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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Railway
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Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 3, Issue 4 - Dec 2000
Volume 3, Issue 3 - Sep 2000
Volume 3, Issue 2 - Jun 2000
Volume 3, Issue 1 - Mar 2000
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Equivalent Continuum Modeling Methods for Flat Corrugated Panels
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 43~50
The corrugated panels are the prime candidate structure for the floor, roof and wall of Korean high speed train. The equivalent continuum modeling approach panels can be used for the efficient design and evaluation of their structural characteristics. The equivalent continuum models, derived from the true complex corrugated panels, should have the same structural behavior as the original structures have. This paper briefly reviews three representative continuum modeling methods: the static analysis method and two plate-models based on modal analysis methods (MAM). These methods are evaluated through some numerical examples by comparing the natural frequencies and static deflections. It is observed that the plate-model based on Rayleigh-Ritz method seems to provide the best results when used in conjunction with the cantilever-type boundary conditions. The equivalent elastic constants of various corrugated panels, depending on the changes in their configurations, are tabulated for efficient use in structural design.
Vibration Characteristics and Prediction of Railroad Track Supporting Structures
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 51~61
In this study, field measurements of vibration on the structures supporting railroad track were performed. The vibration data obtained were analyzed to find out any correlation between its magnitude and several factors such as type of bridges, distance from the track, type of train, frequency characteristics, etc. As a result, the magnitude of vibration turned out to be the highest in the steel bridge, the concrete bridge and steel-concrete combined bridge were the next in descending order. It was also found that the dynamic characteristics of ground were the most important factors among several affecting vibration near by the railroad track. And the empirical ground vibration estimation equation for estimating ground vibration was developed. The proposed equation with respect to distances from the railroad could be easily used for the estimation of ground vibration at the residential areas nearby the track.
Influence of Ventilation on the Subway Radon Level
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 62~67
Modern people stay at indoor places about 90% of a day. Radon-222 is a gas produced by the radioactive decay of the element radium. And, radon is one of the major indoor air pollutants. Radon moves into the underground space through various routes and is considered to cause lung cancer by hurting the lung tissues. In this study, we measured the subway radon level at 9 stations of 3 lines. According to test results, we can figure out the concentration of radon by lines, times, and measuring points. So, it was found that ventilation conditions are the most important factors in the subway air quality. Finally, we suggested effective and economic management methods of air pollution in the subway.
Study on Geosynthetics Appllication Methods for Railway Subbase
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 68~76
Such traditional construction methods as the interchange or improvement of railway subbase maintenance and reinforcement have many problems in the matters of construction period, constructive and economical efficiency aspects. This paper will describe the alternative railway subbase reinforcement method based on geosynthetics system. It is presently very popular in Germany and Japan. In summary it is to say, that geosynthetics used at fine grained subsoils to a strong improvement of the whole railroad system.
Integrity Evaluation of Bogie Frame by Ultrasonic Fractography Analysis
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 77~83
This study proposes the integrity evaluation of the bogie frame using ultrasonic fractography analysis. Analysis objectives in this study are to investigate fracture planes of damaged zone by the A-scan method. The surface condition of fracture planes shows degree of degradation by the stress concentration. The detection of the natural defects in the bogie frame is performed using the characteristics of echodynamic pattern in ultrasonic signal. Results of ultrasonic testing agree fairly well with those of actual fracture plane. In quantitative fractography analysis, microstructures of actual fracture plane turned out to be intergranular and transgranular fracture. Proposed ultrasonic fractography analysis in this study can be used for the integrity evaluation of the bogie frame.
Behavior of High-Speed Rail Roadbed Reinforced by Geogrid under Cyclic Loading
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 84~91
The general concept of reinforced roadbed in the high-speed railway is to cope with the soft ground for the bearing capacity and settlement of foundation soil. The cyclic plate load tests were performed to determine the behavior of reinforced ground with multiple layers of geogrid underlying by soft soil. With the test results, the bearing capacity ratio, elastic rebound ratio, subgrade modulus and the strain of geogrids under loading were investigated. Based on these plate load tests, laboratory model tests under cyclic loading were conducted to estimate the effect of geogrid reinforcement in particular for the high-speed rail roadbed. The permanent settlement and the behavior of earth pressure in reinforced roadbed subjected to a combination of static and dynamic loading are presented.
A Study on the Application of 3-D Sandwich Composite Structures to the Double-deck Light Train Carbody
Journal of the Korean Society for Railway, volume 3, issue 2, 2000, Pages 92~99
Composites are very useful material for light train carbody due to its high specific strength and lightweight characteristics. The composites, called 3-D board, are developed with a special stitching method. In this process, the glass fiber fabrics of skin material and foam core material are stitched together with glass fiber thread. The glass thread in Z-axis turns into FRP form. The conventional delamination problem can be solved with 3-D sandwich structure. In addition, with the lower density of foam, the weight of the panel and the operation expenses can be highly reduced. To evaluate the usefulness of the 3-D board, the double-deck light train carbody is studied. The stress analyses are carried out under various loads and boundary conditions with FEM Code, ANSYS. On comparing with the aluminum carbody, 3-D board carbody can be reduced by about 2 ton for the total weight of carbody.