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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 9, Issue 6 - Dec 2006
Volume 9, Issue 5 - Oct 2006
Volume 9, Issue 4 - Aug 2006
Volume 9, Issue 3 - Jun 2006
Volume 9, Issue 2 - Apr 2006
Volume 9, Issue 1 - Feb 2006
Selecting the target year
Field Test to Investigate the Thermal Stress of Continuous Welded Rail on High Speed Railway Bridges in Summer Period
Kwark, Jong-Won ; Choi, Eun-Suk ; Chin, Won-Jong ; Lee, Jung-Woo ; Kim, Byung-Suk ; Kang, Jae-Yoon ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 131~136
Most modern railways, especially the high speed railway tracks, use continuous welded rail(CWR) for the less maintenance. For the CWR track has very few expansion joints, track buckling has always been an unpredictable event and it happens mainly by high compressive stress in rail in summer period. Therefore, it is important to understand the variation of rail stress induced by thermal loads which has direct influence on the rail buckling and stability of railway track. This paper describes the experimental investigation of the variation of rail temperature and stress in a high speed railway track on bridge structure. Field measurement was performed to examine the correlation between the rail temperature and rail stress on the Korean High Speed Railway line. Regression functions were derived from measured data to determine the rail stress f3r an arbitrary rail temperature varies from 20 to 50 degree Celsius.
A Study on the Dynamic Behavior a 3 Span Continuous Extradosed PSC Railway Bridge
Kim, Sung-Il ; Kim, Yun-Tae ; Gill, Tae-Soo ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 137~144
The Extradosed PSC bridge is one of the best alternates which not only covers the longer span than PSC box girder and also performs the role of landmark facility with much cheaper cost than cable stayed bridge. Since the cable-stayed long span bridge is more flexible than general medium span bridges and railway bridges can be experienced resonance phenomenon by repeated equidistant axle loading of the train, it is inevitable to consider the dynamic behavior on impact, deflection and so on. In the present study, the dynamic behavior of an Extradosed PSC railway bridge subjected to moving train forces is analyzed. As well as trains which operate in conventional railway tines, KTX train is also considered. For the estimation of dynamic performances of the Extradosed PSC bridge, vertical deflection, accelerations of the slab, end rotation of the girder and impact on pylons and cables are discussed.
Evaluation of Overturning Safefy for a Tilting Train by Carbody Tilting
Kim, Nam-Po ; Seo, Sung-Il ; Kim, Jung-Seok ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 145~150
In this study, overturning safety for a tilting train has been evaluated. In the tilting train, the overturning safety is one of the most important factors because the carbody inclines inward a curve during curve negotiation. Dynamic analysis considering unbalanced lateral acceleration and carbody tilting has been carried out and the overturning safety for the tilting train has been evaluated according to height of CG of carbody. From these studies, the overturning safety for the tilting train under unbalanced lateral acceleration of
was superior to the conventional one at the same running speed.
An Experimental and Analytical study on the Steel Plate Girder Railway bridge in the applying External Post-tensioning Method
Park, Young-Hoon ; Cho, Sun-Kyu ; Choi, Jung-Youl ; Park, Yong-Gul ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 151~159
It analyzed the mechanical behaviors of non-ballasted railway bridge (steel plate girder type) with ballast reinforced on the finite element analysis, field test and laboratory test far the static and dynamic responses. The major objective of this study is to investigate the effects and application of reinforcement for steel plate girder railway bridge by the external post-tensioning method. The reinforcement of non-ballast railway bridge had obviously stable dynamic behaviors due to the additional dead force which was ballast. But in case of static behaviors, static displacements and stresses had increased nearly the allowable values. Therefore we analyzed the mechanical behaviors of non-ballasted railway bridge with ballast reinforced and external post-tensioning reinforced on the finite element analysis and laboratory test for the static and dynamic behavior. As a result, the reinforcement of ballasted railway bridge the external post-tensioning method are obviously effective for the additional dead force which is ballast. The analytical and experimental study are carried out to investigate the post-tension force decrease bending behavior and deflection in composite bridge for serviceability. The servicing railway bridge with ballast reinforced has need of the reasonable reinforcement measures which could be reducing the effect of additional dead load that degradation phenomenon of structure by an unusual. stresses and a drop durability.
A Study on Dynamic Behaviors of Steel Plate Girder bridge with Applying External Post-Tensioning Method
Choi, Dong-Ho ; Choi, Jung-Youl ; Choi, Jun-Hyeok ; Park, Yong-Gul ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 160~168
The major objective of this study is to investigate the effects and application of external post-tensioning method far steel plate girder bridge. It analyzed the mechanical behaviors of steel plate girder bridge with applying external post-tensioning on the finite element analysis, field test and laboratory test fur the lateral dynamic characteristics. As a result, the reinforcement of steel plate girder bridge the external post-tensioning method are obviously effective for the lateral dynamic response which is non-reinforced. The analytical and experimental study are carried out to investigate the post-tension force decrease lateral acceleration and deflection on steel plate girder bridge for serviceability. And the external post-tensioning method reduce dynamic maximum displacement(about
), the increase of dynamic safety is predicted by adopting external post-tensioning method. From the dynamic test results of the servicing steel plate girder bridge, it is investigated that the change degree of natural frequency is very low with applying the external post-tensioning method The servicing steel plate girder bridge with external post-tensioning has need of the reasonable reinforcement measures which could be reducing the effect of lateral dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.
Fatigue Life Evaluation for Railway Turnout Crossing using the Field Test
Um, Ju-Hwan ; Choi, Jung-Youl ; Park, Yong-Gul ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 169~173
The major objective of this study is to investigate the fatigue life evaluation of immovability crossing for railway turnout by the field test. In railway engineering, an appliance is necessary to allow a vehicle to move from one track to another. This appliance came to be known technically as turnout. So, turnout is required very complex railway technologies such as rolling stock, track. Due to the plan under the application of high speed train, turnout are needed more stable far fatigue behaviors. It analyzed the mechanical behaviors of turnout crossing with propose its advanced technical type on the field test and fatigue evaluation far the dynamic fatigue characteristics. As a result, the advanced type crossing are obviously effective for the fatigue damage ratio and dynamic response which is non-modified type. The analytical and experimental study are carried out to investigate the passing path of contact surface and fatigue damage trend decrease dynamic stresses and deflections on advanced crossing type, And the advanced type reduce dynamic fatigue damage ratio and increase fatigue life(about each 38%) more than non-modified type. From the field test results of the servicing turnout crossing, it is evaluated that the modification of contact angle, weight, material and sectional properties is very effective fur ensure against fatigue risks.
Estimation of RPS Method Using 3-Dimensional Numerical Analysis
Roh, Jeong-Min ; Shin, Eun-Chul ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 174~179
Recently, the crossing tunnel has been constructed frequently to connect the separated area by highway and railroad. The construction of crossing tunnel must be progressed while maintaining the existing traffic of the highway as well as railroad. There are many cross funnelling methods such as NTR, TRCM, Messer Shield, Front Jacking, and Pipe Roof Method. The advantages of adopting RPS(Roof Panel Shield) method in crossing tunnel construction with comparing other existing cross funnelling methods are needed a little volume of concrete and easy to change the direction of cutting shoe during the construction of pipe roof, The 3-dimensional numerical analysis of RPS to consider the arching effect was performed for the application in the crossing tunnel under railroad. The earth pressure distribution and settlement were predicted when the RPS method was applied during the excavation for crossing railroad tunnel construction.
Static Behavior of Reinforced Railway Roadbed by Geotextile Bag
Lee, Dong-Hyun ; Shin, Eun-Chul ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 180~186
In this study, a large-scale laboratory model test, 2-D and 3-D numerical analyses were conducted to verify the reinforcement effect by utilizing geotextile bag on the railway roadbed. Static loading which simulated train load was applied on the geotextile bag-reinforced railway roadbed and also unreinforced railway roadbed, Computer program named Pentagon which is a part of FEM programs was used in the numerical analysis. Based on the results of laboratory test, 2-D and 3-D numerical analyses, the effect of load distribution and settlement reduction was found to be depending on the geotextile characteristics, tensile strength of geotextite, and interface friction angle between geotextile bags. In general, the result of 2-D and 3-D numerical analyses shows lower value than that of laboratory test. Also, the result of 3-D numerical analyses shows lower value than that of 2-D numerical analyses because of its stress transfer effect.
Analysis method for the Measured Track Geometry Data using Wavelet Transform
Lee, In-Kyu ; Kim, Sung-Il ; Yeo, In-Ho ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 187~192
The regularity of railway track alignment is a crucial component fur maintaining travel safety and the smoothness of passenger ride. The conventional spectral analysis has been considered to estimate the severity of the track irregularity from measured data. The time domain data used to be changed into the frequency domain by Fourier transform. Because the measuring points can be regarded as the time points, the spatial-frequency can be introduced instead of the time-frequency. Although FFT(Fast Fourier Transform) and/or PSD(Power Spectral Density) function could provide fairly localized information within frequency domain, but chronical configurations of data could be missed. In this study, we attempt to apply the Morlet wavelet transform for the purpose of a frequency-time-domain analysis rather than a frequency-domain analysis. The applicability of wavelet transform is examined for the estimation of the track irregularity with real measured track data on the section of Kyoung-bu line by EM-120 measuring vehicle. It is shown that the wavelet transform can be an effective tool to manage the track irregularity.
The Strategy for the Development of Impact Area around Urban Rail Transit Station
Lee, Tai-Sik ; Park, Kyoung-Soon ; Kim, Young-Hyun ; Yun, Sang-Yoon ; Lee, Jong-Ha ; Lee, Dong-Wook ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 193~199
The financial incomes of urban rail transit authorities have been only from the fares. In order to increase the customers and expand the scope of enterprise, it is the most feasible mean to develop the area around the stations. Current experiences have confronted the excessive concentration of population and traffic congestion due to the lack of systematic planning and the excessive focus on the business. This study reviewed the necessity of the impact area around the urban rail transit stations by the organizational analysis for the urban rail transit authorities, and reviewed domestic/foreign cases. Finally, This study suggested the strategy for the development of impact area around the urban rail transit stations.
The Improved Device of Seoul Subway Fare System
Lee, Tai-Sik ; Jun, Young-Joon ; Kwon, Ou-Chul ; Chung, Jong-Ky ; Lee, Dong-Wook ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 200~205
Subway widely used as a major mean of public transportation both at home and abroad contributes to ease chronic traffic congestion in cities. However, subway operating expense is expected to increase continuously because subway requires vast amount of money at the construction stage, huge sum of maintenance cost is spent during operation, and passenger needs for more convenient facilities is increasing. on the contrary to enormous operating expenses, fare that is occupying most of operating income doesn't come up to its prime cost causing chronic operating deficit. It is urgent to prepare fare system improvement measures to increase operating income in order to resolve financial difficulty of a subway operating organization. Therefore, the current study analyzed present condition and problems of subway fare system, and suggested improvement measures such as improvement of fare adjustment procedure, improvement of free-ride system, diversification of ticket, etc.
A Study on Korean Railroad Crew Rostering Problem
Yang, Tae-Yong ; Kim, Young-Hoon ; Lee, Dong-Ho ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 206~211
This thesis presents railroad crew restoring problem, which is to determine the railroad plan allocation. This problem is constructed that determine the sequence of duties that railroad crews have to perform. We analyze characteristic of this problem and railroad industry. It's hard to consider many constraint conditions. We propose Integer Programming model and easy methodology to be considered all given operation rules. This problem is known to be NP-hard. We develop a genetic algorithm, which is proved to be powerful in solving optimization problems. We proposed the effective mathematical model and algorithm about making crew restoring in real industry.
The Outcomes and Tasks of UK Rail Privatization in case of Safety
Lee, Yong-Sang ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 212~221
This paper examines the outcomes and tasks of U rail privatization especially focusing on the rail safety. Earlier research which focused on the rail safety had little knowledge of the explanations for recent changes of safety scheme. Moreover, they had difficulty making a direct comparison of safety between national rail and the privatized rail. Therefore we are left without a good explanation which has a comprehensive perspective. I attempt to show the outcomes of safety in the rail privatization process and its tasks focusing on the recent fatal accident. This paper argues that the UK's rail safety has a framework which is too complicated with overlapping responsibilities that brought about inefficiency, increasing costs. Especially infrastructure enterprise did not come to play an appropriate role. However, after 2000, the government took charge of setting the strategy for railway safety, and the Office of Rail Regulation covered safety, performance and cost. I explain that these changes present a good opportunity to solve the problem of passing the buck for rail accident. Through the analysis, I find that outcomes of rail privatization in safety are improved comparing the national rail. However, safety performance, for example the collision of structures of cars and looseness of rail should be improved. In future, the problems of fatal accident and a bit of duplicate safe system should be addressed.
Optimal Design of Cement Mortar Pouring type Paved Track
Lee, Il-Wha ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 222~229
Recently, the development of the paved track is required as a low-maintenance of conventional line. The main reason is that the line capacity and bearing of track are increased progressively. The important factors of paved track are stability and applicability. To be based on this subject, Cement Mortar Pouring(CMP) paved track is developed. CMP paved track is a kind of ballast reinforced track using the prepacked concrete technique. The most important thing to design the paved track is to optimize the track structure considering various conditions. Because construction environment is very limited, cost is expensive and it has very complicated behavior. On this paper, structural characteristics of the paved track are investigated using the 3D finite element analysis to verify the optimized structure of the CMP track.
A Study on the Development of Panel Sensor for Obstruction Detecting at the Railway Level Crossing
Kim, Jong-Ki ; Ryu, Sang-Hwan ; Yoo, Kwang-Kiun ; Cho, Hwang ; Lee, Key-Seo ; Lee, Jae-Hoon ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 230~236
For a short-term measurement to reduce an accident on a railroad crossing, it is necessary to find out the weakness and problems of existing equipment in the railroad transportation system. The analysis of railroad crossing accidents shows that main causes of accidents (24.9%) are the careless driving including an engine problem, damage on the safety equipment, slide on the snow, and an engine stop on the railroad crossing. Therefore, it is required to install a sensor, or to make a crossing gate at the exist for detecting obstacles on a railroad to prevent collisions among trains. This paper suggests 'a panel sensor using the strain gauge' to make up the weaknesses of the sensing Dead Zone, which are caused by using a laser method, and to detect any small objects passing railroads in order to reduce the errors, which are occurred in the earth magnetic field for controlling Exit Slide Crossing Arm Detector. The device, suggested in this paper, is verified with detecting any small objects passing the railroad, with judging entry decision clearly, and with controlling passing gate and obstruction warnings/cautions obstacles at the same time, through an experimental test.
A Study on Deicing Current Estimation Technique and Configuration Process for Deicing System in the Conventional Line
Kwon, Sam-Young ; Park, Young ; Jung, Ho-Sung ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 237~243
Deicing system is to melt frost or ice freezed in catenary line when the temperature is lower than
in winter. The principle of deicing system is to melt frost or ice by Joule heat of catenary impedance. The performance of deicing is dependant of deicing current determined by the length of deicing section, deicing impedance and current division ratio of catenary line and messenger line. So, we present technique for estimating deicing current and process for determination of deicing section in the conventional line. Deicing impedance is estimated using Carson-Pollaczek equation, and current division ratio of catenary line and messenger line is estimated using voltage drop, and deicing current is estimated using power system data of deicing system. For the determination of the final deicing section, we verified estimated value comparing with experiment value of deicing impedance and current division ratio of catenary line and messenger line using low voltage experiment. Finally, we verified the validity of estimation technique and process using a simulated test data of real deicing system operation in the Chungju Substation, Chungbuk line.
Life Cycle Cost Analysis of SCP Composite Girder Bridge for Railroad
Kim, Dae-Sung ; Cho, Sun-Kyu ; Kwon, Chek ; Choi, Young-Min ;
Journal of the Korean Society for Railway, volume 9, issue 2, 2006, Pages 244~249
Recently, the SCP(Steel Confined Prestressed concrete) composite girders are developed to improve the characteristic such as displacement, vibration, and heavy dead load due to influence of self weight, and inefficiency of steel section of exiting girder-type railroad bridges. It is needed to verify the economical effciency of newly developed SCP composite girder bridge compared with the conventional girder-type bridges. In this paper, LCC analysis for alternative railroad bridges Is performed and its technique based on level of risk(probability of failure) is suggested. From the results, it may be stated that SCP composite girder bridge is more economical than a conventional one.