KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Optimization for Configuration and Material Cost of Helical Pile Using Harmony Search Algorithm

하모니서치 알고리즘을 이용한 헬리컬 파일의 형상 및 재료비 최적 설계기법에 대한 연구

  • 나경욱 (고려대학교 건축사회환경공학부) ;
  • 이동섭 (고려대학교 건축사회환경공학부) ;
  • 이현지 (고려대학교 건축사회환경공학부) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Received : 2014.10.02
  • Accepted : 2015.03.03
  • Published : 2015.04.01
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Abstract

The helical pile is a manufactured steel pile consisting of one or more helix-shaped bearing plates affixed to a central shaft. This pile is installed by rotating the shaft into the ground to support structural loads. Advantages of the helical pile are no need for boring or grout process, and ability to install a pile foundation with relatively light devices. In this study, an optimized design method for helical piles is proposed to minimize the material cost with consideration of the load bearing capacity obtained by the cylindrical shear method. The harmony search meta-heuristic algorithm was adopted for optimization process. The optimized design was verified by comparing with the 2009 International building code. It is noted that the optimization for the configuration of helical piles along with material cost proves to be an out-performed tool in designing helical pile foundation with economic feasibility.

헬리컬 파일은 한 개 이상의 나선형 원판을 중공형 강재 축에 부착한 후 지반에 회전 관입시켜 지지력을 발현하게 하는 말뚝기초의 한 종류로서 별도로 천공작업 및 그라우팅을 필요로 하지 않고, 시공의 편의성과 말뚝 항타 등에 의한 소음이 없다는 장점이 있어 그 이용이 점차 증가되고 있는 추세이다. 본 연구에서는 Cylindrical shear method로 산정된 헬리컬 파일의 요구 지지력을 최소의 자재비용과 최적의 헬리컬 파일의 형상으로 발현할 수 있도록 하모니서치 알고리즘(Harmony search algorithm)을 적용하여 최적화된 설계법을 제안 하였다. 또한 헬리컬 파일의 최적 설계 결과를 2009 International building code (이하, 2009 IBC)를 참고하여 규격화시킨 설계 결과와 비교 검토하여 두 설계법의 경제성을 분석하였다. 본 논문의 재료비 최소화를 위한 헬리컬 파일 형상의 최적 설계 기법은 헬리컬 파일의 경제성을 향상하여 헬리컬 파일 시장 활성화에 기여할 수 있다.

Keywords

References

  1. Darin Willis, P. E. (2010). How to design helical piles per the 2009 international building code., Available at : http://www.foundationrepairnetwork.com/design-helical-piles.pdf (Accessed: April 02, 2014).
  2. Ghaly, A. M. and Hanna, A. M. (1992). "Stresses and strains around helical screw anchors in sand." J. of Soils and Foundations, Vol. 32, No. 4, pp. 27-42. https://doi.org/10.3208/sandf1972.32.4_27
  3. Ghaly, A. M. and Hanna, A. M. (1994b). "Ultimate pullout resistance of single vertical anchors." J. of Canadian Geotechnical, Vol. 31, No. 5, pp. 661-672. https://doi.org/10.1139/t94-078
  4. Ghaly, A. M. and Clemence, S. P. (1998). "Pullout performance of inclined helical screw anchors in sand." J. of Geotechnical Engineering, ASCE, Vol. 124, No. 7, pp. 617-627. https://doi.org/10.1061/(ASCE)1090-0241(1998)124:7(617)
  5. Geem. Z. W., Kim. J. H. and Loganathan. G. V. (2001). "A new heuristic optimization algorithm: Harmony Search." J. of Simulation, Vol. 76, No. 2, pp. 60-68. https://doi.org/10.1177/003754970107600201
  6. Hoyt, R. M. and Clemence, S. P. (1989). "Uplift capacity of helical anchors in soil." Proc. of the 12th Int. Conf. on Soil Mechanics and Foundation Engineering, Rio de Janeiro, Brazil, Vol. 2, pp. 1019-1022.
  7. ICC-Evaluation Services (2007). AC358 Acceptance criteria for helical pile foundations and devices, Available at: www.icc-es.org.
  8. Lee, K. S. and Geem, Z. W. (2004). "A new meta-heuristic algorithm for continuous engineering optimization : Harmony Search Theory and Practice." J. of Computer methods in applied mechanics and engineering, Vol. 194, No. 36, pp. 3902-3933.
  9. Lee. S. K., Ko. K. E. and Sim. K. B. (2011). "Study on improvement of convergence in harmony search algorithm." J. of Korea intelligent information system society, Vol. 21, No. 1, pp. 31-34.
  10. Mooney, J. S., Adamczak S. Jr. and Clemence, S. P. (1985). "Uplift capacity of helix anchors in clay and silt." Proc. of Conf, on Uplift Behavior of Anchor Foundations in Soil, ASCE, Detroit, Michigan, pp. 48-72.
  11. Meyerhof, G. G. (1951). "The ultimate bearing capacity of foundations." J. of Geotechnique, Vol. 2, No. 4, pp. 301-332. https://doi.org/10.1680/geot.1951.2.4.301
  12. Mitsch, M. P. and Clemence, S. P. (1985). "The uplift capacity of helix anchors in sand." Proc. of Conf, on Uplift Behavior of Anchor Foundations in Soil, ASCE, Detroit, Michigan, pp. 26-47.
  13. Peck, R. B., Hanson, W. E. and Thornburn, T. H. (1974). Foundation engineering, John Wiley & Sons, Inc, New York, N.Y.
  14. Perko, H. A. (2009). Helical piles : A Practical Guide to Design and Installation, John Wiley & Sons, Inc, Hoboken, New Jersey
  15. Parry, R. H. G. (1977). "Estimating bearing capacity of sand from SPT values." J. of Geotechnical Engineering Division, ASCE, Vol. 103, No. 9, pp. 1014-1019.
  16. Terzaghi, K.. and Peck, R. B. (1967). Soil mechanics in engineering practice, John Wiley and Sons, New York, N.Y.
  17. Terzaghi, K. (1943). Theoretical soil mechanics, John Wiley and Sons, New York, N.Y.