한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제33권7호
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  • Pages.17-28
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  • 2017
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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1g 진동대 실험을 통한 건조사질토에 근입된 단독말뚝의 동적 거동 분석

Analysis of Dynamic Behavior of a Single Pile in Dry Sand by 1g Shaking Table Tests

  • 임현성 (연세대학교 토목.환경공학과) ;
  • 정상섬 (연세대학교 토목.환경공학과)
  • 투고 : 2017.02.23
  • 심사 : 2017.06.07
  • 발행 : 2017.07.31
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초록

본 연구에서는 건조사질토 지반에 근입된 말뚝의 동적 거동을 분석하기 위해 1g 진동대 실험을 수행하였다. 지반-말뚝 시스템의 고유 진동수를 측정한 후 고유 진동수를 기반으로 하중 진동수를 산정하고 이에 대한 거동을 분석하였다. 또한, 추가적으로 말뚝의 동적 거동에 영향을 미치는 인자를 분석하기 위하여 입력 가속도, 상부하중, 말뚝 두부 구속 조건에 따른 거동을 분석하였다. 분석결과, 하중 진동수가 지반-말뚝 시스템의 고유 진동수보다 큰 경우 상대적으로 말뚝 두부변위와 휨모멘트가 크게 발생하고 동적 p-y 곡선의 기울기가 작게 나타났다. 또한, 동적 p-y 곡선의 영향인자를 분석한 결과, 말뚝 두부구속조건은 동적 p-y 곡선의 기울기에 영향을 적게 끼침을 확인하였고, 입력가속도, 상부하중 등의 의한 관성력, 지반-말뚝 시스템의 고유 진동수와 입력 진동수의 관계 그리고 지반조건이 동적 p-y 곡선의 기울기에 큰 영향을 끼치는 것으로 확인되었다.

This paper presents the investigation of dynamic behavior of a single pile in dry sand based on 1g shaking table tests. The natural frequency of soil-pile system was measured, and then a range of loading frequency was determined based on the natural frequency. Additionally, the studies were performed by controlling loading accelerations, pile head mass and connectivity conditions between pile and cap. Based on the results obtained, relatively larger pile head displacement and bending moment occur when the loading frequency is larger than the natural frequency of soil-pile system. However, the slope of the p-y curve is smaller in the similar loading frequency. Also, it was found that inertia force like input acceleration and pile head mass, and relation of the natural frequency of soil-pile system and input frequency have a great influence on the slope of dynamic p-y curve, while pile head conditions don't.

키워드

참고문헌

  1. American Petroleum Institute (API) (1987), Recommended practice for planning, designing and constructing fixed offshore platforms, API Recommendation Practice 2A (RP 2A), 17th edition, pp.68-71.
  2. Cox, W. R., Reese, L. C., and Grubbs, B. R. (1974), "Field Testing of Laterally Loaded Piles in Snad", Proc. of the 6th Offshore Technology Conference, Houston, Texas, Paper OTC 2079.
  3. Dou, H. and Byrne, P.M. (1996), "Dynamic Response of Single Piles and Soil-pile Interaction", Canadian Geotechnical Journal, Vol.33, No.1, pp.80-96. https://doi.org/10.1139/t96-025
  4. El Naggar, M. H. and Bentley, K. J. (2000), "Dynamic Analysis for Laterally Loaded Piles and Dynamic p-y Curves", Canadian Geotechnical Journal, Vol.37, pp.1166-1183. https://doi.org/10.1139/t00-058
  5. Gibson, A.D. (1996), "Physical Scale Modeling of Geotechnical Structures at One-g", Ph. D. Thesis, California Institute of Technology Pasadena, California.
  6. Iai, S. (1989), "Similitude for Shaking Table Tests on Soil-structure- Fluid Model in 1g Gravitational Field", Soils and Foundations, Vol.29, No.1, pp.105-118. https://doi.org/10.3208/sandf1972.29.105
  7. Kim, B. C., Jeong, S. S., and Ko, J. Y. (2015), "Proposed Reduction Factor of Cyclic p-y Curves for Drilled Shafts in Weathered Soil", Journal of the Korean Geotechnical Society, Vol.31, No.2, pp. 47-63. https://doi.org/10.7843/KGS.2015.31.2.47
  8. Kim, D. H., Lee, T. G., and Kim, S. H. (2015), "Experimental Study on the Behavior Characteristics of Single Steel Pile in Sand Subjected to Lateral Loadings", Journal of the Korea Academia- Industrial cooperation Society, Vol.16, No.5, pp.3548-3556. https://doi.org/10.5762/KAIS.2015.16.5.3548
  9. Kim, Y. H. and Jeong, S. S. (2009), "Analysis of Laterally Loaded Piles Using Soil Resistance of Wedge Failure Model", Journal of the Korean Geotechnical Society, Vol.25, No.6, pp.59-72.
  10. Kim, Y. H., Jeong, S. S. and Lee, Y. G. (2007), "Effects of Lateral Pile Rigidity of Offshore Drilled Shafts by Developing p-y Curves in Marine Clay", Journal of the Korean Geotechnical Society, Vol. 23, No.6, pp.37-51.
  11. Kim, Y. H., Jeong, S. S., and Won, J. O. (2009), "Effect of Lateral Rigidity of Offshore Piles Using Proposed p-y Curves in Marine Clay", Journal of Marine Geosourses and Geotechnology, Vol.27, No.1, pp.53-77 https://doi.org/10.1080/10641190802625551
  12. Matlock, H. (1970), "Correlations for Design of Laterally Loaded Piles in Soft Clay", Proc. of the 2nd Annual Offshore Technology Conference, Vol.1, Houston, Texas, pp.577-594.
  13. Meymand P. (1998), "Shacking Table Model Test of Nonlinear Soil-pile-superstructure Interaction in Soft Clay", Ph.D. thesis, University of California, Berkeley.
  14. Murchison, J. M. and O'Neil, M. W. (1984), "Evaluation of p-y Relationships in Cohesionless Soils", Analysis and Design of Pile Foudations, ASCE, pp.174-191.
  15. National Cooperative Highway Research Program (NCHRP) (2001), "Static and Dynamic Lateral Loading of Pile Groups", NCHRP Report 461, Transportation Research Board - National Research Council, pp.13-21
  16. Reese, L. C., Cox, W. R., and Koop, F. D. (1974), "Anlaysis of Laterally Loaded Piles in Sand", Proc. of the 6th Offshore Technology Conference, Houston, Texas, Vol.2, No.2080, pp. 473-484.
  17. Reese, L. C., Cox, W. R., and Koop, F. D. (1975), "Field Testing and Analysis of Laterally Loaded Piles in Stiff Clay", Proc. of the 6th Offshore Technology Conference, Houston, Texas, pp. 671-690.
  18. Rovithis, E., Kirtas, E., and Pitilakis, K. (2009), "Experimental p-y Loops for Estimating Seismic Soil-pile Interaction", Bulletin of Earthquake Engineering, Vol.7, No.3, pp.719-736. https://doi.org/10.1007/s10518-009-9116-7
  19. Ting, J. M., Kauffman, C. R., and Lovicsek, M. (1987), "Centrifuge static and dynamic lateral pile behaviour", Canadian Geotechnical Journal, Vol.24, pp.198-207. https://doi.org/10.1139/t87-025
  20. Wilson, D. W. (1998), "Soil-pile-structure Interaction in Liquefying Sand and Soft Clay", Ph.D. thesis, University of California, Davis.
  21. Yang, E. K., Kwon, S. Y., Choi, J. I., and Kim, M. M. (2010), "Prediction of the Natural Frequency of Pile Foundation System in Sand during Earthquake", Journal of the Korean Geotechnical Society, Vol.26, No.1, pp.45-54.
  22. Yang, E. K., Yoo, M. T., Kim, H. U., and Kim, M. M. (2009), "Dynamic p-y Backbone Curves for a Pile in Saturated Sand", Journal of the Korean Geotechnical Society, Vol.25, No.11, pp. 27-38.
  23. Yoo, M. T., Choi, J. I., Han, J. T., and Kim, M. M. (2013), "Dynamic p-y Curves for Dry Sand from Centrifuge Tests", Journal of Earthquake Engineering, Vol.17, pp.1082-1102. https://doi.org/10.1080/13632469.2013.801377
  24. Yoo, M. T., Ha, J. G., Jo, S. B., and Kim, D. S. (2014), "Evaluation of seismic loading of pile foundation structure considering soil-foundation-structure interaction", J. Earthquake Eng., Vol.18, No.3, pp.125-132.