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


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.


seismic hazard map;seismic fragility;seismic risk assessment


  1. Kennedy, R. P. and Ravindra, M. K., Seismic Fragilities for Nuclear Power Plant Risk Studies,' Nuclear Engineering and Design, Vol.79, 1984, pp. 47-68
  2. Dimova, S. and Hirata, K., 'Simplified Seismic Fragility Analysis of Structures with Two Types of Friction Devices,' Earthquake Engineering and Structural Dynamics, Vol.29, 2000, pp. 1153-1175<1153::AID-EQE961>3.0.CO;2-Y
  3. Shinozuka, M., Feng, M. Q., Lee, J., and Naganuma, T., 'Statistical Analysis of Fragility Curves, 'Journal of Engineering Mechanics, Vol. 126, No., 12, 2000, pp. 1224-1231
  4. Shinozuka, M., Hwang, H., and Reich, M., 'Reliability Assessment of Reinforced Concrete Contain-ment Structures, 'Journal of Nuclear Engineering and Design, Vol. 80, 1984, pp. 247-267
  5. 건설교통부, 도로교표준시방서, 한국도로교통협회, 1999
  6. 이진학, 김상훈, 윤정방, Shigeru Kushiyama, '지진취약도 분석을 위한 활률밀도함수 보감 기법', 대한토목학회 논문집, Vol.24, No,2A, 2004, pp. 391-399
  7. 최은수, 최일윤, '매개변수를 고려한 강도로교의 취약도 분석', 한국지진공학회 학술발표회 논문집, Vol. 7, No.2, 2003, pp. 334-340
  8. Karim, K. R. and Yamazaki, F., 'Effect of Earthquake Ground Motions on Fragility Curves of Highway Bridge Piers based on Numerical Simulation,' Earthquake Engineering andStructural Dynamics, Vol. 30,2001, pp. 1839-1856
  9. Choi, E., DesRoches, R. and Nielson, B., 'Seismic Fragility of Typical Bridges in Moderate Seismic Zones,' Engineering Structures, Vol. 26, No.2, 2004, pp. 187-199
  10. Park, Y.J., and Ang, A.H-S. 'Mechanistic seismic damage model for reinforced concrete,' Journal of Structural Engineering, Proceedings of ASCE, Vol. 111,1985, pp. 722-739
  11. Kim, S. H. and Shinozuka, M., 'Development of Bridges Retrofitted by Column Jacketing,' Probabilistic Engineering Mechanics, Vol.19, No.1, 2004, pp. 105-112
  12. 건설교통부, 내진설계기준연구(II): 내진설계성능기준과 경제성평가, 1997
  13. HAZUS., Earthquake Loss Estimation Methodology, Technical Manual, National Institute of Building for the Federal Emergency Management Agency, Washington (DC), 1997
  14. Gasparini, D., and Vanmarcke, E.H., 'Simulated earthquake motions compatible with prescribed response spectra,' Dept. of Civil Engineering, Massachusetts Inst. of Technology, Cambridge, 1976
  15. Idriss, I. M. and Sun, J. I., User's Manual for SHAKE91, Center for Geotechnical Modeling, Department of Civil and Environmental Engineering, University of California, 1992
  16. Scott, B. D., Park, R., and Priestley, M. J. N , 'Stress-Strain Behavoir of Concrete Confined by Overlapping Hoops at Low and High Strain Rates,' ACI, Vol. 79, No. 1, 1982, pp. 13-27
  17. Mattock, A. H., Discussion of 'Rotational Capacity of Reinforced Concrete Beams,' by W. G. Corley, Journal of Structural Division, ASCE, Vol.93, ST2, 1967, pp. 519-522
  18. 김영석, 임종성, 윤정방, 김두훈, 'PTFE 활동판-고무링 지진 격리받침이 설치된 교량의 진동대 실험 및 단순해석법', 대한토목학회 논문집, Vol. 19, No. 1-6, 1999, pp. 899- 906
  19. Kim, Y. S., 'Experimental Study of the Friction Pendulum System in Bridge Seismic Isolation,' Master Dissertation, Department of Civil, Stru-ctural and Environmental Engineering, State University of New York, Buffalo (NY), 1993
  20. Constantinou, M. C., Mokha, A, and Reinhorn, A.M., 'Teflon Bearings in Base Isolation II: Modeling,' Journal of Structural Engineering, ASCE, Vol.l16, No. 2, 1990, pp. 455-474

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