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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 33, Issue 6 - Nov 2013
Volume 33, Issue 5 - Sep 2013
Volume 33, Issue 4 - Jul 2013
Volume 33, Issue 3 - May 2013
Volume 33, Issue 2 - Mar 2013
Volume 33, Issue 1 - Jan 2013
Selecting the target year
Estimation of Structural Behavior of the Long Span Temporary Bridge Superstructure Stiffened by Composite Double H-beam
Lee, Seung Yong ; Park, Young Hoon ; Park, Sang Hyun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 1~11
DOI : 10.12652/Ksce.2013.33.1.001
In this study, in order to increase the span length, the temporary bridge which the center part of span is strengthened by small H-beam and the end part of span is strengthened by steel plate is designed and constructed. Real behavior of proposed temporary bridge is analyzed by field loading test. Analyzed shear buckling strengths and nonlinear behavior of suggested temporary bridge are compared with the those of general temporary bridge. From the field loading test results, it is analyzed that real static behavior of suggested temporary bridge is agree with the analyzed behavior which is considered in design process. Under the proposed design condition, it is investigated that the shear buckling strength of suggested temporary bridge is about 40% higher than that of general temporary bridge, and the ultimate strength of suggested temporary bridge is about higher than that of general temporary bridge. From the study results, it is concluded that the proposed temporary bridge can be applied by the needs of field condition.
Novel Method for Numerical Analyses of Tapered Geometrical Non-linear Beam with Three Unknown Parameters
Lee, Byoung Koo ; Oh, Sang Jin ; Lee, Tae Eun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 13~22
DOI : 10.12652/Ksce.2013.33.1.013
This paper deals with a novel method for numerical analyses of the tapered geometrical non-linear beam with three unknown parameters, subjected a floating point load. The beams with hinged-movable end constraint are chosen as the objective beam. Cross sections of the beam whose flexural rigidities are functionally varied with the axial coordinate. The first order simultaneous differential equations governing the elastica of such beam are derived on the basis of the Bernoulli-Euler beam theory. A novel numerical method for solving these equations is developed by using the iteration technique. The processes of the solution method are extensively discussed through a typical numerical example. For validating theories developed herein, laboratory scaled experiments are conducted.
Experimental Test on Coner Rigid Joint Connection Method for Underground Roadway Structure
Kim, Sung Bae ; Kim, Jang Ho Jay ; Kim, Tae Kyun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 23~34
DOI : 10.12652/Ksce.2013.33.1.023
In this study, a safe, economic, and rapid construction method of underground roadway using PSC girder is developed to reduce traffic congestion and maximize space usage in urban area. For an efficient application of the method, a rigid joint connection is proposed and tested. For the testing, cantilever specimens were used to verify its capacity. The parameters for this study were cross beam length and joint connection type. The results of the test showed that the proposed connection system has superior performances. Despite having differences of cross beam length and joint connection type, the stable flexural behavior was shown in all of the tested specimens. Also, the behaviors of PSC girders and upper slabs connected by the proposed method showed superior performance. Moreover, the improvement of structure performance according to the increase of length of cross beams has been verified.
Parametric Modeling Method for 3D Assembly Design of Parts Composing Superstructure Module on Modular Steel Bridge
Lee, Sang Ho ; An, Hyun Jung ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 35~46
DOI : 10.12652/Ksce.2013.33.1.035
A parametric modeling method, one of the core technology of BIM (Building Information Modeling), is proposed for efficient 3D assembly design among components of a superstructure module of modular steel bridge. Assembly system is classified into 3 levels as LoD (Level of Details) for 3D assembly design of the parts. Components forming 3D shape of the parts are identified and defined as parameters, variables depending on parameters, or constants independent of the parameters. Then, spatial assembly rules among the parts are defined according to the assembly system. Positional relations among the identified shape components are defined for mating spatial position and geometrical relations are defined for constraining degree of freedom on X, Y, and Z axis. Finally, a standardized template is designed by applying the rules to 3D based assembly design for the parts of the superstructure module. In addition, applicability of the parametric modeling method is demonstrated by testing the shape variation of the superstructure module according to changing the defined parameters.
Effect of the Tapered Angle on the Ultimate Load Factors of PPWS Sockets in Main Cables of Suspension Bridges
Yoo, Hoon ; Lee, Sung-Hyung ; Seo, Ju-Won ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 47~59
DOI : 10.12652/Ksce.2013.33.1.047
Ultimate load factors of PPWS(Prefabricated Parallel Wire Strand) sockets in main cables of suspension bridges are studied with respect to the tapered angles of the inner surface of sockets. After briefly reviewing the current design method, 15 numbers of finite element models of sockets are prepared by varying the number of wires in a strand and the tapered angles. The finite element models are updated by comparing experimental and numerical results, so that the models can reflect the real behavior of sockets. The stress distributions at the first yielding and ultimate states are analyzed by performing the incremental load analysis using ABAQUS. It is concluded that the optimized tapered angle of sockets should be determined at the specific angle between the results of verification equations of the required bonding length and stress resistance length.
Response Calibration for Bridges based on Statistical Quality Control Chart
Hwang, Jin Ha ; An, Seoung Su ; Kim, Ju Han ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 61~70
DOI : 10.12652/Ksce.2013.33.1.061
This paper presents the response calibration method based on quality control range, which is established from the concept and method of statistical quality control for natural frequency ratio and response ratio. To this end, statistical analysis including descriptive statistics analysis, normality test, ANOVA were performed for response characteristics obtained from loading tests and structural analysis for more than hundred and thirty well-conditioned bridges. Suggested method is based on real structural integrity evaluation case studies and statistical quality control approach, in this respect it is expected to provide scientific criteria and systematic procedure for response calibration and load carrying capacity assessment.
Buffeting Response Correction Method based on Dynamic Properties of Existing Cable-Stayed Bridge
Kim, Byeong Cheol ; Yhim, Sung Soon ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 71~80
DOI : 10.12652/Ksce.2013.33.1.071
According to design specifications for structural safety, a bridge in initial design step has been modelled to have larger self-weight, external loads and less stiffness than those of real one in service. Thereby measured buffeting responses of existing bridge show different distributions from those of the design model in design step. In order to obtain accurate buffeting responses of the in-site bridge, the analysis model needs to be modified by considering the measured natural frequencies. Until now, a Manual Tuning Method (MTM) has been widely used to obtain the Measurement-based Model(MBM) that has equal natural frequencies to the real bridge. However, since state variables can be selected randomly and its result is not apt to converge exact rapidly, MTM takes a lot of effort and elapsed time. This study presents Buffeting Response Correction Method (BRCM) to obtain more exact buffeting response above MTM. The BRCM is based on the idea the commonly used frequency domain buffeting analysis does not need all structural properties except mode shapes, natural frequencies and damping ratio. BRCM is used to improve each modal buffeting responses of the design model by substituting measured natural frequencies. The measured natural frequencies are determined from acceleration time-history in ordinary vibration of the real bridge. As illustrated examples, simple beam is applied to compare the results of BRCM with those of a assumed MBM by numerical simulation. Buffeting responses of BRCM are shown to be appropriate for those of in-site bridge and the difference is less than 3% between the responses of BRCM and MTM. Therefore, BRCM can calculate easily and conveniently the buffeting responses and improve effectively maintenance and management of in-site bridge than MTM.
Flexural Strength of HSB I-Girder Considering Inelastic Flange Local Buckling
Cho, Eun Young ; Shin, Dong Ku ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 81~92
DOI : 10.12652/Ksce.2013.33.1.081
The ultimate flexural strength of HSB I-girders, considering the effect of local bucking, was investigated through a series of nonlinear finite element analysis. The girders were selected such that the inelastic local flange buckling or the plastic yielding of compression flanges governs the flexural strength. Both homogeneous sections fabricated from HSB600 or HSB800 steel and hybrid sections with HSB800 flanges and SM570-TMC web were considered. In the FE analysis, the flanges and web were modeled using thin shell elements and initial imperfections and residual stresses were imposed on the FE model. An elasto-plastic strain hardening material was used for steels. After establishing the validity of present FE analysis by comparing FE results with test results published in the literature, the effects of initial imperfection and residual stress on the inelastic flange local buckling behavior were assessed. The ultimate flexural strengths of 60 I-girders with various compression flange slenderness were obtained by FE analysis and compared with those calculated from the KHBDC, AASHTO LRFD and Eurocode 3 provisions. Based on the comparison, the applicability of design equations in these specifications for the flexural strength of I-girder considering flange local buckling was evaluated.
Aerodynamic Forces Acting on Yi Sun-sin Bridge Girder According to Reynolds Numbers
Lee, Seung Ho ; Yoon, Ja Geol ; Kwon, Soon Duck ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 93~100
DOI : 10.12652/Ksce.2013.33.1.093
The objective of present study is to investigate the sensitivity of aerostatic force coefficients of twin box girder of Yi Sun-sin Bridge according to the Reynolds numbers. This paper presents the 1:30 scale sectional model tests conducted at high speed wind tunnel in Korea Air Force Academy. Comparison with results at low Reynolds number obtained in KOCED Wind Tunnel Center in Chonbuk National University is also provide. The Reynolds number dependency of aerodynamic force coefficients were observed at present streamlined twin box girder. The drag coefficient revealed significant decrease of nearby 23% at supercritical region. The boundary layer trip strip was found to reduce the Reynolds number dependency of aerodynamic forces by fixing the location of flow transition.
Development of Advanced Mechanical Analysis Models for the Bolted Connectors under Cyclic Loads
Hu, Jong Wan ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 101~113
DOI : 10.12652/Ksce.2013.33.1.101
This paper intends to develop mechanical analysis models that are able to predict complete nonlinear behavior in the bolted connector subjected to cyclic loads. In addition, experimental data which were obtained from loading tests performed on the T-stub connections are utilized to validate the accuracy of analytical prediction and the adequacy of numerical modeling. The behavior of connection components including tension bolt uplift, bending of the T-stub flange, stem elongation, relative slip deformation, and bolt bearing are simulated by the multi-linear stiffness models obtained from the observation of their individual force-deformation mechanisms in the connection. The component springs, which involve the stiffness properties, are implemented into the simplified joint element in order to numerically generate the behavior of full-scale connections with considerable accuracy. The analytical model predictions are evaluated against the experimental tests in terms of stiffness, strength, and deformation. Finally, it can be concluded that the mechanical models proposed in this study have the satisfactory potential to estimate stiffness response and strength capacity at failure.
Refined 3-Dimensional Strut-Tie Models for Analysis and Design of Reinforced Concrete Pile Caps
Kim, Byung Hun ; Chae, Hyun Soo ; Yun, Young Mook ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 115~130
DOI : 10.12652/Ksce.2013.33.1.115
The sectional methods of current design codes have been broadly used for the design of various kinds of reinforced concrete pile caps. Lately, the strut-tie model approach of current design codes also became one of the attracting methods for pile caps. However, since the sectional methods and the strut-tie model approach of current design codes have been established by considering the behaviors of structural concrete without D-regions and two-dimensional concrete structures with D-regions, respectively, it is inappropriate to apply the methods to the pile caps dominated by 3-dimensional structural behavior with disturbed stress regions. In this study, the refined 3-dimensional strut-tie models, which consider the strength characteristics of 3-dimensional concrete struts and nodal zones and the load-carrying capacity of concrete ties in tension regions, are proposed for the rational analysis and design of pile caps. To examine the validity of the proposed models and to verify the necessity of appropriate constituent elements for describing 3-dimensional structural behavior and load-transfer mechanism of pile caps, the ultimate strength of 78 reinforced concrete pile caps tested to failure was examined by the proposed models along with the sectional and strut-tie model methods of current design codes.
An Experimental Study of Flexural Strengthening Method of Reinforced Concrete Beams with Near Surface Mounted CFRP Strips
Lim, Dong Hwan ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 131~136
DOI : 10.12652/Ksce.2013.33.1.131
The purpose of this study is to establish the flexural strengthening method of the concrete members. To accomplish this objective, a total of seven concrete beams were tested. From this study, it is found that the initial flexural stiffness and strength of the beams reinforced with NSM CFRP strips were significantly improved compared to the beam without CFRP strip. Failure of the beam reinforced with NSM strips is initiated by failure of NSM strips, eventually sudden explosive compressive failure in the loaded region. This strengthening method combined with NSM CFRP strips and high performance mortar for concrete cover recovery is evaluated by a good strengthening method for the strength, durability and good appearance of concrete structures.
Coupling Simulation with Multi-dimensional Models for River Flow
Ahn, Jung Min ; Hur, Young Teck ; Lyu, Siwan ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 137~147
DOI : 10.12652/Ksce.2013.33.1.137
It is essential to understand the hydraulic characteristics of rivers for increasing flood-control capacity and operating hydraulic structures efficiently. Multi-dimensional models can be the proper measures to obtain the detailed information on the hydraulic characteristics of rivers. But huge amount of data and time-consuming work have been the obstacle for applying multi-dimensional models. In this study, simulation technique with multi-dimensional model(EFDC), coupled with COSFIM and FLDWAV, has been developed and applied to the real river system for verification. Developed technique can offers spatial and grid unit information as well as line and section unit information from 1-D modeling. It is considered that the coupling simulation technique can provide useful hydraulic information for river management and treatment.
Experimental Investigations on Air Entrainment Through an Air Vent Installed on a Gated Conduit of a Reservoir
Kang, Min Goo ; Park, Young Jin ; Kim, Ji Seong ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 149~155
DOI : 10.12652/Ksce.2013.33.1.149
In this study, factors that affect the air entrainment within a closed conduit by air drawn in through an air vent are investigated using a hydraulic scale model, which represents a gated circular conduit system connected to the intake tower of an irrigation reservoir. In addition, using data obtained during the hydraulic experiments, experimental equations are developed to estimate the amount of air drawn in through the air vent. In case of pressurized flow conditions downstream of hydraulic jumps, the relationships between
of the data form a experimental equation,
; in case of free surface flow conditions,
. Comparing two data sets observed under the two flow regimes with the results of previous researchers, patterns of the data sets are similar to the results estimated using the equations presented previously, and this indicates that the quality of the data obtained during the hydraulic experiments is ensured. In addition, it is revealed that air entrainment phenomena in the regions close to air vents are affected by the characteristics of supercritical flows downstream of gates. Finally, it is concluded that the equation developed for pressurized flow conditions can be applied to design of air vents.
A Study on Proper Number of Subbasin Division for Runoff Analysis Using Clark and ModClark Methodsdd in Midsize Basins
Lee, Donghoon ; Choi, Jongin ; Shin, Soohoon ; Yi, Jaeeung ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 157~170
DOI : 10.12652/Ksce.2013.33.1.157
In this study, flood runoff characteristics is analyzed according to subbasin divisions by physically based rainfall-runoff model and appropriate number of subbasin divisions is suggested for midsize test basins. The Clark method, a lumped model in HEC-HMS, and the ModClark method, a semi-distributed model are used to simulate rainfall-runoff processes on Andong-reservoir basin, Imha-reservoir basin, and Pyeongchang river basin. The test basins were divided into nine subdivision cases by equal-area subdivision method such as single basin, 3, 5, 6, 7, 9, 10, 12, and 15 subbasins, and compared the simulated and observed values in terms of the peak flow and the peak time. The simulation results indicated that the peak flows tended to increase and the peak time shifted earlier as the number of subdivisions increased and this tendency weakened after the certain number of subdivisions. In this research, the specific number of subdivision was defined as the minimum number of subdivision considering both peak flow and peak time. Consequently, the minimum number of subdivisions is determined as 5 for Andong and Imha reservoir basins and 7 for Pyeongchang river basin.
Analysis of Debris Flow Type in Gangwon Province by Database Construction
Jun, Kyoung-Jea ; Kim, Gi-hong ; Yune, Chan-Young ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 171~179
DOI : 10.12652/Ksce.2013.33.1.171
In recent years in Korea, Typhoon Rusa (2002), Typhoon Maemi (2003), and the localized extreme rainfall followed by Typhoon Ewiniar in 2006 devastated residential areas, roads, and agricultural lands in Gangwon province where 90% of the area is in mountainous regions. Most of the economic losses and casualties were concentrated in the area near the mountain valleys and creeks due to the floods and debris flows. In this study, DATABASE, which includes a total 180 debris flow events in the Gangwon area, was created by collecting the hazard records and field investigations of existing debris flow sites. Analysis results showed that the most of the debris flows in Gangwon province initiated from the small slope failure with relatively steep slope of
. And they flowed short distances about 420 m in gentle slope with the average angle of
. In addition, rainfall condition was important for the triggering of debris flow not only at the day of debris flow but also extended period of rainfall before debris flow.
Ring-shear Apparatus for Estimating the Mobility of Debris Flow and Its Application
Jeong, Sueng-Won ; Fukuoka, Hiroshi ; Song, Young-Suk ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 181~194
DOI : 10.12652/Ksce.2013.33.1.181
Landslides are known as gravitational mass movements that can carry the flow materials ranging in size from clay to boulders. The various types of landslides are differentiated by rate and depositional features. Indeed, flow characteristics are observed from very slow-moving landslides (e.g., mud slide and mud flow) to very fast-moving landslides (e.g., debris avalanches and debris flows). From a geomechanical point of view, shear-rate-dependent shear strength should be examined in landslides. This paper presents the design of advanced ring-shear apparatus to measure the undrained shear strength of debris flow materials in Korea. As updated from conventional ring-shear apparatus, this apparatus can evaluate the shear strength under different conditions of saturation, drainage and consolidation. We also briefly discussed on the ring shear apparatus for enforcing sealing and rotation control. For the materials with sands and gravels, an undrained ring-shear test was carried out simulating the undrained loading process that takes place in the pre-existing slip surface. We have observed typical evolution of shear strength that found in the literature. This paper presents the research background and expected results from the ring-shear apparatus. At high shear speed, a temporary liquefaction and grain-crushing occurred in the sliding zone may take an important role in the long-runout landslide motion. Strength in rheology can be also determined in post-failure dynamics using ring-shear apparatus and be utilized in debris flow mobility.
A Study on the Influence Range of Lateral Movement of Abutment on the Soft Clay by MCC Model
Park, Choon Sik ; Kim, Jong Hwan ; Baek, Jin Sool ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 195~205
DOI : 10.12652/Ksce.2013.33.1.195
This study, using the MCC Model to consider consolidation, estimated the range within which no influences occur from lateral movement and its amount of the foundation pile and abutment on the soft ground. This study performed finite element analyses, with variations on the adhesiveness and internal friction angle, depth of soft clay, embankment height, consolidation parameters, and separation distance between the abutment and embankment. The abutment's horizontal displacement exhibits linear change with a longer separation distance, and changes into an exponential form as the embankment gets closer to the abutment. As the soft clay layer becomes 10 m deeper, the horizontal displacement tends to increase 1.5~3.0 times. However, it decreases at a rate of 0.3~0.95 when adhesiveness is increased by 10
and internal friction angle is increased by
. The increase change rate in a lateral movement amount becomes greater if it is closer to the abutment when the abutment separation distance is long. When the distance is short, the change rate of horizontal displacement increases in similar a way, but it tends to be decreasing overall.
Short-Array Beamforming Technique for the Investigation of Shear-Wave Velocity at Large Rockfill Dams
Joh, Sung-Ho ; Norfarah, Nadia Ismail ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 207~218
DOI : 10.12652/Ksce.2013.33.1.207
One of the input parameters in the evaluation of seismic performance of rockfill dams is shear-wave velocity of rock debris and clay core. Reliable evaluation of shear-wave velocity by surface-wave methods requires overcoming the problems of rock-debris discontinuity, material inhomogeneity and sloping boundary. In this paper, for the shear-wave velocity investigation of rockfill dams, SBF (Short-Array Beamforming) technique was proposed using the principles of conventional beamforming technique and adopted to solve limitations of the conventional surface-wave techniques. SBF technique utilizes a 3- to 9-m long measurement array and a far-field source, which allowed the technique to eliminate problems of near-field effects and investigate local anomalies. This paper describes the procedure to investigate shear-wave velocity profile of rockfill dams by SBF technique and IRF (Impulse-response filtration) technique with accuracy and reliability. Validity of the proposed SBF technique was verified by comparisons with downhole tests and CapSASW (Common-Array-Profiling Spectral-Analysis-of-Surface-Waves) tests at a railroad embankment compacted with rock debris.
Finite Element Analysis for Transmission Tower Behavior Characteristic by Connection Beam Stiffness
Choi, YoungHo ; Kyung, DooHyun ; Lee, JunHwan ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 219~227
DOI : 10.12652/Ksce.2013.33.1.219
This study analyzed the effect of performance connected-type foundations of behavior and the connected beams according to the characteristics into soft clay transmission tower foundation. For this purpose, the finite element analysis model was built and connected to the transmission tower foundation mat and the contact area of the connection beam by the percentage change in the behavior and resistance characteristics were analyzed and finite element verification of the validity of the analytical model was conducted using connected-type transmission tower results of the model experiments constructed, and effective connected-type transmission tower basis of the behavior of connected beams were selected by analyzing the effect due to the increase of the stiffness. In addition, weak analysis by connected beam self-bending moment distribution was conducted.
Study on Numerical Analysis of Estimating Elastic Modulus in Rockmass with a Consideration of Rock and Joint Characteristcs
Son, Moorak ; Lee, Wonki ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 229~239
DOI : 10.12652/Ksce.2013.33.1.229
Elastic modulus in rockmass is an important factor to represent the characteristic of rock deformation and is frequently used to estimate the displacement induced due to tunnel excavation or other activities in rockmass. Nevertheless, the study to estimate the elastic modulus, which considers the rock type and joint characteristics (joint shear strength and joint inclination angle), has been done in less frequency. Accordingly, this study is aimed at estimating of elastic modulus in jointed rockmass. For this purpose, numerical parametric studies have been carried out with a consideration of rock and joint conditions. Tunnel displacement results have been used to estimate the elastic modulus of jointed rockmass using the elastic theory of circular tunnel. From this study, the results would be expected to have a great practical use for estimating the displacement induced due to tunnel excavation or other activities in jointed rockmass.
Analysis of Traffic Characteristics for the Transportation Vulnerable
Jung, Hun Young ; Lee, Sang Yong ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 241~249
DOI : 10.12652/Ksce.2013.33.1.241
Since the enactment of "Mobility Promotion Law for Transportation Vulnerable", each municipality has been various efforts to improve the transportation vulnerable's the right of movement. However, the effectiveness of mobility promotion policy for the transportation vulnerable is awfully inadequate because circumstances which associated with operation of transportation of the handicapped such as local conditions and transport characteristics have not been considered. Thus, in this study investigated traffic characteristics of the transportation vulnerable through the data of regional slope, non-step buses and handicap vehicles operating conditions and so on in Busan Metropolitan. Also, we proposed to introduction of the 'mobility index' which is based on local condition analysis of Busan. And we suggested that how to improve the convenience of transportation vulnerable's movement.
School Zone Safety Improvement Using Smart Bollard
Kim, Hoe Kyoung ; Lim, Jae Moon ; Sul, Jae Hoon ; Oh, Yun Pyo ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 251~259
DOI : 10.12652/Ksce.2013.33.1.251
This paper is aimed to introduce to a moving bollard (i.e., smart bollard) to improve the pedestrian safety along the crosswalk in the school zone as a means to physically separate pedestrians and approaching vehicles, to propose the appropriate criteria for its installation and implementation from the traffic engineering perspective, and to evaluate its effectiveness with the microscopic simulation model. The simulation results indicate that implementing the smart bollard results in the decrease of average approaching speed and traffic throughput and the most critical factors affecting its effectiveness are yellow time of the traffic signal directly associated with the location of the advance warning sign and its operation time, 5~6 seconds and 2~3 seconds, respectively.
A Study on the Improving the Services for Users of LRT (Light Rail Transit) by Structural Equation Model - Focus on Busan Gimhae Light Rail Transit and Busan Subway Line 4(Bansong Route) -
Jang, Seok Yong ; Jung, Hun Young ; Baik, Sang Keun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 261~272
DOI : 10.12652/Ksce.2013.33.1.261
LRT(Light Rail Transit), which has many merits compared with Heavy Rail Transit, is an effective public transport. Therefore, many local governments are pushing ahead with LRT. Busan had already adopted LRT(AGT)s like Busan Subway Line 4(Bansong Route) and Busan Gimhae Light Rail Transit(BGLRT) domestically for the first time. This study analyzes user satisfaction about the services of adopted LRTs and set right priorities of remeding their shortcomings from the user's perspective. In this paper, we surveyed safety consciousness and services satisfaction of LRT(BGLRT) users, and made two User Satisfaction Models of each LRT(BGLRT and Bansong Route) using Structural Equation Model. With established User Satisfaction Models(BGLRT Model and Bansong Route Model), we compared BGLRT and Bansong Route. Finally we found the measures and priorities for the improvements of LRT's services in the aspect of LRT users.
A Study on the Construction for Transfer System between Tram and Public Traffic System - In the Place of Changwon Area -
Choi, Yang-Won ; Park, Do-Yun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 273~286
DOI : 10.12652/Ksce.2013.33.1.273
Recently, due to problems with subway and bus operations, a need has emerged for a solution such as the introduction of an Advanced Transit System. In several municipalities, systems have been introduced using light rail as AGT urban aesthetics construction. There is high inhibition and civil cases are delayed by more environmentally friendly and accessible remedies. For the purpose of this study, Changwon city would be transformed to have an environmentally friendly transportation system such as a tram with an overview. Features, advantages, and disadvantages are analyzed, and systems are established the existing public transport routes by transfer system. Changwon city's tram plan is first step in open in year 2018, and second step with the opening goal of the year 2021, and the total line length of 33.9 km, the station will be built in the 38 locations. and also in 2011 a feasibility study, evaluated a low economic as B/C to 0.88, but it evaluated the high value of the policy analysis as AHP to 0.502. However, introduction of a tram project that should precede the as following condition. The first step in Changwon city's tram plan would be as follows : The introduction of the tram system would demand traffic management along with a restructuring of the bus system, and the tram system would be selected for domestic realities. Secondly, the introduction of trams would comprehend the advanced traffic composition in accordance with the consensus of the citizenship, and a legal system should be established for the introduction of the trams.
Development of Advanced Gravity Model Using Accordance Rate Of Observed O-D Value and Derived O-D Value from Gravity Model
Ryu, Yeong-Geun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 287~295
DOI : 10.12652/Ksce.2013.33.1.287
This paper developed advanced gravity model for higher estimation accuracy, that deals with residuals. Previously studied paper using gravity model's residual, residual calculated that observed O-D value minus derived O-D value from gravity model, and this residual added to the target year's estimated value from gravity model. In this paper, residuals calculated on gravity model parameter estimation process, and this residual is revealed the same value that observed O-D value devided by derived O-D value from gravity model. And case study resulted that developed new gravity model that applied accordance rate of observed O-D value and derived O-D value from gravity model has higher estimation accuracy than other gravity models as basic gravity model and residual plused gravity model.
Region-wide Road Transport CO
Shin, Yong Eun ; Ko, Kwang Hyee ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 297~304
DOI : 10.12652/Ksce.2013.33.1.297
Due to its excessive
emissions, road transport sector becomes a target for emission reduction strategies. Although precise and reliable emissions inventories are necessary for evaluating plans and strategies, developing the region-wide inventory is a difficult task mainly because of a lack of data including travel patterns and modal volumes in the reginonal context. Most existing inventory methodologies employ fuel sale data within the target region, which ignores actual regional traffic patterns and thus not suited to its geographical context. To overcome these problems, this study develops region-wide
emissions inventory methodology by utilizing the Korea Transport DB (KTDB). KTDB provides a number of useful information and data, such as road network with which one can identify in and out trips over the entire region, traffic volumes of various modes, distance of travel, travel speed and so on. A model of equations that allow the computation of volume of
emitting from the road transport activities within the target region is developed. Using the model, numerical analyses are performed for the case of Busan Metropolitan City to demonstrate the applicability of the developed model. This study is indeed exploratory in the sense that using the existing data, it develops the
emissions inventory methodology which can produce better results than those from conventional fuel sales methodology. This study also suggests further reresarch directions to develop more refined methodologies in region-wide basis.
An Analysis of Velocity Patterns and Improvement Effect after Application of Domestic Roundabout Design Guidelines (Focusing on Busan Metropolitan City)
Lim, Chang-Sik ; Choi, Yang-Won ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 305~316
DOI : 10.12652/Ksce.2013.33.1.305
To find out if modern roundabout is still effective under drivers behavior and driving conditions in Busan Metropolitan City, the effects before and after introduction of roundabout were analyzed. According to analysis on velocity profile at roundabout, velocity deviation decreased, and average vehicle speed was close to design speed. As a result, it has been confirmed that most roundabouts were properly built. In terms of traffic operation, average vehicle speed improved by 87.2% when a traffic intersection was replaced by a roundabout. therefore, it has been found out that the introduction of roundabout has a positive effect on increasing vehicle speed by reducing traffic congestion. In addition, annual benefits expected from the replacement from a traffic intersection to a roundabout were KRW 872 million as follows; KRW 410 million in traffic communication, KRW 39 million in transportation safety, KRW 255 million in energy saving, KRW 95 million in reduction of air pollution and KRW 73 million in reduction of traffic signal installation cost. In other words, if 10% (193 spots) of all traffic intersections (1,926 spots in total) in Busan City are replaced by roundabouts, the municipal authority would be able to save about KRW 168.3 billion. According to analysis on the benefits expected from the installation of roundabouts compared to the investment cost for traffic intersections, about KRW 679 million could be saved per roundabout. Considering 10% of all traffic intersections in the City of Busan, about KRW 131 billion could be saved annually. The traffic accidents in roundabout usually occur because drivers aren't aware of right-of-way rules. Once the right-of-way rules settle, the number of traffic accidents would significantly decrease. In addition, it is urgent to promote education and campaign for drivers, pedestrians and bikers on the roundabout.
Properties of Temperature Reduction of Cooling Asphalt Pavements Using High-Reflectivity Paints
Hong, Chang Woo ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 317~327
DOI : 10.12652/Ksce.2013.33.1.317
Air pollution and artificial heat of urban areas have caused the urban heat island in which asphalt pavements absorb solar heat during the daytime and release the heat at night. Hence, in order to improve the environment of urban areas, it is necessary to examine cooling pavements that can reduce heat on road pavements in urban areas. The application of temperature insulation paints on road pavements require to reduce black brightness for visibility, to increase the reflection rate of infrared light and minimize the reflection rate of visible light. In the study, one part of Acrylic-emulsion was used as a main binder, and the changes in black brightness and the changes of addition ratio (0%, 15%, 30%) of hollow ceramics, as well as kinds of paints (carbon black pigment, mixed mineral pigment) were selected as the main experimental factors. The performance of temperature reduction of cooling pavements was analyzed through the reflection rate of spectrum, the reflection rate of solar heat, and the lamp test. Abrasion resistance, UV accelerated weather resistance, and sliding resistance were tested in real situations. In addition, the performance of heat reduction of testing pavements covered with high-reflection paints was analyzed by using an infrared camera. As the test results, when using mixed mineral paints and hollow ceramic of 30%, the reflection rate of spectrum was 43% in the area of near-infrared ray and 17% in the area of visible light at black brightness of
=42.89 and the reflection rate of solar heat was 27.5%. Total color difference was
=0.27 in the test of UV Accelerated Weather Resistance, indicating almost no changes in color. BPN was more than 53 when scattering #2 and #4 silica sand of more than
. In Taber's abrasion resistance test, abrasion loss was up to 86.4mg at 500 rotations. The performance of heat reduction was evaluated using an infrared camera at the test section applying high-reflection paints to asphalt pavements, in which the results showed that the temperature was reduced by
on CI-30-40 cooling pavements (
=38.76) and by
on CI-30-60 cooling pavements (
Temperature Sensitivity Analysis of TDR Moisture Content Sensor for Road Pavement
Cho, Myunghwan ; Lee, Yoonhan ; Kim, Nakseok ; Jee, Keehwan ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 329~336
DOI : 10.12652/Ksce.2013.33.1.329
The infrastructure of flexible pavement is composed of aggregate subbase, anti-frost layer, and subgrade. In particular, the subgrade performance is affected by climates such as frost action and precipitation. The method of TDR(Time Domain Reflectometry) sensors to measure moisture contents in subgrade layer has been used in the research. Due to the TDR method using dielectric permitivity of soil and water, the sensors can be affected by the low subgrade temperatures. The air temperatures frequently drops below
in the winter in Korea. As a result, it is necessary to estimate the accuracy of the TDR moisture sensors in the range of below zero temperatures. In this study, the subgrade temperatures of lower than
were extended to evaluate temperature sensitivity of the TDR moisture sensors. The test results revealed that the moisture contents around the sensors were reduced while those of the upper part of specimen showed a tendency to increase as the specimen surface temperature drops below zero under the volumetric moisture contents(VMC) of 20% and 30%. However, the impact of temperature on the function of the sensor at lower water contents was found to be negligible if any.
A Study on an Optimal Plant Design Collaboration System Using a Design Structure Matrix
Yun, Jong Yi ; Kim, Jeong Hwan ; Kang, Sang Hyeok ; Seo, Jong Won ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 337~346
DOI : 10.12652/Ksce.2013.33.1.337
A design collaboration system for a plant project is a set of complicated multidisciplinary processes in which a large number of various engineering fields are involved. Each subsystem is related to each other as they depend on information that other subsystems create, which leads to inefficient design iterations. This study presents an optimal design collaboration system for a plant project using Design Structure Matrix (DSM). Data regarding design subsystems, parameters, etc. were obtained by expert surveys and workshops. An automatic analysis program for DSM was developed using Visual Basic Application and Matlab to provide a partitioned DSM. A case study was conducted on a furnace project; consequently, the optimal design collaboration system with five crucial iteration groups was derived.
Strategies for Balancing the Competitiveness between Engineering and Construction in the Korean Infrastructure Industry
Lee, Kang Wook ; Han, Seung Heon ; Park, Hyung Keun ; Chin, Kyung Ho ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 347~354
DOI : 10.12652/Ksce.2013.33.1.347
In the recent global construction environment, EPC contracts that integrate planning, design, procurement, and construction have been widely used for industrial facilities. Similarly, as the importance of the engineering capability such as project management consulting(PMC) and front end engineering design(FEED) has been increased, design-build contracts also have been gradually adopted for infrastructure projects. Whereas, the Korean infrastructure industry has fragmentary features which mainly emphasize on the construction sector. Therefore, this study aims at developing strategies for enhancing the engineering capability and for balancing the competitiveness between engineering and construction sectors in the Korean infrastructure industry. To this end, the authors first carried out market analysis for both global and domestic market. Then, a structured survey and expert in-depth interviews were sequentially performed in order to reflect practitioners' perspectives and needs for institutional strategies. As a result, five strategies drawn from this study are as follows: 1) rearranging the government's roles for supporting the engineering sector; 2) establishing institutional bases being compatible with global standards; 3) fostering value-added workforce for undertaking complex tasks; 4) constructing an consortium between an engineering association and general contractors; and 5) building a nationwide collaborative networks for overseas market expansion.
A Competitiveness Study Using IPA for Vietnamese Infrastructure Market
Jang, Hyoun-Seung ; Yu, Jung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 355~362
DOI : 10.12652/Ksce.2013.33.1.355
Korean construction companies has maintained stable market share based on high technology and cost competitiveness although international construction market has been stalled due to increasingly global economy uncertainties. In order to promote the continuous growth and development of overseas construction, Korean construction companies need to secure overseas market information, and to be strongly competitive. Therefore, this study aims to analysis of competitiveness for international construction by business types, in order to enter the Vietnamese infrastructure market, which presents abundant development potential. According to the IPA results, Korean construction industry has weaknesses in its ability to obtain business information and experience, which are the most important factors in entering the overseas construction market, and also presents a lack of feasibility study for creating new construction business. However, this work is still considered to provide the basic data that can help Korean construction companies who plan to enter the Vietnamese infrastructure market strengthen their medium and long-term capabilities.
Development of the Local Area Design Module for Planning Automated Excavator Work at Operation Level
Lee, Seung-Soo ; Jang, Jun-Hyun ; Yoon, Cha-Woong ; Seo, Jong-Won ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 363~375
DOI : 10.12652/Ksce.2013.33.1.363
Today, a shortage of the skilled operator has been intensified gradually and the necessity of an earthwork in extreme environment operators are difficult to access is increasing for the purpose of resource development and new living space creation. For this reason, an effort to develop an unmanned excavation robot for fully automated earthwork system is continuing globally. In Korea, a research consortium called 'Intelligent Excavation System' has been formed since 2006 as a part of Construction Technology Innovation Program of Ministry of Land, Transport and Maritime Affairs of Korea. Among detailed technologies of the Task Planning System is one of the core technologies of IES, this paper explains research and development process of the Local Area Design Module, which provides informatization unit to create automated excavators' work command information at operation level such as location, range, target, and sequence for excavation work. Designing of Local Area should be considered various influential factors such as excavator's specification, working mechanism, heuristics, and structural stability to create work plan guaranteed safety and effectiveness. For this research, conceptual and detail design of the Local Area is performed for analyzing design element and variable, and quantization method of design specification corresponding with heuristics and structural safety is generated. Finally, module is developed through constructed algorithm and developed module is verified.
A Study on Measures to Improve the System to Control the Heights of Apartments in Coastal Areas Considering City Scenery - For Apartments in Coast Region in Busan Metropolitan City -
Kim, Jong Gu ; Kim, Yu Jun ;
Journal of The Korean Society of Civil Engineers, volume 33, issue 1, 2013, Pages 377~386
DOI : 10.12652/Ksce.2013.33.1.377
As apartments have been made into high-rise buildings, the residents in the buildings have become to enjoy the benefits. On the contrary, the users of buildings on the back have become to experience many problems in residential environments. This research studied on measures to improve height control systems focusing on the heights of apartments in order to figure out the impact of apartments on city scenery. This study concluded that, to solve these problems, a general system to control heights should be prepared to solve the problem of visual blocking and for apartment complexes or buildings in coastal areas, regulations for height controls suitable to them should be separately prepared thereby controlling systems related to height controls as a whole instead of those many different systems relating to heights.