KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Evaluation of Peak Ground Acceleration Based on Seismic Design Standards in Sejong City Area Using Gyeongju-Pohang Type Design Seismic Waves

경주·포항형 설계지진파를 활용한 세종시 지역의 내진설계기준 지표면최대가속도 성능평가

  • Received : 2023.10.18
  • Accepted : 2023.12.12
  • Published : 2024.02.01
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Abstract

In 2017, the Ministry of the Interior and Safety conducted research for the revision of seismic design standards and performed studies on standard design response spectra. As a result, the Common Application Guidelines for Seismic Design Standards were introduced, and these guidelines have been implemented in the national design standards of the Ministry of Land, Infrastructure, and Transport for practical use. However, it should be noted that the research for proposing standard design response spectra during the 2017 revision was conducted before the occurrence of the significant seismic events in South Korea, such as the 2016 Gyeongju Earthquake and the 2017 Pohang Earthquake. To account for these recent major earthquakes, this study adjusted the standard design spectra based on the records of the 2016 Gyeongju Earthquake and the 2017 Pohang Earthquake and conducted ground response analyses accordingly. The results revealed variations in peak ground acceleration (PGA) at the ground surface even within the same ground classification. It was confirmed that this variation can lead to overestimation or underestimation of seismic loads.

국민안전처는 내진설계기준 개정을 위한 연구를 시행하였으며, 표준설계응답스펙트럼에 대해서 연구를 수행하여 2017년 내진설계기준 공통적용 사항을 제정하였고, 이는 현재 국토교통부의 국가설계기준에도 반영되어 실무에 사용되고 있다. 다만, 2017년 기준 개정 시 표준설계응답스펙트럼 제안을 위한 연구는 2016년 경주 지진과 2017년 포항 지진 이전에 수행되어, 최근 발생한 국내 중규모 이상 지진인 두 지진기록이 연구에 사용되지 않았다. 이들을 고려하기 위해 본 연구에서는 2016년 경주 지진기록과 2017년 포항 지진기록을 기반암의 표준설계스펙트럼에 상응하도록 수정하여 지반응답해석을 수행하였으며, 수행결과로부터 같은 지반분류 내에서도 지표면 최대응답가속도(PGA)가 상이함을 알 수 있었고, 이로 인하여 지진하중이 과대 또는 과소하게 산출될 수 있음을 확인하였다. 지반분류에 따른 지반증폭에 의한 PGA 결정시 불확실성이 존재할 수 있으며, 이러한 불확실성은 결정된 PGA가 실제 발생 값과 다른 값을 가지게 할 가능성 유발한다. 추후 연구에서는 PGA크기에 영향을 주는 여러 영향 요소들 중 현행 지반 분류에서 사용되는 조합(기반암 깊이-속도) 이외에도 영향 요소들의 다양한 조합에 대한 연구가 필요할 것으로 생각된다.

Keywords

References

  1. Cho, H. I., Manandhar, S. and Kim, D. S. (2016a). "Site classification and design response spectra for seismic code provisions - (I) Database and site response analyses." Journal of the Earthquake Engineering Society of Korea, EESK, Vol. 20, No. 4, pp. 235-243, https://doi.org/10.5000/EESK.2016.20.4.235 (in Korean). 
  2. Cho, H. I., Manandhar, S. and Kim, D. S. (2016b). "Site classification and design response spectra for seismic code provisions - (II) Proposal." Journal of the Earthquake Engineering Society of Korea, EESK, Vol. 20, No. 4, pp. 245-256, https://doi.org/10.5000/EESK.2016.20.4.245 (in Korean). 
  3. Cho, H. I., Manandhar, S. and Kim, D. S. (2016c). "Site classification and design response spectra for seismic code provisions - (III) Verification." Journal of the Earthquake Engineering Society of Korea, EESK, Vol. 20, No. 4, pp. 257-268, https://doi.org/10.5000/EESK.2016.20.4.257 (in Korean). 
  4. Idriss, I. M. and Sun, J. I. (1992). User's manual for SHAKE91 : A computer program for conducting equivalent linear seismic response analysis of horizontally layered soil deposits, University of California, Davis. 
  5. Kim, D. S. and Choo, Y. W. (2001a). "Deformation characteristics of hydraulic-filled cohesionless soils in Korea." Proceeding of 4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, Missouri S&T, pp. 1-6. 
  6. Kim, D. S. and Choo, Y. W. (2001b). "Dynamic deformation characteristics of cohesionless soils using resonant column tests." Journal of the Korean Geotechnical Society, KGS, Vol. 17, No. 5, pp. 115-128 (in Korean). 
  7. Kim, J. K., Kim, J. H., Lee, J. H. and Heo, T. M. (2016c). "Development of Korean standard horizontal design spectrum based on the domestic and overseas intra-plate earthquake records." Journal of the Earthquake Engineering Society of Korea, EESK, Vol. 20, No. 6, pp. 369-378 (in Korean). 
  8. Lee, J. S. (2019). A study on microzonation of Sejong city area by site amplification characteristics, MSc. thesis, Chungnam National University (in Korean). 
  9. Ministry of Land, Infrastructure, and Transport(MOLIT) (2018). KDS 17 10 00 Seismic Design General. 
  10. Ministry of Public Safety and Security(MOIS) (2017). Disaster Annual Report, Republic of Korea (in Korean). 
  11. Oh, H. J. and Park, H. C. (2021). "Development of a design seismic wave time history generation technique corresponding to the recorded seismic wave-based design response spectrum." KSCE Journal of Civil and Environmental Engnineering Research, KSCE, Vol. 41, No. 6, pp. 687-695, https://doi.org/10.12652/Ksce.2021.41.6.0687 (in Korean). 
  12. Schnabel, P. B. (1973). Effects of local geology and distance from source on earthquake ground motions, Ph.D. Dissertation. University of California, Berkeley, USA. 
  13. Seed, H. B. and Idriss, I. M. (1970). Soil moduli and damping factors for dynamic response analyses, Report No. EERC 70-10, University of California, Berkeley, Earthquake Engineering Research Center. 
  14. Vucetic, M. and Dobry, R. (1991). "Effect of soil plasticity on cyclic response." Journal of Geotechnical Engineering, ASCE, Vol. 117, No. 1, pp. 89-107, https://doi.org/10.1061/(ASCE)0733-9410(1991)117:1(89).