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Different approaches for numerical modeling of seismic soil-structure interaction: impacts on the seismic response of a simplified reinforced concrete integral bridge

  • Dhar, Sreya (Department of Civil Engineering, Indian Institute of Technology) ;
  • Ozcebe, Ali Guney (Department of Civil and Environmental Engineering, Politecnico di Milano) ;
  • Dasgupta, Kaustubh (Department of Civil Engineering, Indian Institute of Technology) ;
  • Petrini, Lorenza (Department of Civil and Environmental Engineering, Politecnico di Milano) ;
  • Paolucci, Roberto (Department of Civil and Environmental Engineering, Politecnico di Milano)
  • Received : 2019.05.28
  • Accepted : 2019.08.21
  • Published : 2019.10.25
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Abstract

In this article, different frequently adopted modeling aspects of linear and nonlinear dynamic soil-structure interaction (SSI) are studied on a pile-supported integral abutment bridge structure using the open-source platform OpenSees (McKenna et al. 2000, Mazzoni et al. 2007, McKenna and Fenves 2008) for a 2D domain. Analyzed approaches are as follows: (i) free field input at the base of fixed base bridge; (ii) SSI input at the base of fixed base bridge; (iii) SSI model with two dimensional quadrilateral soil elements interacting with bridge and incident input motion propagating upwards at model bottom boundary (with and without considering the effect of abutment backfill response); (iv) simplified SSI model by idealizing the interaction between structural and soil elements through nonlinear springs (with and without considering the effect of abutment backfill response). Salient conclusions of this paper include: (i) free-field motions may differ significantly from those computed at the base of the bridge foundations, thus put a significant bias on the inertial component of SSI; (ii) conventional modeling of SSI through series of soil springs and dashpot system seems to stay on the safer side under dynamic conditions when one considers the seismic actions on the structure by considering a fully coupled SSI model; (iii) consideration of abutment-backfill in the SSI model positively affects the general response of the bridge, as a result of large passive resistance that may develop behind the abutments.

Keywords

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