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Investigation of Moving Subway Train Vibrational Effect on Surface Structures (Case Study:Tabriz Line 1 Metro)

Tane Gonbadi, Bahram | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44612 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadaghiani, Mohammad Hossein
  7. Abstract:
  8. Ground surface vibration produced by underground running trains is a known impact of rail traffic and has been widely considered in recent years. This vibration can vary in the range of almost 2–200 Hz on the ground surface or in tunnels. In other words, Tunneling in urban areas always has hazards. One of the most important hazards is propagated vibrations due to underground moving trains on surface structures. Purpose of this study is the investigation of moving subway train vibrational effect in line number one of Tabriz metro near station 11. 3D numerical finite element model (ABAQUS) is used in this study. Study of dynamics of a moving train can be considered in three models: longitudinal, lateral and top view. Although it is possible to combine all these models, the resulted model will become verycomplicated. For simulation of train movement, effective factors on dynamic load magnitude and frequency have been studied and variation of wagon force in a longitude model is considered.Then for determining the induced vibrations,Train dynamic load was applied on tunnel numerical model as point load using Fast Fourier Transformation. Maximum displacements in the horizontal and vertical directions beneath the structure are respectively 2.78 and 5.23 mm. For accurate determining of induced ground vibrations, vibration level also computed according to the velocity signal, that by considering later computation, when two trains moving at 80 km/h, pass toward each other, creates a vibration of 83.98 db. This induced vibration level leads to residential annoyance in ground surface. By using silomer elastic layer as underrail damper, these produced vibration can reduce to 61db, wich is noticable amount. Finally, results with variation of geo mechanical properties of soil are checked. Results show that an increase in soil density causes a decrease in amplitude of received vibration to the structure. And an increase in soil Elastic modulus, leads to an increase in the received vibration level to the structure
  9. Keywords:
  10. Numerical Modeling ; Train Dynamic Load ; Tabriz Line 1 Metro ; Surface Structure Vibration

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