Influence of Pile Cap's Boundary Conditions in Piled Pier Structures

교량 말뚝기초의 단부 지점조건의 영향분석

  • Published : 2005.07.01

Abstract

Modeling techniques of piled pier were reviewed and the influences of pile cap's boundary conditions were analyzed in this study. The method using flexible springs seems to be useful fur the practical design since its simplified model can represent the complex behaviors of pile groups efficiently. Parameter studies were performed far various pile group arrangements, pile spacings, end bearing conditions, and loading stages to analyze their effects on the lateral displacements, maximum pile bending stresses, and lateral stiffness of pile groups. Through the parameter studies, it was found that when lateral stiffness of pile groups was estimated by using three-dimensional analysis method (YSGroup), its complex behavior could be predicted better than other methods based on single pile analysis.

본 논문에서는 교량 말뚝기초의 모델링기법에 관한분류 및 단부 지점조건의 영향을 분석하였다. 연성스프링 방법은 모델링 형태가 간편하면서도 복잡한 군말뚝 거동을 효과적으로 나타낼 수 있으므로 실제 설계에 유용한 방법이다. 다양한 말뚝 배열, 말뚝 간격, 선단지지조건, 그리고 하중크기에 따라 3차원 해석기법(YSGroup)을 통해 영향인자 분석을 수행하였으며, 그 결과 횡방향 변위, 최대 말뚝 휨응력, 그리고 군말뚝의 횡방향 스프링강성을 산정, 이를 비교$\cdot$분석하였다. 영향인자 분석을 통해 3차원 해석기법(YSGroup)을 통해 횡방향 스프링강성을 산정한 경우는 다른 단독말뚝 해석을 통해 산정한 경우에 비하여 복잡한 군말뚝 거동을 보다 적절히 예측함을 알 수 있었다.

Keywords

References

  1. 도로교설계기준 해설(하부구조편) (2001), 대한토목학회, pp.268-272
  2. 원진오, 정상섬 (2005), '교량 말뚝기초 해석기법의 적용성 분석', 한국지반공학회 논문집, 제21권, 4호, pp.123-134
  3. 원진오, 정문경, 곽기석, 정상섬 (2004), '홍수시 충격하중 및 유수압을 고려한 교량기초 해석' 대한토목학회지, 제24권, 제IC호, pp.49-55
  4. Chang, Y. L. (1937), 'Discussion of Lateral Pile Loading Tests by Feagin', Transactions of ASCE 102, pp.272-278
  5. FHWA. (1988), 'Drilled Shaft Construction Procedure arid Design Method', FHWA 88/042
  6. Hoit, M. I., McVay, M., Hays, C., and Andrade, P. W. (1996), 'Nonlinear Pile Foundation Analysis using Florida-Pier', Journal of Bridge Engineering, Vol.1, No.4, pp.135-142 https://doi.org/10.1061/(ASCE)1084-0702(1996)1:4(135)
  7. Mokwa, R. L. (1999), 'Investigation of the Resistance of Pile Caps to Lateral Loading', Ph.D thesis, Virginia Polytechnic Institute and State University
  8. Polam, I., Kapuskar, M. and Chaudhuri, D. (1988), 'Modeling of Pile Footings and Drilled Shafts for seismic Design', Technical Report MCEER-98-0018
  9. Poulos, H. G. (1979), 'Group Factors for Pile-Deflection Estimation', Journal of the Geotechnical Engineering Division, ASCE, Vol.105, No.12, pp.1489-1509
  10. Poulos, H. G. and Davis, E. H. (1968), 'The Settlement Behavious of Single Axially-Loaded Incompressible Piles and Piers', Geot Vol.1: 351-371
  11. Reese, L. C., Cox, W. R. and Koop, F. D. (1974), 'Analysis of Laterally Loaded Piles in Sand', Paper No. OTC 2080, Proceedings, Fifth Annual Offshore Technology Conference, Houston, Texas
  12. Zafir, Z. (2002), 'Seismic Foundation Stiffness For Bridges', Deep Foundations 2002, pp.1421-1433