하중조합과 충전층 두께에 따른 3차원 유한요소 해석에 의한 PST 부재의 거동 분석
PST Member Behavior Analysis Based on Three-Dimensional Finite Element Analysis According to Load Combination and Thickness of Grouting Layer
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
국내뿐만 아니라 세계적인 추세로 증가하고 있는 열차의 고속화와 대량 운송능력의 요구에 따라 열차 궤도구조의 개발은 지속적으로 발전하고 있다. 콘크리트 구조궤도인 PST는 안전성과 경제성에서 그 요구조건을 충족할 수 있는 시스템으로 개발되고 있다. 따라서 본 연구에서는 PST시스템의 각 구조부재의 거동을 분석함으로써 향후 시스템 개발 및 설계에 필요한 정보를 제공하고자 하였다. KRL-2012 열차하중과 KRC 코드에 의한 다양한 정적하중조합에 따른 응력분포 결과를 3차원 유한요소 해석을 통하여 분석하였으며, 그라우트충전층의 두께에따른 결과 또한 제공하고자 하였다. 구조부재별로는 그라우트충전층에서 가장 큰 응력이 발생하였으며 하중조합과 두께에 따라 응력의 변화가 민감하였다. 시동하중 및 온도하중에 의해서는 KRL-2012에 의한 수직하중만 적용할 때와 비교하여 콘크리트 패널과 HSB에서 각각 3.3배,14.1배의 발생응력이 증가하는 것으로 나타났다. 충전층의 두께가 20mm에서 80mm로 증가할 때 콘크리트 패널의 발생 응력은 4% 감소하지만, 충전층은 24% 증가하는 것으로 나타났다. 균열의 양상은 그라우트충전층에서 인장균열이 국부적으로 발생하는 것으로 나타났다. 이와같은 결과에 따라 PST시스템 개발 시에는 수직하중 보다는 수평하중에 의한 휨 및 인장거동에 세심한 주의가 필요하며, 충전층의 두께를 40mm이상 유지함으로써 각 구조부재의 안전성을 확보할 수 있도록 한다.
Abstract
Follofwing the accelerating speed-up of trains and rising demand for large-volume transfer capacity, not only in Korea, but also around theworld, track structures for trains have been improving consistently. Precast concrete slab track (PST), a concrete structure track, was developed as asystem that can fulfil new safety and economic requirements for railroad traffic. The purpose of this study is to provide the information required forthe development and design of the system in the future, by analyzing the behavior of each structural member of the PST system. The stress distributionresult for different combinations of appropriate loads according to the KRL-2012 train load and KRC code was analyzed by conducting athree-dimensional finite element analysis, while the result for different thicknesses of the grouting layer is also presented. Among the structural members,the largest stress took place on the grouting layer. The stress changed sensitively following the thickness and the combination of loads. When comparedwith a case of applying only a vertical KRL-2012 load, the stress increased by 3.3 times and 14.1 times on a concrete panel and HSB, respectively,from the starting load and temperature load. When the thickness of the grouting layer increased from 20 mm to 80 mm, the stress generated on theconcrete panel decreased by 4%, while the stress increased by 24% on the grouting layer. As for the cracking condition, tension cracking was causedlocally on the grouting layer. Such a result indicates that more attention should be paid to the flexure and tension behavior from horizontal loads ratherthan from vertical loads when developing PST systems. In addition, the safety of each structural member must be ensured by maintaining the thicknessof the grouting layer at 40 mm or more.
참고문헌 (23)
- 장승엽, "철도 궤도의 수명주기비용 분석 : 고속철도 자갈궤도와 콘크리트궤도 사례 연구", 한국구조물진단유지관리공학회 논문집, 20(2), pp.110~121 (2016), 한국구조물진단유지관리공학회
- A study on Load-Carrying Structures and Its Design for Low-Maintenance Track on Earthworks, "Ando, K.", ~ (1997)
- Kim, Y. B., "A Study to select the optimum size for the panel of the precast slab track system", Proceedings of the KSR Conference, Korean Society for Railway, pp.740~744 (2011)
- Kang, N. H., "Development of 3 dimensional Precasted Slab Track (3D-PST)", Proceedings of the KSR Conference, Korean Society for Railway, pp.1181~1189 (2013)
- 송지은, "도상안정제에 의한 마모된 철도자갈도상재료의 보강에 대한 실험적 연구", 한국복합신소재구조학회 논문집, 7(3), pp.1~6 (2016), 한국복합신소재구조학회[DOI]
- Jung, W. Y., "Performance Evaluation of Precast Slab Track System According to Design Methods", Proceedings of the KSR Conference, Korean Society for Railway, pp.2017~2022 (2012)
- Han, B. K., "A Simple and Accurate Analysis of Two Dimensional Concrete Slab for a Railroad Bridge by the Composite Laminates Plate Theory", Journal of the Korean Society for Advanced Composite Structures, 2(2), pp.20~25 (2011)
- Kim, Y. B., "The effect of the poor infilling of the underpouring in precast slab track system on structural behavior", Proceedings of the KSR Conference, Korean Society for Railway, pp.256~260 (2010)
- Griffin, D. W., "Finite Element Modelling of Modular Precast Composites for Railway Track Support Structure: A battle to Save Sydney Harbour Bridge", Australian Journal of Structural Engineering, 16(2), pp.150~168 (2015), Taylor & Francis
- Elwi, A. E., "Finite element model for curved embedded reinforcement", Journal of Engineering Mechanics, 115(4), pp.740~754 (1989), ASCE
- Systèmes, D., "Abaqus Analysis User’s Guide, Vol. 6.14-2", Dassault Systèmes, ~ (2015)
- Korea Railway Network Authority, "Railway design guidance and manual", KR C-14040, ~ (2012)
- 이성혁, "아스팔트 콘크리트 설계두께 및 재료특성을 반영한 아스팔트 콘크리트 궤도 3차원 이동하중 동적해석 및 진동특성", 한국철도학회논문집, 19(1), pp.67~76 (2016), 한국철도학회
- Butterfield, R., "The elastic analysis of compressible piles and pile groups", Geotechnique, researchgate, 21(1), pp.43~60 (1971)
- Odemark, N., "Investigations as to the elastic properties of siols and design of pavements according to the theory of elasticity", Meddelande No. 77 Stateus vaginstut, ~ (1949)
- Lubliner, J., "A plastic-damage model for concrete", International Journal of solids and structures, 25(3), pp.299~326 (1989), Elsevier
- Lee, J., "Plastic-damage model for cyclic loading of concrete structures", Journal of Engineering Mechanics, 124(8), pp.892~900 (1998), ASCE
- 김진섭, "후 설치 앵커 성능평가와 해석모델", 한국방재학회논문집, 13(2), pp.89~95 (2013), 한국방재학회
- Cicekli, U., "A plasticity and anisotropic damage model for plain concrete", International Journal of plasticity, 23(10-11), pp.1874~1900 (2007), Elsevier
- "International Union of Railways", 2001
- 한상윤, "곡선 장대레일 궤도와 곡선 교량의 상호작용해석", 한국방재학회논문집, 12(1), pp.119~126 (2012), 한국방재학회
- Rashid, Y. R., "Ultimate strength analysis of prestressed concrete pressure vessels", Nuclear Engineering and Design, 7(4), pp.334~344 (1968), Elsevier
- Pi, Y. L., "Second order nonlinear inelastic analysis of composite steel-concrete members. I: Theory", Journal of Structural Engineering, 132(5), pp.751~761 (2006), ASCE