Expansion of the lumped parameter method to nonlinear, soil-structure interacting dynamic systems by means of a multi-objective optimization algorithm

N. Lesgidis, A. Sextos, Oh Sung Kwon

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

The computational demand of the soil-structure interaction (SSI) analysis for the design and assessment of structures as well as for the evaluation of life cycle cost and risk exposure has led the civil engineering community to the development of a variety of methods towards the model order reduction of the coupled soil-structure dynamic system. Different approaches have been proposed in the past as computationally efficient alternatives to the conventional FEM simulation of the complete structure-soil domain, such as the nonlinear lumped spring, the macroelement method and the substructure partition method. Yet, with few exceptions, no approach was capable of capturing simultaneously the frequency-dependent dynamic properties along with the nonlinear behavior of the condensed segment of the overall soil-structure system, thus generating an imbalance between the modeling refinement achieved for the soil and the structure. To this end, a dual frequency- and intensity-dependent expansion of the Lumped Parameter Modeling method is proposed in the current paper, materialized through a multi-objective algorithm, capable of closely approximating the behavior of the nonlinear dynamic system of the condensed segment. The efficiency of the proposed approach is validated for the case of an existing bridge, wherein the seismic response is comparatively assessed for both the proposed method and the detailed finite element model. The above expansion is deemed a computational efficient and reliable approach for simultaneously considering the frequency and amplitude dependence of soil-foundation-superstructure effects in the framework of nonlinear response history analysis.

Original languageEnglish
Title of host publicationCOMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
PublisherNational Technical University of Athens
Pages1216-1230
Number of pages15
Volume1
ISBN (Electronic)9786188284418
DOIs
Publication statusPublished - 1 Jan 2017
Event6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering - Rodos Palace's Convention Center, Rhodes Island, Greece
Duration: 15 Jun 201717 Jun 2017
Conference number: 6
https://2017.compdyn.org/

Conference

Conference6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Abbreviated titleCOMPDYN 2017
CountryGreece
CityRhodes Island
Period15/06/1717/06/17
OtherCOMPDYN 2017 is one of the Thematic Conferences of the European Community on Computational Methods in Applied Sciences (ECCOMAS) and a Special Interest Conference of the International Association for Computational Mechanics (IACM). It has also been promoted by the European Committee on Computational Solids and Structural Mechanics (ECCSM) of ECCOMAS.
Internet address

Keywords

  • Lumped parameter modeling
  • Model order reduction
  • Soil-structure interaction

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