Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Pile Cap Flexibility on the Response of Pile Group Supported Column

교대를 지지하는 군말뚝의 캡강성효과

  • Published : 2007.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The load deformation behavior of the cap-pile-soil system is investigated, based on numerical analysis. Special attention is given to consideration of pile cap flexibility. Rigid pile cap analysis and flexible cap analysis were conducted for comparison. A numerical method that takes into account the coupling between the rigidities of the piles, the cap, and the column has been introduced to analyze the response of pile group supported columns. The prediction of the lateral loads and bending moments in the pile cap is much more conservative for a flexible cap than for a rigid cap.

본 연구에서는 수치해석을 통해 말뚝캡의 강성에 따른 거동차이를 분석하였다. 따라서 강성캡과 연성캡을 선정하여 상부교각과 하부군말뚝기초를 일체화하여 일련의 해석을 수행하였다. 해석 시 캡강성에 영향을 주는 캡의 탄성계수와 두께, 상부 교각길이, 지반반력, 그리고 말뚝직경 등을 고려하였다. 본 연구결과 군말뚝내 개별말뚝에 작용하는 하중은 말뚝캡의 강성에 크게 좌우되었으며 그 결과, 연성캡 해석결과는 강성캡에 비하여 수평하중과 휨모멘트가 상대적으로 크게 발생하므로 좀 더 보수적인 설계가 가능하리라 판단된다.

Keywords

References

  1. Banerjee, P. K., and Driscoll, P. M. (1976), 'Three-Dimensional Analysis of Raked Pile Groups', Proc. of Institution of Civil Engineers, Vol.61, pp.653-671
  2. Bogard, D. and Matlock, H. (1983), 'Procedures for Analysis of Laterally Loaded Pile Groups in Soft Clay', Proc. Spec. Conf. of Geotech. Engrg. in Offshore Practice, ASCE, pp.499-535
  3. Brown, D., Morrison, C., and Reese L. C. (1988), 'Lateral Load Behavior of Pile Group in Sand', J. of Geotech. Engrg., ASCE, Vol.114, No.11, pp.1261-1267 https://doi.org/10.1061/(ASCE)0733-9410(1988)114:11(1261)
  4. Choi, C. K., and Lee W, H. (1996), 'Versatile variable-node flat-shell element', J. of Engrg. Mech., ASCE, Vol.122, No.5, pp.432-441 https://doi.org/10.1061/(ASCE)0733-9399(1996)122:5(432)
  5. Clancy, P., and Randolph, M. F. (1993), 'An Approximate Analysis Procedure of Piled Raft Foundations', Int. J. for Num. and Anal. Meth. in Geomech., Vol.17, pp.849-869 https://doi.org/10.1002/nag.1610171203
  6. Hrennikoff, A. (1950), 'Analysis of pile foundations with batter piles', Transactions ASCE, Paper No. 2401
  7. Kitiyodom, P., and Matsumoto, T. (2002), 'A Simplified Analysis Method for Piled Raft and Pile Group Foundations with Batter Piles', Int. J. for Num. and Anal. Meth. in Geomech., Vol.26, pp.1349-1369 https://doi.org/10.1002/nag.248
  8. Ooi, P. S. K., Chang, B. K. F., and Wang S. (2004), 'Simplified Lateral Analyses of Fixed-Head Piles and Pile Groups', J. of Geotech. and Geoenviron. Engrg., ASCE, Vol.130 No.11, pp.1140-1151 https://doi.org/10.1061/(ASCE)1090-0241(2004)130:11(1140)
  9. Poulos, H. G. (1971), 'Behavior of Laterally Loaded Piles. II: Pile Groups', J. of Soil Mech. and Found Div., ASCE, Vol.97, No.5, pp.733-751
  10. Randolph, M. F. (1980), 'PIGLET: A Computer Program for the Analysis and Design of Pile Groups under General Loading Conditions', Soil Rep. TR91, CUED/D, Cambridge Univ., England
  11. Reese, L. C: and Wang, S. T. (2004), 'Group 6.0 for Windows, Analysis of a group of piles subjected to axial and lateral loading', Ensoft, Inc., Austin, Tex
  12. Reese, L. C., O'Neill, M. W., and Smith, R. E. (1970), 'Generalized analysis of pile foundations', J. of Soil Mech. and Found Div., ASCE, Vol.96, No.1, pp.235-250
  13. Saul, W. E. (1968), 'Static and Dynamic Analysis of Pile Foundation', J. of Str. Div., ASCE, Vol.94, No.5, pp.1077-1100
  14. US Army Corps of Engineers (1991), Engineering and Design: Design of Pile Foundations. Engineer Manual, No.1110-2-2906
  15. Zhang, H. H., and Small, J. C. (2000), 'Analysis of Capped Pile Groups subjected to Horizontal and Vertical Loads', Comp. and Geotech., Vol.26, pp.1-21 https://doi.org/10.1016/S0266-352X(99)00029-4