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Structural Engineering and Mechanics
  Volume 70, Number 6, June25 2019 , pages 723-735
DOI: https://doi.org/10.12989/sem.2019.70.6.723
 


Experimental and numerical investigation of track-bridge interaction for a long-span bridge
Ji Zhang, Dingjun Wu, Qi Li and Yu Zhang

 
Abstract
    Track-bridge interaction (TBI) problem often arises from the adoption of modern continuously welded rails. Rail expansion devices (REDs) are generally required to release the intensive interaction between long-span bridges and tracks. In their necessity evaluations, the key techniques are the numerical models and methods for obtaining TBI responses. This paper thus aims to propose a preferable model and the associated procedure for TBI analysis to facilitate the designs of long-span bridges as well as the track structures. A novel friction-spring model was first developed to represent the longitudinal resistance features of fasteners with or without vertical wheel loadings, based on resistance experiments for three types of rail fasteners. This model was then utilized in the loading-history-based TBI analysis for an urban rail transit dwarf tower cable-stayed bridge installed with a RED at the middle. The finite element model of the long-span bridge for TBI analysis was established and updated by the bridge\'s measured natural frequencies. The additional rail stresses calculated from the TBI model under train loadings were compared with the measured ones. Overall agreements were observed between the measured and the computed results, showing that the proposed TBI model and analysis procedure can be used in further study.
 
Key Words
    track-bridge interaction; continuously welded rail; fastener resistance; loading-history; rail expansion device; field test; cable-stayed bridge
 
Address
Ji Zhang, Dingjun Wu: School of Civil Engineering, Suzhou University of Science and Technology, 1701 Binhe Road, Suzhou, Jiangsu 215011, China
Department of Bridge Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Qi Li Department of Bridge Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Yu Zhang: Department of Civil & Environmental Engineering, University of California, Los Angeles, CA 90095, USA
 

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