Under sleeper pads in transition zones at railway underpasses: numerical modelling and experimental validation

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Ribeiro, CA (Author) Other; Paixao, A (Author) Other; Fortunato, E (Author) Other; Rui Calçada (Author) FEUP

Journal

Title: Structure and Infrastructure Engineering

Vol. 11

Pages: 1432-1449

ISSN: 1573-2479

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 31 Citations

Other information

Authenticus ID: P-00G-F9K

DOI: 10.1080/15732479.2014.970203

Abstract (EN): In railway lines, transition zones between different track support conditions normally evidence higher degradation rates, thus requiring additional maintenance to ensure safety and service quality. Studies based on numerical simulations indicate that under sleeper pads (USP) can minimise those degradation rates. The study presented herein focuses on the influence of USP on the dynamic behaviour of transitions to underpasses, in an attempt to fill the gap between numerical and field studies. To that aim, the authors used finite element method models, calibrated and validated with field measurements. These models take into account the train-track interaction and include all relevant track components and backfill geomaterials. This study shows that soft USP have a significant influence over the track's dynamic behaviour: amplifying rail displacements and sleeper accelerations, and inducing abrupt variations in the track vertical stiffness and oscillations in train-track forces. To benefit from the use of USP, the authors highlight the need to carefully design stiffness properties of USP and determine their arrangement at transitions. An improved design for the transition zone is proposed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18