Coupled systems mechanics

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Soil -structure interaction analysis of a building frame supported on piled raft

  • Chore, H.S. (Department of Civil Engineering, Datta Meghe College of Engineering) ;
  • Siddiqui, M.J. (Department of Civil Engineering, School of Technology, A.I. Kalsekar Technical Campus)
  • Received : 2015.07.27
  • Accepted : 2016.02.05
  • Published : 2016.03.25
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Abstract

The study deals with physical modeling of a typical building frame resting on pile raft foundation and embedded in cohesive soil mass using finite element based software ETABS. Both- the elements of superstructure and substructure (i.e., foundation) including soil is assumed to remain in elastic state at all the time. The raft is modelled as a thin plate and the pile and soils are treated as interactive springs. Both- the resistance of the piles as well as that of raft base - are incorporated into the model. Interactions between raft-soil-pile are computed. The proposed method makes it possible to solve the problems of uniformly and large non-uniformly arranged piled rafts in a time saving way using finite element based software ETABS. The effect of the various parameters of the pile raft foundation such as thickness of raft and pile diameter is evaluated on the response of superstructure. The response included the displacement at the top of the frame and bending moment in columns. The soil-structure interaction effect is found to increase displacement and increase the absolute maximum positive and negative moments. The effect of the soil- structure interaction is observed to be significant for the type of foundation and soil considered in the present study.

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References

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