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Verification of Linear FE Model for Nonlinear SSI Analysis by Boundary Reaction Method

경계반력법에 의한 비선형 SSI 해석을 위한 선형 FE 해석모델 검증

  • Lee, Gye Hee (Dept. of Ocean & Plant Construction Engineering, Mokpo National Maritime University) ;
  • Hong, Kwan Young (Dept. of Ocean & Plant Construction Engineering, Mokpo National Maritime University) ;
  • Lee, Eun Haeng (Department of Marine and Civil Engineering, Chonnam National Univ.) ;
  • Kim, Jae Min (Department of Marine and Civil Engineering, Chonnam National Univ.)
  • 이계희 (목포해양대학교 해양.플랜트건설공학과) ;
  • 홍관영 (목포해양대학교 해양.플랜트건설공학과) ;
  • 이은행 (전남대학교 해양토목공학과) ;
  • 김재민 (전남대학교 해양토목공학과)
  • Received : 2014.02.11
  • Accepted : 2014.03.19
  • Published : 2014.04.30

Abstract

In this paper, a coupling scheme for applying finite element analysis(FEA) programs, such as, LS-DYNA and MIDAS/Civil, to a nonlinear soil structure interaction analysis by the boundary reaction method(BRM) is presented. With the FEA programs, the structure and soil media are discretized by linear or nonlinear finite elements. To absorb the outgoing elastic waves to unbounded soil region as much as possible, the PML elements and viscous-spring elements are used at the outer FE boundary, in the LS-DYNA model and in MIDAS/Civil model, respectively. It is also assumed that all the nonlinear elements in the problem are limited to structural region. In this study, the boundary reaction forces for the use in the BRM are calculated using the KIESSI-3D program by solving soil-foundation interaction problem subjected to incident seismic waves. The effectiveness of the proposed approach is demonstrated with a linear SSI seismic analysis problem by comparing the BRM solution with the conventional SSI solution. Numerical comparison indicates that the BRM can effectively be applied to a nonlinear soil-structure analysis if motions at the foundation obtained by the BRM for a linear SSI problem excluding the nonlinear structure is conservative.

Keywords

boundary reaction method;nonlinear soil-structure interaction;perfectly matched layer;LS-DYNA;viscous boundary;MIDAS/Civil

Acknowledgement

Supported by : 지식경제부

References

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