A multi-objective optimal parameter design procedure for slide bridge bearings under seismic excitation based on a deterministic-stochastic modeling approach

X. He, A. Igarashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the process of seismic performance-based design of bridges with slide bearings, there exist intrinsic tradeoffs between minimization of bearing displacement and that of the pier response in selecting bearing parameters for strong earthquake events. However, difficulty in determining the optimal parameters of the bearings that satisfy the two objectives arises, in conjunction with considerable computational resource requirement for nonlinear time-history analysis. In order to find the solutions of the multi-objective optimization problem that reduce the computational cost, a procedure that utilizes the stochastic structural response of equivalent linear systems is proposed. To obtain the performance indices, seismic load is modeled as a stationary random process, whose characteristics are determined for the standard design ground motions specified by the Japanese design code, and the nonlinear behavior of the slide bearings is modeled as equivalent-linear elements using the stochastic linearization technique. As the result, a set of optimal parameter candidates is obtained as the Pareto-front solutions in the multi-objective function space. As the next step, the search of the optimal parameters is conducted by performing nonlinear time-history analysis only for the Pareto-front solution parameter sets to save the computational requirement. As a numerical example, the proposed method is applied to bridges with two types of slide bearings: the uplifting sliding shoe (UPSS) consisting of multiple sliding surfaces, and functionally discrete bearings (FDB) in which friction bearings and elastomeric bearings set in parallel are combined. It is demonstrated that the seismic performance of the bridge for the case of the design parameters obtained by the proposed procedure is almost equivalent to the one with the optimal parameters found by the conventional exhaustive search approach.

Original languageEnglish
Title of host publicationEURODYN 2020 - 11th International Conference on Structural Dynamics, Proceedings
EditorsManolis Papadrakakis, Michalis Fragiadakis, Costas Papadimitriou
PublisherEuropean Association for Structural Dynamics
Pages3643-3654
Number of pages12
ISBN (Electronic)9786188507210
Publication statusPublished - 2020
Externally publishedYes
Event11th International Conference on Structural Dynamics, EURODYN 2020 - Virtual, Athens, Greece
Duration: 2020 Nov 232020 Nov 26

Publication series

NameProceedings of the International Conference on Structural Dynamic , EURODYN
Volume2
ISSN (Print)2311-9020

Conference

Conference11th International Conference on Structural Dynamics, EURODYN 2020
Country/TerritoryGreece
CityVirtual, Athens
Period20/11/2320/11/26

Keywords

  • Multi-objective optimization
  • Seismic excitations
  • Seismic performance assessment
  • Slide bridge bearings
  • Stochastic-deterministic approach

ASJC Scopus subject areas

  • Building and Construction
  • Architecture
  • Civil and Structural Engineering

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