A Parametric Study on the Comprehensive Analysis of Pipelines under Generalized Actions

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2004

Autores

Rui Carneiro de Barros (Autor) FEUP

Ata de Conferência Internacional

Título: 13th World Conference on Earthquake Engineering

Páginas: 1-13

13th World Conference on Earthquake Engineering

Vancouver, Canada, 1 a 6 de Agosto de 2004

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia civil > Engenharia estrutural

Outras Informações

Abstract (EN): The present work on the seismic analysis of pipelines outlines major aspects of a parametric study of steel pipelines under generalized actions. Design recommendations are synthesized for the seismic design of aboveground and buried pipeline systems. Some relevant parametric results are obtained characterizing the behavior and performance of aboveground and buried pipeline systems under potential seismic actions. For an aboveground pipeline supported by concrete saddles and subjected to seismic actions of two types, a comparative study was performed for a series of critical values of pipeline system responses. The numerical results presented herein were obtained by a spectral analysis with the design spectrum, the time history analyses with eight accelerograms based on the design power spectrum, and by another spectral analysis with the mean response spectrum obtained for the eight accelerograms. Mean spectra are compared with the design spectra, from which it is concluded that the generalized forces obtained with the spectral analysis are similar to the generalized mean forces obtained by time history analysis. Some discrepancies obtained for seismic action of second type were thoroughly justified. For the buried pipeline, the inertia forces resulting from pipeline-soil interaction are much smaller than the forces associated with soil deformation, which leads to a static model for seismic design. A parametric study of the soil-pipeline interaction, for a guillotine-type imposed settlement, considers variability of several pipeline design parameters. It was concluded that the pipeline bending moment is higher for pipeline of larger diameter, due to its higher stiffness. The soil friction angle influence is much smaller than the influence of pipeline diameter, even though relevant. The vertical uplift soil forces are greater for larger diameter pipelines, since they have a better capability to adapt and recover from imposed deformations, resulting in larger lengths of yielded soil around the fault. An increase in the imposed guillotine settlement also increases the pipeline internal generalized forces. For bigger settlements, displacements and forces along the pipeline and soil forces will be also significant in greater extensions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13