[논문]수치해석을 이용한 이중 강-콘크리트 합성말뚝 연직지지력 평가

김정수; 구정민; 김문옥; 정충열; 추연욱

doi:10.14481/jkges.2022.23.12.5

수치해석을 이용한 이중 강-콘크리트 합성말뚝 연직지지력 평가
Estimation on End Vertical Bearing Capacity of Double Steel-Concrete Composite Pile Using Numerical Analysis 원문보기

한국지반환경공학회논문집 = Journal of the Korean Geoenvironmental Society, v.23 no.12, 2022년, pp.5 - 15

김정수 (Department of Future and Smart Construction Research, Korea Institute of Civil Engineering and Building Technology) , 구정민 (DONG MYEONG Eng. Consultants & Architecture Co., LTD.) , 김문옥 (R&D Laboratory, SPEC Engineering Y&P Co., LTD.) , 정충열 (Department of Future and Smart Construction Research, Korea Institute of Civil Engineering and Building Technology) , 추연욱 (Department of Civil & Environmental Engineering, Kongju National University)

초록
AI-Helper

이중 강-콘크리트 합성말뚝의 설계를 위한 지지력 평가 방법이 정립되지 않아 기존 강관말뚝 설계 지지력식이 활용되고 있다. 그러나 이들 설계식 간 지지력 예측 결과가 상이할 뿐만 아니라 일반적으로 가장 보수적인 결과를 채택하게 된다. 이러한 말뚝 지지력 평가방법은 설계의 신뢰성 및 경제성을 낮추게 된다. 본 논문은 수직하중을 받는 이중 강관 내 콘크리트 채움된 신형식 합성단면(DSCT) 말뚝의 역학적 거동을 수치해석적으로 조사하고, 여러 DSCT 말뚝 조건변화에 따른 연직지지력을 분석하였다. DSCT 말뚝 및 인접지반에 대한 축대칭 유한요소모델을 생성하였고, 이를 활용해 근입깊이, 말뚝 선단 채움재 강성, 말뚝 선단 채움재 높이, 기반암층 종류 변화에 따른 영향을 분석하였다. 또한 해석결과를 말뚝 설계 실무에서 주로 사용하는 선단 지지력 평가식과 비교하여 합성말뚝에 대한 기존 강관말뚝 지지력 산정식의 활용 가능성을 검토하였다.

Abstract ▼ AI-Helper

Conventionally, because evaluation methods of the bearing capacity for double steel pipe-concrete composite pile design have not been established, the conventional vertical bearing capacity equations for steel hollow pile are used. However, there are severe differences between the predictions from these equations, and the most conservative one among vertical bearing capacity predictions are conventionally adopted as a design value. Consequently, the current prediction method for vertical bearing capacity of composite pile prediction composite pile causes design reliability and economical feasibility to be low. This paper investigated mechanical behaviors of a new composite pile, with a cross-section composed of double steel pipes filled with concrete (DSCT), vertical bearing capacities were analyzed for several DSCT pile conditions. Axisymmetric finite element models for DSCT pile and surrounding ground were created and they were used to analyze effects on behaviors of DSCT pile pile by embedding depth, stiffness of plugging material at pile tip, height of plugging material at pile tip, and rockbed material. Additionally, results from conventional design prediction equations for vertical bearing capacity at steel hollow pile tip were compared with that from numerical results, and the use of the conventional equations for steel hollow pile was examined to apply to that for DSCT pile.

주제어

표/그림 (18)

그림 Fig. 1. Schematic diagram of DSCT pile
그림 Fig. 2. Normalized bearing capacity at pile tip (JRA, 2002)
표 Table 1. Vertical ultimate capacity of pile
그림 Fig. 3. Changes in bearing capacity of JRA and CFEM
그림 Fig. 4. Ground composition and DSCT cross-section
그림 Fig. 5. Finite element model
그림 Fig. 6. Drucker-Pager model with cap plasticity
표 Table 2. Model parameter for ground: Drucker-Prager model
표 Table 3. Model parameter for DSCT: Linear elastic model
표 Table 4. Numerical analysis cases of DSCT pile
그림 Fig. 7. Effect of embedding depth in rockbed (S.R.)
그림 Fig. 8. Effect of embedding depth in rockbed (W.R.)
그림 Fig. 9. Comparison with vertical bearing capacities with and without grout plugging at pile tip
그림 Fig. 10. Effect of plugging height (S.R., embedding 3m)
그림 Fig. 11. Effect of plugging height (W.R., embedding 3m)
그림 Fig. 12. Stress and displacement distributions of ground surrounding DSCT pile tip: embedding in W.R. with a depth of 3m
표 Table 5. Comparison with vertical bearing capacities of DSCT pile
표 Table 6. Comparison with tip bearing capacities of DSCT pile from design equations and numerical analyses

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