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


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.


Fragility curve;Damage state;OpenSEES;Reinforced concrete bridge


Supported by : 행정안전부


  1. Baker, J. W. (2015), Code supplement to "Efficient analytical fragility function fitting using dynamic structural analysis"
  2. Barbat, A. H., Pujades, L. G., and Lantada, N. (2008), Seismic damage evaluation in urban areas using the capacity spectrum method, Soil Dynamics and Earthquake Engineering, 28(10-11), 851-865.
  3. Daniell, J. E., Khazai, B., Senzel, F., and Vervaeck, A. (2011), The CATDAT damging earthquakes database, Natural Hazards and Earth System Sciences, 11, 2235-2251.
  4. Faccioli, E,, Pessina, V., Calvi, G. M., and Borzi, B. (1999), A study on damage scenarios for residential buildings in Catania city, Journal of Seismology, 3(3), 327-343.
  5. Huh, M. Y. (2010), The analysis of major earthquake in korea and compartmentalization, Master's Thesis, Korea National University of Education.
  6. Hwang H., Huo J. R. (1998), Probabilistic Seismic Damage Assessment of Highway Bridges, the 6th U.S. National Conference on Earthquake Engineering, Seattle, WA.
  7. Jeong, H. C., and Kim, I, H. (2009), Characteristics of Stress-strain Relationship of Concrete Confined by Lateral Reinforcement, Journal of the Earthquake Engineering Society of Korea, 13(3), 67-80.
  8. Kennedy R. P., Ravindra M. K. (1984), Seismic Fragilities for Nuclear Power Plant, Journal of Nuclear Engineering and Design, 79(1), 47-68.
  9. Kim, H. S., and Song, J. K. (2010), Effect of Near and Far-Fault Earthquakes for Seismic Fragility Curves of PSC Box Girder Bridges, Journal of the Earthquake Engineering Society of Korea, 14(5), 53-64.
  10. Kim, J. C., Byeon, J. S., and Shin, S. B.(2006), Seismic Fragility Analysis of a FCM Bridge Considering Soil Properties, Journal of the Earthquake Engineering Society of Korea, 12(3), 37-44.
  11. Kwon, O. S., Elnashai, A. (2006), The effect of material and ground motion uncertainty on the seismic vulnerability curves of RC structure, Journal of Engineering Structures, 28(2), 289-303.
  12. Lee, D. H., Chung, Y. S., and Yang, D. W. (2009), Fragility Analysis Method Based on Seismic Performance of Bridge Structure considering Earthquake Frequencies, Journal of the Korea Concrete Institute, 21(2), 187-197.
  13. Mander, J. B., Priestley, M. J. N., and Park, R. (1988), Theoretical Stress-Strain Model for Confined Concrete, Journal of Structural Engineering, 114(8).
  14. Menegotto, M., Pinto, P. E. (1973), Method of Analysis for Cyclic Loaded R. C. Plane Frame Including Changes in Geometry and Non-Elastic Behaviour of Elements under Combined Normal Force and Bending, IABSE Symposium on the Resistance and Ultimate Deformability of Structures Acted on by Well Defined Repeated Loads, Preliminary Report, 11, 15-22.
  15. MOLIT. (2015), Seismic Performance of Existing Facilities (Bridges)
  16. Nam, W. H. (2006), A study on Improvement of Seismic Performance Evaluation Procedures for Multi-Span Bridges, Ph.D. Dissertation, Kangwon National University.
  17. Nam, W. S. (2014), Assessment of earthquake vulnerability in underground area in urban area, Master's Thesis, University of Seoul.
  18. Nguyen, D.D., and Lee. T. H. (2018), Seismic fragility curves of bridge piers accounting for ground motions in Korea, IOP Conference Series: Earth and Environmental Science, 143(1), 1-10.
  19. OpenSEES. (2006), .
  20. Park, H. R., and Ahn, J. K. (2017), A Study on the Establishment of Earthquake Safety Guidance Model for Disaster Prevention Policy in Korea, Journal of Cadastre & Land Informati, 47(1), 251-265.
  21. Priestley, M. J. N., Seible, F., Calvi, G. M., (1996), Seismic Design and Retrofit of Bridges, Jonh wiley & Sons, INC, New-York.
  22. Seo, H. Y., Yi, J. H., Kim, D. K., and Song, J. K. (2010), Modified HAZUS Method for Seismic Fragility Assessment od Domestic PSC-I Girder Bridges, Journal of the Korea institute for structural maintenance and inspection, 14(2), 161-170.
  23. Shinozuka, M., Feng, M. Q., Kim H. J., and Naganuma, T. (2000), Statistical Analysis of Fragility Curves, Journal of Engineering Mechanics, 126(12), 1224-1231.
  24. Spacone, E., Filippou, F. C., and Taucer, F. F. (1996), Fibre Beam-Column Model for Nonlinear Analysis of R/C Frames: Part I, Earthquake Engneering Structural Dynamics, 25(7), 711-725.<711::AID-EQE576>3.0.CO;2-9
  25. Sun, C. H., Lee, J. S., and Kim, I. H.(2010), Seismic Vulnerabilities of a Multi-Span Continuous Bridge Considering the Nonlinearity of the Soil, Journal of the Earthquake Engineering Society of Korea, 14(3), 59-68.
  26. U.S NRC. (1978), Development of Floor Design Response Spectra for Seismic Design of Floor Supported Equipment or Components, Regulatory Guide 1.122, Rev. 1.
  27. Yi, J. H., Kim, S. H., Yun, C. B., and Shigeru, K. (2004), PDF Interpolation Technique for Seismic Fragility Analysis, Korean Society of Civil Engineering, 24(2A), 391-399.