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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Railway
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Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 3, Issue 4 - Dec 2010
Volume 3, Issue 3 - Sep 2010
Volume 3, Issue 2 - Jun 2010
Volume 3, Issue 1 - Mar 2010
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Overturning Resistance of Plain Concrete Piers in OSPG Railroad Bridges
Rhee, In-Kyu ; Park, Joo-Nam ; Choi, Eun-Soo ;
International Journal of Railway, volume 3, issue 1, 2010, Pages 1~6
The steel plate-girder bridges with concrete gravity piers have possibilities of overturning by lateral inertial force which can be reproduced by sudden earthquake attack. This paper explores an overturning mechanism of existing concrete gravity pier onto the sandy soil in the event of lateral push-over load by in-situ experimental observation. The in-situ push-over experiment for pier with earth anchors between spread footing and rock beds exhibits a reasonable enhancement of ductility against overturning. In unanchored system, a flexural crack at cold joint of concrete pier is not developed because of the over-turning of the pier. This leads a global instability (rotation) of pier-footing system with relatively low stresses in pier itself. While a lateral load is persistently increased in anchored system, the successive flexural cracking failure at cold joint is observed even after the local shear failure of soil due to redistribution of stress equilibrium between soil and pier structure as long as a tensile action of anchor cable is active.
Prediction of Cyclic Freeze-thaw Damage in Concrete Structures Based on an Improved Response Surface Method
Cho, Tae-Jun ;
International Journal of Railway, volume 3, issue 1, 2010, Pages 7~13
The initiation and growth process of cyclic ice body in porous systems are affected by thermo-physical and mass transport properties as well as by gradients of temperature and chemical potentials. Furthermore, the diffusivity of deicing chemicals reaches a significantly higher value under cyclic freeze-haw conditions. Moreover, disintegration of concrete structures is aggravated by marine environments, higher altitudes, and northern areas. A serious concern for concrete engineers is that the property of cyclic freeze-haw with crack growth and the deterioration, caused by accumulated damages hard to be identified by testing. The input variables employed in the analytical predictions are selected as random variables for the limit state functions, followed by reliability analyses. For this purpose, a linear adaptive weighted response surface method (LAW-RSM) has been developed. The verification exhibits a reasonably good correlation with the exact solution of MCS. The important parameters for cyclic freeze-haw-deterioration of concrete structures as water to cement ratio, entrained air pores, and the number of cycles of freezing and thawing are used to construct the limit state function of LAW-RSM. The regression equation fitted to the important deterioration criteria such as accumulated plastic deformation, relative dynamic modulus and equivalent plastic deformations served as the probabilistic evaluation of the performance to resist the structural degradation. The composed improved response surfaces could be utilized to predict the equivalent plastic strains, relative dynamic modulus and residual strains during the cycles of freeze-haw with the probability of failure as changing input random variables. Hence, it is possible to evaluate the life cycle management of concrete structures by the proposed prediction method in consideration of the accumulated damage due to cyclic freeze-thaw.
Design and Characteristic Analysis of LSM for High Speed Train System using Magnetic Equivalent Circuit
Ham, Sang-Hwan ; Cho, Su-Yeon ; Kang, Dong-Woo ; Lee, Hyung-Woo ; Chan, Hong-Soon ; Lee, Ju ;
International Journal of Railway, volume 3, issue 1, 2010, Pages 14~18
This paper describes design and characteristic analysis of long primary type linear synchronous motor (LSM) for high speed train system. LSM is designed using loading distribution method and magnetic equivalent circuit. For characteristic analysis of LSM, analytical and numerical methods are applied. Analytical method for solving the magnetic field distribution of the analytic model is based on the Maxwell’s equations. Using the characteristic equation and magnetic equivalent circuit, we analyze the effect of variation of parameters, and then we validate the result by comparing with numerical method by finite element method (FEM). We compare the analytical method with numerical method for analyzing the effect by variable parameters. This result will be useful of design and forecast of performance without FEM.
Sliding Wear and Corrosion Resistance of Copper-based Overhead Catenary for Traction Systems
Kwok, C.T. ; Wong, P.K. ; Man, H.C. ; Cheng, F.T. ;
International Journal of Railway, volume 3, issue 1, 2010, Pages 19~27
In the present study, the electrical sliding wear and corrosion resistance of pure copper (Cu) and six age-hardened copper alloys (CuCr, CuZr, CuCrZr, CuNiSiCr, CuBe and CuBeNi) were investigated by a pin-on-disc tribometer and electrochemical measurement. Various copper-based alloys in the form of cylindrical pin were forced to slide against a counterface stainless steel disc in air under unlubricated condition at a sliding velocity of 31 km/h under normal load up to 20 N with and without electric current. The worn surface of and wear debris from the specimens were studied by scanning electron microscopy. Both mechanical wear and electrical arc erosion were the wear mechanisms for the alloys worn at 50 A. Owing to its good electrical conductivity, high wear and corrosion resistance, CuCrZr is a promising candidate as the overhead catenary material for electric traction systems.
Feasibility Study and Measuring Some Effects of the Activity Based ManAgement (ABM) in the Iran Railway
Movahedi, Mohammad Mehdi ; Zaribaf, Mehdi ; Moradi, Mohammad Ali ;
International Journal of Railway, volume 3, issue 1, 2010, Pages 28~33
The research is to develop cost methodology to support railway managers for identifying principles, tools and methods of activity based management correctly and precisely, and can be useful and effective for managers for realizing their goals. The research result a ministry can be suitable guideline in terms of how to execute activity based management. Since in this research, main and secondary activities are studied completely in the Railway organization, it can be an explanatory research. The research population is headquarter managers and experts of railway organization and the sampling procedure is goal-oriented and judgmental. 74 people were selected by using a formula. All hypotheses were tested in 95% significance level. Meanwhile a proposed process of applying. activity based management was offered.
Risk Analysis using Failure Data in Railway E&M System
Lee, Chang-Hwan ; Song, Mi-Ok ; Lim, Sung-Soo ;
International Journal of Railway, volume 3, issue 1, 2010, Pages 34~37
In recent, the railway system consists of subsystems as rolling stock and infrastructures as signaling, telecommunication, power supply, overhead contact and platform screen door, etc. Furthermore, each subsystem has complicated interface so as not to understand these relationship. Consequently, to operate the railway system continuously with required safety and availability, the failure data should be corrected and analyzed systematically during operation. To achieve this object effectively, this paper presents the method which is evaluating the operational risk quantitatively using failure data, and selecting the critical equipment. Following this analysis, the improvement plan is established and applied to reduce the operational risk on system or equipment. From this study, the critical equipments of system could be determined and prioritized by risk analysis. Also, the effective maintenance to prevent critical failure could be implanted by this suggested methodology.