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Seismic Fragility Analysis of Rahmen-type Continuous Bridge Supported by High Piers

고교각으로 지지된 라멘형 연속교의 지진취약도 분석

  • 강판승 (충북대학교 방재공학 학과간협동과정) ;
  • 홍기남 (충북대학교 토목공학과) ;
  • 연영모 (충북대학교 토목공학과)
  • Received : 2019.07.05
  • Accepted : 2019.08.19
  • Published : 2019.09.01

Abstract

This paper reports the process of seismic fragility analysis for the rahman-type continuous bridge system. The target structure was the five span highway bridge with maximum pier hight of 72m. OpenSees software was used for the nonlinear time history analysis. In this study, 50 ground motions are considered for nonlinear time history analysis. For each ground motion, PGA was scaled from 0.1g to 2.0g with intervals of 0.1g in order to consider a wide range of the seismic intensity measure. In addition, yield displacement and ultimate displacement of each pier were calculated through section analysis. Based on the result of non linear time history analysis and section analysis, damage condition of target bridge was classified according to the definition of damage condition proposed by Barbat et al. As a result, it was predicted that Extensive Damage occurred at P1 when 0.731 g earthquake occurred in the longitudinal direction. Based on the seismic fragility analysis results, it is found that the probability of occurrence of Extensive Damage in the 4,800 - year period earthquake was about 4.2%. Therefore the target bridge has enough safety for earthquake.

Keywords

Fragility curve;Damage state;OpenSEES;Reinforced concrete bridge

Acknowledgement

Supported by : 행정안전부

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