Earthquakes and Structures

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Behavior of underground strutted retaining structure under seismic condition

  • Chowdhury, Subha Sankar (Department of Civil Engineering, Indian Institute of Technology Kharagpur) ;
  • Deb, Kousik (Department of Civil Engineering, Indian Institute of Technology Kharagpur) ;
  • Sengupta, Aniruddha (Department of Civil Engineering, Indian Institute of Technology Kharagpur)
  • Received : 2014.08.12
  • Accepted : 2014.09.26
  • Published : 2015.05.25
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Abstract

In this paper, the behavior of underground strutted retaining structure under seismic condition in non-liquefiable dry cohesionless soil is analyzed numerically. The numerical model is validated against the published results obtained from a study on embedded cantilever retaining wall under seismic condition. The validated model is used to investigate the difference between the static and seismic response of the structure in terms of four design parameters, e.g., support member or strut force, wall moment, lateral wall deflection and ground surface displacement. It is found that among the different design parameters, the one which is mostly affected by the earthquake force is wall deflection and the least affected is the strut force. To get the best possible results under seismic condition, the embedment depth of the wall and thickness of the wall can be chosen as around 100% and 6% of the depth of final excavation level, respectively. The stiffness of the strut may also be chosen as $5{\times}105kN/m/m$ to achieve best possible performance under seismic condition.

Keywords

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