Non-linear 3D piping analysis under stochastic dynamic loads

Abstract

A new analytical method is presented for non-linear 3D piping systems subjected to stochastic dynamic loadings. First, the paper describes the development of an empirical formulation for the strength and deformation characteristics of piping systems based on a detailed finite-element shell analysis of various pipebends. Five structural parameters are selected to characterize a typical nuclear power piping design in the formulation. Second, the use of a simplified plastic hinge model is proposed in which the non-linear behavior of pipebends under stochastic loadings is accounted for by using an orthotropic biaxial hysteretic model. A numerical example and comparison with other methods are illustrated in terms of computational time and practicality of the method.