Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Aftershock Fragility Assessment of Damaged RC Bridge Piers Repaired with CFRP Jackets under Successive Seismic Events

CFRP 교각 재킷 보수를 적용한 손상된 철근콘크리트 교량 교각의 여진 취약도 분석

  • Jeon, Jong-Su (Department of Civil Engineering, Andong National University) ;
  • Lee, Do Hyung (Department of Civil, Environmental and Railroad Engineering, Paichai University)
  • 전종수 (안동대학교 토목공학과) ;
  • 이도형 (배재대학교 건설환경.철도공학과)
  • Received : 2018.05.30
  • Accepted : 2018.06.12
  • Published : 2018.07.01
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Abstract

This paper presents a framework for developing aftershock fragility curves for reinforced concrete bridges initially damaged by mainshocks. The presented aftershock fragility is a damage-dependent fragility function, which is conditioned on an initial damage state resulting from mainshocks. The presented framework can capture the cumulative damage of as-built bridges due to mainshock-aftershock sequences as well as the reduced vulnerability of bridges repaired with CFRP pier jackets. To achieve this goal, the numerical model of column jackets is firstly presented and then validated using existing experimental data available in literature. A four-span concrete box-girder bridge is selected as a case study to examine the application of the presented framework. The aftershock fragility curves are derived using response data from back-to-back nonlinear dynamic analyses under mainshock-aftershock sequences. The aftershock fragility curves for as-built bridge columns are firstly compared with different levels of initial damage state, and then the post-repair effect of FRP pier jacket is examined through the comparison of aftershock fragility curves for as-built and repaired piers.

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References

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