This paper proposes damage indices efficient on evaluating the seismic safety of cable-stayed bridges, especially dual-plane, cable-stayed bridges with H-type pylons. The research assumes that the location of accelerometers is already defined as given in the 2017 Ministry of the Interior and Safety (MOIS) guideline. In other words, the paper does not attempt to suggest optimal sensor location for the seismic safety evaluation of cable-stayed bridges. The proposed damage indices are based on those for building structures widely applied in the field already. Those include changes in natural frequencies and changes in relative lateral displacements. In addition, the study proposes other efficient damage indices as the rotation changes at the top of pylons and in the midspan of the girder system. Sensitivity analysis for various damage indices is performed through dynamic analysis using selected earthquake ground motions. The paper compares the effectiveness of the damage indices.

A B S T R A C T
1. 서 론
2. 센서 배치 및 손상 시나리오
    2.1 대상 사장교 개요
    2.2 센서 종류와 배치
    2.3 손상 시나리오
    2.4 지반운동 생성
3. 민감도 분석
    3.1 고유진동수 변화율(DI1)
    3.2 주탑 상대변위 변화율(DI2)
    3.3 주탑 교축방향 회전각 변화율(DI3)
    3.4 중앙경간 바닥판 수직회전각 변화율(DI4)
    3.5 경간중앙 바닥판 상대변위 변화율(DI5)
    3.6 민감도 분석 결과의 요약
4. 결 론
REFERENCES

• 치멧수렝 소롱고(인하대학교 토목공학과) | Chimedsuren Solongo (Department of Civil Engineering, INHA University)
• 안효준(인하대학교 토목공학과) | An Hyo Joon (Department of Civil Engineering, INHA University)
• 신수봉(인하대학교 토목공학과) | Shin Soobong (Department of Civil Engineering, INHA University) Corresponding author