Stochastic Newmark schemes for the discretization of hysteretic models

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2010

Autores

Pedro Vieira (Autor) Outra; Paula M. Oliveira (Autor) FEUP; Álvaro Cunha (Autor) FEUP

Ata de Conferência Internacional

Título: 19th International Conference on Computational Statistics

Páginas: 347-347

19th International Conference on Computational Statistics

Paris, France

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

CORDIS: Ciências Físicas > Matemática > Matemática aplicada > Matemática para a engenharia

FOS: Ciências exactas e naturais > Matemática

Outras Informações

Abstract (EN): The need to study and to obtain digital solutions of stochastic nonlinear differential equations is a common situation in Seismic Engineering. This is the case for the hysteretic models. These models do not have an exact solution and can only be approximated by numerical methods. We discretize the solutions using the stochastic improved Euler scheme and the three parameter implicit stochastic Newmark schemes: a higher order and a lower order Newmark scheme. In the case of hysteretic models subjected to gaussian white noises, we were able to reduce the problem of approximating the solution to that of a linear system in each time step avoiding the Newton¿Raphson method in the same time steps. This allowed us to save computational effort in the approximation of the response of the hysteretic system and was achieved by giving explicitly the value of one of the parameters in the equation of the Newmark scheme that corresponds to the hysteretic variable while keeping the equations of the displacement and velocity implicit. We compare the performance of these two implicit Newmark schemes. In the simulation study for the Bouc-Wen model, we compare the solutions produced for the specific choice of the parameters (¿ = 0.5, ß = 0.5) which are the values used by Roy and Dash(2005) in the case of linear systems. We conclude that the standard deviation of the displacement obtained from the proposed higher order Newmark scheme is larger than that obtained from the proposed lower order Newmark scheme. The proposed lower order Newmark scheme is computationally atractive to compete with the improved Euler scheme.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 1