Structural Engineering and Mechanics

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Performance of under foundation shock mat in reduction of railway-induced vibrations

  • Sadeghi, Javad (School of Railway Engineering, Iran University of Science and Technology) ;
  • Haghighi, Ehsan (School of Railway Engineering, Iran University of Science and Technology) ;
  • Esmaeili, Morteza (School of Railway Engineering, Iran University of Science and Technology)
  • Received : 2019.09.03
  • Accepted : 2021.04.06
  • Published : 2021.05.25
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Abstract

Under foundation shock mats have been used in the current practice in order to reduce/damp vibrations received by buildings through the surrounding environment. Although some investigations have been made on under foundation shock mats performance, their effectiveness in the reduction of railway induced-vibrations has not been fully studied, particularly with the consideration of underneath soil media. In this regard, this research is aimed at investigating performance of shock mat used beneath building foundation for reduction of railway induced-vibrations, taking into account soil-structure interaction. For this purpose, a 2D finite/infinite element model of a building and its surrounding soil media was developed. It includes an elastic soil media, a railway embankment, a shock mat, and the building. The model results were validated using an analytical solution reported in the literature. The performance of shock mats was examined by an extensive parametric analysis on the soil type, bedding modulus of shock mat and dominant excitation frequency. The results obtained indicated that although the shock mat can substantially reduce the building vibrations, its performance is significantly influenced by its underneath soil media. The softer the soil, the lower the shock mat efficiency. Also, as the train excitation frequency increases, a better performance of shock-mats is observed. A simplified model/method was developed for prediction of shock mat effectiveness in reduction of railway-induced vibrations, making use of the results obtained.

Keywords

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