• Journal of the Korean Society of Hazard Mitigation
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• v.7 no.1 s.24
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• pp.29-38
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• 2007

The research on the track performance and stability of the tilting-train was performed and the settlement of the roadbed was estimated as the tilting train was being operated on the rail joint under the allowable velocity subjected to the track performance and the stability of the tilting-train. Since the impact on the continuous welded rail (CWR) induced by the tilting-train loading is different from the impact on the rail joint, it needs to investigate the settlement of the roadbed beneath the CWR. In this study, when the tilting-train is being operated on the CWR under the allowable velocity subjected to the track performance and the stability of the tilting-train, the settlement and bearing capacity of the roadbed beneath the CWR have been evaluated using numerical analysis and compared with those beneath the rail joint. The numerical results show that the settlements of the roadbed beneath CWR and rail joint are amount to 71.2% and 88.8% of the allowable settlement, respectively. And the stresses are amount to 10.4% and 12.1% of the allowable bearing capacity, respectively.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.14 no.6
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• pp.1319-1327
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• 1994

Since fatigue cracks in rail can be the source of fractures and subsequent derailments, quantitative evaluation of the fatigue behavior and fracture properities due to the analysis results of laboratory test are drawn on the basis for predicting fatigue life and making a decision of safe inspection interval. Charpy V-notch and fracture toughness behavior were evaluated from the results of Charpy impact test. Fatigue test was performed by using CT type specimen under constant amplitude loading, and finally the effects of the following parameters; crack orientation, temperature, and stress ratio, on the fatigue crack growth behavior were studied.

• Proceedings of the KSR Conference
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• 2000.11a
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• pp.319-327
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• 2000

본 연구는 국내 독자기술의 절대적 빈곤속에서 외국기술에만 의지하는 레일체결장치의 국내 현실을 탈피하기 위하여 독자적인 한국형 레일체결장치 개발을 시도하는 것이다. 본 연구에서는 판 스프링은 제외하고 봉 스프링(coil spring)에 대해서만 우선적으로 시제품을 개발하였다. 세계적으로 유명한 체결장치의 장ㆍ단점을 분석하여 장점만을 취하고자 하는 설계 목적을 가지고 새로운 레일체결장치의 개발에 착수하였다. 본 장치의 개념설계를 통하여 유지보수성과 안전성을 동시에 확보할 수 있도록 하였다. 현재 장치의 모형제작을 통하여 조립성 및 가능성을 타진하였으며 전산응력해석을 통하여 체결 스프링 및 숄더의 적정치수를 산정 하였다. 본 연구는 국내에서 본격적인 체결장치개발의 시초가 되기를 희망한다.

• Journal of the Earthquake Engineering Society of Korea
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• v.13 no.3
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• pp.29-38
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• 2009

n the event of an earthquake, additional stresses can occur in the continuous welded rails (CWR) of High-speed railway (HSR) bridges due to relative displacements at expansion joints, and this stress can cause derailment. The amplification of ground motion occurs as a result of site effects, and this is pronounced at the site of a soft surface soil layer and of a rigid surface soil layer over a soft one. As a result, the amplified ground motion leads to an amplified seismic response in HSR bridges. A change in bridge pier height affects the seismic behavior of the bridge. A HSR bridge with gravel ballast tracks will show different dynamic behavior during an earthquake than one with concrete ballast tracks. The seismic responses of HSR bridges and their CWR are analyzed considering the derailment-inducing factors.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.577-578
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.363-364
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• 2006

The important factor to evaluate the running safety of a railway vehicle would be the interaction force between wheel and rail(derailment coefficient), for which is one of important factors to check the running safety of a railway vehicle that may cause a tragic accident. In this paper, when interaction force between wheel and rail happens to wheel-set of tilting vehicles, it analyzes stress distribution and verified safety.

• Journal of the Korean Society for Railway
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• v.7 no.3
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• pp.186-192
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• 2004

Using the finite element method, rail-wheel contact model has been analyzed for mechanical loads due to passengers and payload of the train. This paper presents an investigation on how tapered wheel and inclined rail surfaces affect the contact stress and displacement of rail-wheel contacting surface under mechanical loads. For a numerical analysis, the tapered faces of the wheel are considered as 2.5% and 5.5%. And two models of the tilted rail are also considered as 40：1 and 20：1 at the bottom of the rail. The computed results based on the contact stress and displacement FE analysis indicate that the tilting ratio of the rail, 20：1 with a tapered face of the wheel, 2.5% may be more stable compared to that of 40：1 tilting model and 5.5% tapered wheel face.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.2511-2518
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• 2014

An ERS(Embedded Rail System) has large effect on the load distribution because of its continuous rail support. Therefore, stress level of the track components is lower than that of other system. Though the ERS has various advantages, the application example in a domestic railway is rarely applied and the studies for the application of high-speed service lines are insufficient. In this paper, the vertical stiffness is derived from laboratory test and the optimized cross-section is also derived from the analytical analysis as a basic study for application of ERS on the high-speed service lines.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8812-8819
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• 2015

In a situation in which importance of rail fastening system is growing with increasing the construction of concrete track, an accident of tension clamp(the component of rail fastening system) breaking has been recently occurred. This results from various factors such as field condition, operating agency, running condition, traffic frequency and so on. Thus, the study for the behavior of tension clamp is required. In this paper, an experiment and finite element analysis(FEA) have been performed to analyse the mechanical behavior of tension clamp. The stress and displacement of tension clamp have been analyzed as the clamping force through a laboratory test, and they were compared with FEA results. Furthermore, the stress and displacement of the tension clamp are derived from train load condition applying the verified model, and the fatigue vulnerability of the tension clamp is identified through stress analysis.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.948-954
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• 2004

This study deals with the Evaluation of track system, when Newly developed Korea High Speed Train(KHST) by KRRI and KTX trains are running pass curved track of conventional line. In order to evaluate stability of track and vehicle running safety. the effect of curve radius, the field tests were performed at sharply curved track.