Structural Engineering and Mechanics

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Experimental and numerical investigation of track-bridge interaction for a long-span bridge

  • Zhang, Ji (School of Civil Engineering, Suzhou University of Science and Technology) ;
  • Wu, Dingjun (Department of Bridge Engineering, Tongji University) ;
  • Li, Qi (Department of Bridge Engineering, Tongji University) ;
  • Zhang, Yu (Department of Civil & Environmental Engineering, University of California)
  • Received : 2018.06.11
  • Accepted : 2019.03.19
  • Published : 2019.06.25
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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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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