Journal of Korean Association for Spatial Structures (한국공간구조학회논문집)

Korean Association for Spatial Structures (한국공간구조학회)
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Study on the Joint Stiffness, Natural Frequency and Damping Ratio of Stone Pagodas in Korea

국내 석탑의 강성, 고유진동수 및 감쇠비에 관한 연구

  • Lee, Sung-Min (Korea Construction Quality Research Center(KCQR)) ;
  • Choi, Hee-Soo (Top Cultural Heritage Tech.) ;
  • Lee, Ki-Hak (Architectural Engineering, Sejong University) ;
  • Lee, Chan-Hee (Dept. of Cultural Heritage Conservation Science, Kongju National University) ;
  • Jo, Young-Hoon (Dept. of Cultural Heritage Conservation Science, Kongju National University)
  • 이성민 ((재)한국건설품질연구원) ;
  • 최희수 (탑문화재기술) ;
  • 이기학 (세종대학교 건축공학부) ;
  • 이찬희 (공주대학교 문화재보존과학과) ;
  • 조영훈 (공주대학교 문화재보존과학과)
  • Received : 2017.10.21
  • Accepted : 2017.11.13
  • Published : 2018.03.15
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Abstract

Following the earthquake that shook the city of Gyeongju, Korea, in 2016, it became apparent that research on the safety of cultural heritages against the seismic hazards is necessary in Korea. Predictions of how historically significant stone pagodas would behave the earthquakes anticipated in near future, which are the subject of this study, is also required. In this study, the dynamic characteristics of 15 cultural heritage designated stone pagodas of Korea were investigated, including natural frequency and damping ratio, and the stiffness of the stone material and its contact area were determined using eigenvalue analysis by assuming the stone pagodas to be multi-degree-of-freedom structures. The results of this study enable the structural modeling of stone pagodas using a finite element analysis program and the method is expected to be useful in assessing the structural safety of stone pagodas against vertical loads as well as lateral forces, including earthquakes. Also, by identifying the dynamic characteristics of the structures, the results of this study can be utilized as a nondestructive testing method to determine the rigidity of cultural heritage structures and to identify inherent problems. The natural frequencies of the Korean stone pagodas were measured to be within 3.5~8.3Hz, excluding cases with distinct natural frequency results, and it was determined that the natural frequencies of the stone pagodas are influenced by various parameters including the height and joint stiffness of the structures.

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References

  1. Lee, S. M., Shon, H. W., & Lee, S. G., "Dynamic Characteristics and Compressive Stress of Multi-Layered Stone Masonry Model", Journal of the Korean Geophysical Society, Vol.7, No.1, pp.31-40, 2004
  2. Lee, S. M., "Dynamic Characteristics of Traditional Stone Masonry Structures in Korea", Ph.D. Dissertation, Department of Architectural Engineering, Chonnam National University, pp.140, 2002
  3. Lee, S. M., Shon, H. W., & Lee, S. G., "Stiffness and Natural Frequency of Stone Masonry Pagoda", Journal of the Korea Institute for Structural Maintenance and Inspection, Vol.8, No.3, pp.263-270, 2004
  4. Lee, S. M., Lee, K. H., Park, S. W., Suh, M. C., & Lee, C. H., "Computational Modelling Method by Using the Natural Frequencies of Five-Story Stone Pagoda in Chongnimsa Site", Journal of the Korean Association for Spatial Structures, Vol.8, No.5, pp.67-74, 2008
  5. Lee, S. G., Lee, S. M., & Song, C. Y., "The Influence of Spandrel Wall and Fill on the Dynamic Characteristics of Historic Stone Masonry Arch Bridges", Journal of the Korea Institute for Structural Maintenance and Inspection", Vol.9, No.3, pp.161-168, 2005
  6. Kim, B. H., "Developing the vibration-based structural safety evaluation technique for a masonry heritage", Research Report, National Research Institute of Cultural Heritage, pp.118-121, 2013
  7. Yoon, M. H., "Development of Hazard Estimation System for Preservation of Stone Relics", Research Report, National Research Institute of Cultural Heritage, 2003
  8. "Stone Pagodas of Gyeongsangbuk-do I", National Research Institute of Cultural Heritage, pp.294-321, 2003
  9. Scholz, C. H., "The Mechanics of Earthquakes and Faulting", Cambridge University Press, pp.88-89, 1990
  10. Logan, J. M., & Teufel, L. W., "The Effect of Normal Stress on the Real Area of Contact During Frictional Sliding in Rocks", Pure and Applied Geophysics, Vol.124, No.3, pp.471-485, 1986 https://doi.org/10.1007/BF00877212
  11. Bicanicet, N. C., Stirling, C., & Pearce, C. J., "Discontinuous Modelling of Structural Masonry", Fifth World Congress on Computational Mechanics, July, 2002, Vienna, Austria, pp.7-12