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Seismic Risk Assessment of Bridges Using Fragility Analysis

지진취약도분석을 통한 교량의 지진위험도 평가

  • 이진학 (한국과학기술원 스마트사회기반시설연구센터) ;
  • 윤진영 (한국과학기술원 건설및환경공학과) ;
  • 윤정방 (한국과학기술원 건설및환경공학과)
  • Published : 2004.12.01

Abstract

Seismic risk assessment of bridge is presented using fragility curves which represent the probability of damage of a structure virsus the peak ground acceleration. In theseismic fragility analysis, the structural damage is defined using the rotational ductility at the base of the bridge pier, which is obtained through nonlinear dynamic analysis for various input earthquakes. For the assessment of seismic risk of bridge, peak ground accelerations are obatined for various return periods from the seismic hazard map of Korea, which enables to calculate the probability density function of peak ground acceleration. Combining the probability density function of peak ground acceleration and the seismic fragility analysis, seismic risk assessment is performed. In this study, seismic fragility analysis is developed as a function of not the surface motion which the bridge actually suffers, but the rock outcrop motion which the aseismic design code is defined on, so that further analysis for the seismic hazard assessment may become available. Besides, the effects of the friction pot bearings and the friction pendulum bearings on the seismic fragility and risk analysis are examined. Lastly, three regions in Korea are considered and compared in the seismic risk assessment.

Keywords

seismic hazard map;seismic fragility;seismic risk assessment

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