• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.934-939
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• 2004

The Korea high-speed rail, based on the French design. It also implements new concept to increase the strength of bridge deck by adding an impact factor (dynamic intensity factor) in static load. In order to assure the dynamic stability, SYSTRA and Jeseph Penzien, a professor in CEC (the US) conducted a dynamic stability review on design phase. Analyzing the review results, they developed design criteria for dynamic behavior. This study deal with operating PSC box GIRDER equipped with measurement equipment or measured data of Seoul $\∼$ Taejeon, P.S.C BOX GIRDER bridge and steel comsition bridge equipped with measurement equipment based on structual knowledge about configuration of measuring sensor, response analysis of structure when train runs was performed by using measured data of PSC box girder to directly compare with design criteria. moreover, the dynamic stability with comparison of high-speed rail construction criteria was reviewed and analyzed based on historical records.

• Tribology and Lubricants
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• 제28권1호
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• pp.19-26
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• 2012

Rolling contact fatigue of an urban railway wheel was analysed during its rolling. A FEM analysis was performed using a 3D modelling of rail and wheel, considering the slope of the rail and nonlinear isotropic and kinematic hardening behavior of the rail and the wheel. The maximum von-Mises stress and contact pressure between the rail and wheel were 656.9 MPa and 1111.4 MPa, respectively, under axial load of 85 kN with friction coefficient of 0. The fatigue initiation life prediction relationships by strain-lifetime (${\varepsilon}$-N) and Smith-Watson-Topper method were drawn for the wheel steel as follows: $N_i=7.35{\times}10^6{\times}SWT^{-3.56}$ and $N_i=5.41{\times}10^{-9}{\times}(\frac{{\Delta}{\varepsilon}}{2})^{-5.77}$. The fatigue lifetimes of the wheel due to rolling contact were determined to be infinite by ${\varepsilon}$-N and SWT methods.

• 한국안전학회지
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• 제32권4호
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• pp.28-33
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• 2017

A sharp curved ballasted track on earthwork that was connected with a direct fixation slab track on steel box railway bridges have been deformed and damaged despite the frequently maintenance by a restoring force of sharp curved rail and track-bridge interaction forces such as axial forces and longitudinal displacement of continuous welded rail(CWR) owing to their structural characteristics, calling for alternatives to improve the structural safety and track irregularity. In this study, the authors aim to prove a cause of deformation for the sharp curved ballasted tracks to enhance the structural safety and track irregularity of ballasted track in service. A track-bridge interaction analysis and a finite-element method analysis for the sharp curved ballasted track were performed to consider the axial force and longitudinal displacement of CWR, the temperature and the effect of restoring force of sharp curved rail. From the results, the deformation of the sharp curved ballasted track with adjusted sleeper spacing from 833mm to 590mm were significantly reduced.

• Journal of Welding and Joining
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• 제30권5호
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• pp.40-45
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• 2012

Nowadays in Republic of Korea, whole amount of the thermite welding powder for rail joinning is dependent on import. However the demand of the thermite welding powder would be enlarge because some constructing high-speed train and city metro projects are currently in progress. In addition this is the main reason why we should develop the thermite welding powder, domestically. This study is focused on utilizing the recyclable materials like Al powders from cans and iron oxide scales from wire rods as the main components of the thermite welding powder. By minimizing Al content in weld zone by controlling the mixing ratio of the Al powder in the thermite welding powder, the excessive dissolution of the Si and Mn components came from the Al powders could be controled. The tensile strength of welding zone in welded rail was 740 MPa, with that the developed thermite welding powder.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.71-79
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• 2008

The concrete track is being used at the Phase II of the Kyeongbu High Speed Railway and New Constructed Honam High Speed Railway. When it makes a decision of bridge type, It has to consider about longitudinal forces of Continuous Welded Rail, Displacement at the end of bridges, Up-lift forces for fastener on the track. If it is installed turnout on the bridge, There is likelihood of the deck twist by applying the each difference longitudinal forces at the 4 each rails and the buckling by concentration of rail stress at the turnout. Moreover, If it is installed turnout on the continuous bridge and REJ(Rail Expansion Joint) on the main track or turnout track. It is hard to keep a safety for rail because of coming to twist or folding at the expansion of deck on the turnout track. Therefore when it is a design of bridge with turnout. It need to take bridge type to minimize an additional axial force and a displacement at the turnout. This paper makes a study of the composite steel arch bridge that is able to resolve criteria requirements of safety for track with turnout and suggest a helpful design method for bridge considering track with turnout by being based on design and construction method of Eonyang Bridge at the north part of Ulsan Station in Phase II of the Kyeongbu High Speed Railway.

• 한국철도학회논문집
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• 제12권4호
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• pp.574-581
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• 2009

장대레일이 교량구간에 설치되면, 궤도와 교량의 상호작용에 의하여 부가축력과 변위가 발생하게 되므로 설계단계에서 장대레일의 부가축력 및 변위 검토가 필요하다. 본 논문에서는 장대레일 상호작용에 영향을 미치는 주요 인자들을 변수로 종방향 상호작용해석을 수행하였으며, 교량설계단계에서 장대레일 부가축력 및 변위 검토를 간단히 수행할 수 있도록 설계차트로 정리하였다. 본 논문에 제시된 설계차트는 일반철도 교량에 대한 결과로써, 강교량 및 콘크리트 교량, 지갈궤도 및 콘크리트궤도, 단순교(FM방식) 및 연속교(MFM방식)에 대하여 하부강성 및 상부강성별 설계차트로 구분하여 제시되었다.

• 한국철도학회논문집
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• 제12권4호
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• pp.565-573
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• 2009

장대레일이 교량구간에 설치되면, 궤도와 교량의 상호작용에 의하여 부가축력과 변위가 발생하게 되므로 설계단계에서 장대레일의 부가축력 및 변위 검토가 필요하다. 본 논문에서는 장대레일 상호작용에 영향을 미치는 주요 인자들을 변수로 종방향 상호작용해석을 수행하였으며, 교량설계단계에서 장대레일 부가축력 및 변위 검토를 간단히 수행할 수 있도록 설계차트로 정리하였다. 본 논문에 제시된 설계차트는 고속철도 교량에 대한 결과로써, 강교량 및 콘크리트 교량, 자갈궤도 및 콘크리트궤도, 단순교(FM방식) 및 연속교(MFM방식)에 대하여 하부강성 및 상부강성별 설계차트로 구분하여 제시되었다.

• International Journal of Railway
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• 제1권3호
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• pp.106-112
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• 2008

Rolling-sliding, cyclic contact of wheel and rail progressively alters the microstructure of the contacting steels, eventually leading to micro-scale crack initiation, wear and macro-scale crack growth in the railhead. Relating the microstructural changes to subsequent wear and cracking is being accomplished through modelling at three spatial scales: (i) bulk material (ii) multi-grain and (iii) sub-grain. The models incorporate detailed information from metallurgical examinations of used rails and tested rail material. The initial 2-dimensional models representing the rail material are being further developed into 3-dimensional models. Modelling is taking account of thermal effects, and traffic patterns to which the rails are exposed.

• 한국철도학회논문집
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• 제11권6호
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• pp.588-595
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• 2008

본 연구는 우리나라 화주의 수송수단 선택특성을 파악하는 목적으로 수행하였다. 모형의 형태는 개별행태모형이며 SP 자료를 이용하였다. SP 조사는 실험설계를 통해 준비하였다. 고려한 요인은 수송시간, 수송비용, 서비스 수준이다. 연구에서 도출된 시사점은 철도수송의 수요를 증대시키기 위해서는 수송비용을 감소시키는 전략이 가장 효과적이라는 것이다. 화물 품목별로 설명하면, 컨테이너는 수송비용의 감소와 더불어 수송시간을 단축시키고 서비스 수준을 개선할 때 공로수송에 비하여 경쟁력을 확보할 수 있는 것으로 평가되었다. 반면에 양회와 철강 등 벌크화물은 다른 요소보다 수송비용을 인하하는 정책이 효과적이다.

• 전산구조공학
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• 제12권4호
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• pp.69-69
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• 1999

Design of Dangsan Steel Railway Bridge(a part of Seoul Subway Line NO. 2), which is supposed to be replaced after its 15years survice, was done, and the reconstruction has begun in Dec. 1997. The design include new superstruc-ture and bridge piers, retrofitting of the foun-dation, rail system, electric and signal, etc. In this paper, design of the structure is mainly summarized. The main span superstructure, across Han river, is composite section which is com-posed of steel box and reinforced concrete deck slab with 9 span continuous. The superstructure for the approaches is bottom througth type 2-cell steel box girder with steel floor system and concrete deck slab with 3 or 4 span continuous. The bridge piers was planned to be reconstructed based upon the result from the various investi-gations, while the foundation(cassion and pile foundation) was planned to be retrofitted. For superstructure erection, the method of combination of barge bent and heavy lifting and the launching truss method was investigated for the main span and approach spans, respectively.