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 boxgirder 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.

A B S T R A C T
 1. 서 론
 2. 초기 손상에 의존한 여진 취약도 함수 모델링
 3. 교각 보수 해석모델 검증
 4. 여진 취약도 함수 방법론의 적용
  4.1 해석대상 교량
  4.2 교량의 해석모델
  4.3 손상상태 결정
  4.4 지진파 셋 및 초기 손상에 따른 본진-여진 연속지진 동적해석
 5. 해석대상 교량의 여진 취약도 곡선 분석
  5.1 초기손상상태에 따른 취약도 비교
  5.2 FRP 교각 재킷의 보수효과
 6. 결 론
 REFERENCES

• 전종수(안동대학교 토목공학과) | Jeon, Jong-Su
• 이도형(배재대학교 건설환경･철도공학과) | Lee, Do Hyung Corresponding author