-ordinates in the frequency domain; solution in each time-segment being obtained by an iterative process. The proposed methodology is validated by three examples. The procedure presented here can be employed as well to analyze structural systems with viscous and hysteretic damping or else with frequency-dependent damping properties.