Modelling of vibrations in tunnels using the finite element method with perfectly matched layers

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Lopes, P (Author) Other; Costa, PA (Author) Other; Rui Calçada (Author) FEUP; Cardoso, AS (Author) Other

Journal

Title: Civil-Comp Proceedings

Vol. 98

Pages: 1650-1669

ISSN: 1759-3433

Publisher: Civil-Comp Press

Indexing

Scopus - 0 Citations

Scientific classification

FOS: Engineering and technology > Civil engineering

Other information

Authenticus ID: P-00Q-SDP

DOI: 10.4203/ccp.98.117

Abstract (EN): The simulation and study of problems related with vibrations induced by railway traffic in tunnels is a difficult and complex task. The semi-infinitive character of the domain surrounding the tunnel associated to the three-dimensional characteristics of the problem is one of the major causes of that complexity. An efficient and accurate solution for the simulation of the dynamic behavior of very long structures, i.e. railways, roads or tunnel, is proposed by using 2.5D techniques in the context of the finite elements method, and adopting perfect matched layers (PMLs) for the treatment of the boundaries due to the truncation of the finite elements mesh. Since the resource to 2.5D FEM-PML approach is not very usual, the equations of the 2.5D PML are derived, highlighting the compatibility with the 2.5D FEM. After that brief presentation of the model, a range of validation examples are depicted, showing the accuracy of the model. From the studies here presented it is found that the 2.5 D FEM-PML approach is a reliable method for the study of vibrations induced by traffic. The usage of 2.5D finite elements for the discretization of the cross-section is very suitable for dealing with complex geometries, being the 2.5D PML approach a guarantee of accuracy for the local treatment of the artificial boundaries. ©Civil-Comp Press, 2012

Language: English

Type (Professor's evaluation): Scientific

Notes: http://toc.proceedings.com/14998webtoc.pdf