Bending of stochastic Kirchhoff plates on Winkler foundations via the Galerkin method and the Askey-Wiener scheme

Autor(es)

da Silva, Jr., Claudio R. Avila ^[1] ; Beck, Andre Teofilo ^[2]

Afiliação do(s) autor(es)

^[1] Univ Tecnol Fed Parana, BR-3165 Curitiba, PR - Brazil

^[2] Univ Sao Paulo, Dept Struct Engn, EESC, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PROBABILISTIC ENGINEERING MECHANICS; v. 25, n. 2, p. 172-182, APR 2010.
• Citações Web of Science: 7

Resumo

In this paper, the method of Galerkin and the Askey-Wiener scheme are used to obtain approximate solutions to the stochastic displacement response of Kirchhoff plates with uncertain parameters. Theoretical and numerical results are presented. The Lax-Milgram lemma is used to express the conditions for existence and uniqueness of the solution. Uncertainties in plate and foundation stiffness are modeled by respecting these conditions, hence using Legendre polynomials indexed in uniform random variables. The space of approximate solutions is built using results of density between the space of continuous functions and Sobolev spaces. Approximate Galerkin solutions are compared with results of Monte Carlo simulation, in terms of first and second order moments and in terms of histograms of the displacement response. Numerical results for two example problems show very fast convergence to the exact solution, at excellent accuracies. The Askey-Wiener Galerkin scheme developed herein is able to reproduce the histogram of the displacement response. The scheme is shown to be a theoretically sound and efficient method for the solution of stochastic problems in engineering. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/10366-4 - Claudio Roberto Ávila da Silva Junior | Universidade Tecnológica Federal do Paraná - campus Curitiba - Brasil
• Beneficiário: André Teófilo Beck
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Brasil