Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

A Study of Soil Spring Model Considering the Seismic Load in Response Spectrum Analysis of Pile-Supported Structure

잔교식 말뚝 구조물의 응답스펙트럼해석 시 지진하중을 고려한 지반 스프링 모델 제안

  • Yun, Jung-Won (Dept. of Civil Engrg., Korea Army Academy at Yeongcheon) ;
  • Kim, Jongkwan (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology) ;
  • Lee, Seokhyung (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology) ;
  • Han, Jin-Tae (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology)
  • 윤정원 (육군3사관학교 건설공학과) ;
  • 김종관 (한국건설기술연구원 지반연구본부) ;
  • 이석형 (한국건설기술연구원 지반연구본부) ;
  • 한진태 (한국건설기술연구원 지반연구본부)
  • Received : 2022.06.30
  • Accepted : 2022.07.20
  • Published : 2022.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, several studies have been conducted on virtual fixed-point and elastic soil spring methods to simulate the soil-pile interaction in response to spectrum analysis of pile-supported structures. However, the soil spring stiffness has not been properly considered due to the seismic load magnitude, and studies on the response spectrum analysis of pile-supported structures considering this circumstance are inadequate. Therefore, in this study, the response spectrum analysis was performed considering the soil spring stiffness according to the seismic load magnitude, and the dynamic behavior of the pile-supported structure was evaluated by comparing it with existing virtual fixed-point and elastic soil spring methods. Comparing the experiment and analysis, the moment differences occurred up to 117% and 21% in the virtual fixed-point and elastic soil spring models, respectively. Moreover, when the analysis was performed using an API p-y curve considering the soil spring stiffness according to the seismic load magnitude, the moment difference between the experiment and analysis was derived at a maximum of < 4%, and it is the most accurate method to simulate the experimental model response.

최근, 잔교식 말뚝 구조물의 응답스펙트럼해석 시 지반-말뚝 상호작용을 모사하기 위해 가상고정점(virtual fixed point) 및 탄성지반스프링(elastic soil spring) 방법에 관한 몇몇 연구가 수행되어 왔다. 그러나, 가상고정점 방법 및 탄성지반스프링 방법의 경우 지진 가속도 크기에 따라 변하는 지반 스프링 강성을 적절히 고려할 수 없으며, 현재까지 이를 고려한 잔교식 말뚝 구조물의 응답스펙트럼해석에 관한 연구는 부족한 실정이다. 그러므로 본 연구에서는 지진 가속도 크기에 따라 변하는 지반 스프링 강성을 고려하여 응답스펙트럼해석을 수행하였으며, 기존에 제시된 가상고정점 및 탄성지반스프링 방법과의 비교를 통해 잔교식 말뚝 구조물의 동적 거동을 평가하였다. 실험 및 해석을 비교한 결과, 가상고정점 모델의 경우 모멘트 차이가 최대 117% 발생하였고, Terzaghi(1955) 탄성지반스프링 모델의 경우 모멘트 차이가 최대 21% 발생하였다. 반면, API(2000) p-y 곡선을 바탕으로 지진 가속도 크기에 따라 변하는 지반 스프링 강성을 고려하여 응답스펙트럼해석을 수행하는 경우 실험 및 해석의 모멘트 차이가 최대 4% 미만으로 도출되어 실험모델의 응답을 가장 적절히 모사하는 것으로 나타났다.

Keywords

Acknowledgement

본 논문은 한국건설기술연구원 주요사업 '건축물 내진성능 확보를 위한 삼축내진말뚝 개선 연구(1/2)'의 지원을 받았으며, 윤정원의 2021년도 박사학위 논문 중 일부 내용을 재구성하여 작성하였습니다.

References

  1. API (RP2A-WSD, A.P.I.). (2000), "Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-Working Stress Design", American Petroleum Institute.
  2. ASCE (American Society of Civil Engineering). (2014), "Seismic Design of Piers and Wharves", American Society of Civil Engineering, USA: ASCE/COPRI 61-14.
  3. CEN (European Committee for Standardization). (1998), "EN 1998-2: Eurocode 8: Design of Structures for Earthquake Resistance. Part 2: Bridges", European Committee for Standardization, Brussels, Belgium.
  4. Chiou, J.S. and Chen, C.H. (2007), "Exact Equivalent Model for a Laterally-loaded Linear Pile-soil System", Soils and foundations, Vol.47, No.6, pp.1053-1061. https://doi.org/10.3208/sandf.47.1053
  5. Davisson, M.T. (1970), "Lateral Load Capacity of Piles", Highway Research Record, (333).
  6. Kim, D.S., Kim, N.R., Choo, Y.W., and Cho, G.C. (2013), "A Newly Developed State-of-the-art Geotechnical Centrifuge in Korea", KSCE journal of Civil Engineering, Vol.17, No.1, pp.77-84. https://doi.org/10.1007/s12205-013-1350-5
  7. Kiureghian, A.D. (1981), "A Response Spectrum Method for Random Vibration Analysis of MDF Systems", Earthquake Engineering & Structural Dynamics, Vol.9, No.5, pp.419-435. https://doi.org/10.1002/eqe.4290090503
  8. Kiureghian, A.D. and Neuenhofer A. (1992), "Response Spectrum Method for Multi-support Seismic Excitations", Earthquake Engineering & Structural Dynamics, Vol.21, No.8, pp.713-40. https://doi.org/10.1002/eqe.4290210805
  9. Lee, S.H., Choo, Y.W., and Kim, D.S. (2013), "Performance of an Equivalent Shear Beam (ESB) Model Container for Dynamic Geotechnical Centrifuge Tests", Soil Dynamics and Earthquake Engineering, Vol.44, pp.102-114. https://doi.org/10.1016/j.soildyn.2012.09.008
  10. Lim, H. and Jeong, S. (2018), "Simplified py Curves under Dynamic Loading in Dry Sand", Soil Dynamics and Earthquake Engineering, 113, 101-111. https://doi.org/10.1016/j.soildyn.2018.05.017
  11. Midas FE. (2016), "Analysis and Algorithm Manual", MIDAS FEA, Gyeonggi, Korea.
  12. MOF (Ministry of Oceans and Fisheries). (2014), "Design Standards of Harbour and Port", Ministry of Oceans and Fisheries, Sejong, Korea (in Korean).
  13. MOF (Ministry of Oceans and Fisheries). (2019), "Design Standards of Harbour and Port", Ministry of Oceans and Fisheries, Sejong, Korea (in Korean).
  14. Ovesen, N.K. (1979), "The Scaling Law Relationship-panel Discussion", In Proc. 7th European Conference on Soil Mechanics and Foundation Engineering, 1979 (Vol.4, pp.319-323).
  15. PIANC (International Navigation Association). (2001), "Seismic Design Guidelines for Port Structures", International Navigation Association, Rotterdam, Netherlands.
  16. Su, L., Dong, S.L., and Kato, S. (2006), "A New Average Response Spectrum Method for Linear Response Analysis of Structures to Spatial Earthquake Ground Motions", Engineering structures, Vol.28, No.13, pp.1835-1842. https://doi.org/10.1016/j.engstruct.2006.03.009
  17. Taghavi, S. and Miranda, E. (2010), "Response Spectrum Method for Estimation of Peak Floor Acceleration Demand", In Improving the Seismic Performance of Existing Buildings and Other Structure, Beijing, China, pp.627-638.
  18. Terzaghi, K. (1955), "Evalution of Conefficients of Subgrade Reaction", Geotechnique, Vol.5, No.4, pp.297-326. https://doi.org/10.1680/geot.1955.5.4.297
  19. Wilkinson, J.H. (1965), "The Algebraic Eigenvalue Problem" (Vol.662). Clarendon: Oxford.
  20. Yoo, M.T., Choi, J.I., Han, J.T., and Kim, M.M. (2013), "Dynamic py Curves for Dry Sand from Centrifuge Tests", Journal of Earthquake Engineering, Vol.17, No.7, pp.1082-1102. https://doi.org/10.1080/13632469.2013.801377
  21. Yun, J.W. (2021), "Evaluation of the Seismic Performance of Pile-supported Structure via Centrifuge Model Test and Improvement of the Response Spectrum Analysis", (Doctoral dissertation).
  22. Yun, J.W. and Han, J.T. (2021), "Evaluation of Soil Spring Methods for Response Spectrum Analysis of Pile-supported Structures via Dynamic Centrifuge Tests", Soil Dynamics and Earthquake Engineering, Vol.141, 106537.
  23. Yun, J.W., Han, J.T., and Kim, J.K. (2020), "Study on Improvement of Response Spectrum Analysis of Pile-supported Structure: Focusing on the Natural Periods and Input Ground Acceleration", Journal of the Korean Geotechnical Society, Vol.36, No.6, pp.17-34. https://doi.org/10.7843/KGS.2020.36.6.17
  24. Yun, J.W., Han, J.T., and Kim, J.K. (2021a), "Evaluation of Seismic Performance of Pile-supported Wharves with Batter Piles through Response Spectrum Analysis", Journal of the Korean Geotechnical Society, Vol.37, No.12, pp.57-71. https://doi.org/10.7843/KGS.2021.37.12.57
  25. Yun, J.W., Han, J.T., and Kim, J.K. (2022), "Evaluation of the Virtual Fixed-point Method for Seismic Design of Pile-supported Structures", KSCE Journal of Civil Engineering, Vol.26, pp.596-605. https://doi.org/10.1007/s12205-021-0422-1
  26. Yun, J.W., Han, J.T., and Kim, S.R. (2019), "Evaluation of Virtual Fixed Points in the Response Spectrum Analysis of a Pile-supported Wharf", Geotechnique Letters, Vol.9, No.3, pp.238-244. https://doi.org/10.1680/jgele.19.00013
  27. Yun, J.W., Han, J.T., and Lee, S.H. (2021b), "Evaluation of Seismic Performance of Pile-supported Wharves Installed in Saturated Sand through Response Spectrum Analysis and Dynamic Centrifuge Model Test", Journal of the Korean Geotechnical Society, Vol.37, No.12, pp.73-87. https://doi.org/10.7843/KGS.2021.37.12.73