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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 34, Issue 6 - Dec 2014
Volume 34, Issue 5 - Oct 2014
Volume 34, Issue 4 - Aug 2014
Volume 34, Issue 3 - Jun 2014
Volume 34, Issue 2 - Apr 2014
Volume 34, Issue 1 - Feb 2014
Selecting the target year
Measurement and Proposed Design Specification of Temperature Distribution in the Concrete Pylon
Hwang, Eui-Seung ; Shim, Jae-Soo ; Kim, Do-Young ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 1~8
DOI : 10.12652/Ksce.2014.34.1.0001
This paper deals with monitoring and analysis of temperature measurement data in concrete pylon of long span cable bridges. During the construction of Geoga Bridge in Busan-Geoje Fixed Link Project, temperature sensors were installed in several sections of hollow box type concrete pylon and temperatures along the depth of the four sides of the section have been recorded along with ambient temperature. Effects of temperature distribution on the pylon are analysed using actual measured data and results are compared with the design guideline. It was found that the temperature load model for concrete girder can be applied to box type concrete pylon. Structural analysis of the pylon due to variation of temperature distribution during the construction is performed using 3D modelling and FE program and the maximum displacements of east-west and north-south side were calculated as 0.056m and 0.121m, respectively.
Dynamic Response Analysis of Pipe Subjected to Underwater Explosion
Kim, Seongbeom ; Lee, Kyungjae ; Jung, Dongho ; Park, Taehyo ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 9~16
DOI : 10.12652/Ksce.2014.34.1.0009
In recent years, the structural shock response to UNDEX (UNDerwater EXplosion) has been studied as much, or more, through numerical simulations than through testing for several reasons. Very high costs and sensitive environmental concerns have kept destructive underwater explosion testing to a minimum. Increase of simulation capabilities and sophisticated simulation tools has made numerical simulations more efficient analysis methods as well as more reliable testing aids. In this study, the main issue is the fluid-structure interaction. Here, appropriate relations between the acoustic pressure on the fluid surface and displacements on the structure surface are formed internally. The analysis was carried out using ABAQUS/Explicit and the results have been visualized in ABAQUS CAE. The shock loading history, acoustic pressure, stress of stand-off point, the velocity and strain energy time histories were presented.
Numerical Model Updating Based on Univariate Search Method for High Speed Railway Bridges
Park, Dong-Uk ; Kim, Nam-Sik ; Kim, Sung-Il ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 17~27
DOI : 10.12652/Ksce.2014.34.1.0017
Numerical model became one of most important tools for identifying the state of an existing structure in accordance with development of numerical analysis techniques. A numerical model should be updated based on the measured responses from the existing structure to accurately use the model for identifying the state of the bridge and executing numerical experiments. In this study, a new model updating method based on repetition method without a differential function is introduced and applicability for high speed railway bridge is verified with dynamic stability analysis. A fine measurement based on measurement points roaming method was executed with an wireless measurement system for precise dynamic characteristic analysis. The natural frequencies and mode shapes were estimated by correlation analysis and a mode decomposition technique. An initial numerical model was constructed based on design drawings and the model have been updated in accordance with the introduced model updating method. The results from numerical experiment and field test have been compared for verifying the applicability of the model updating method. And the dynamic stability analysis has been executed to verify the usability of the updated numerical model and the model updating method. It seems that the model updating method can be used for various bridges after evaluation of applicability for other type bridges in further studies.
Structural Performance of Precast Concrete Arch with Reinforced Joint
Chung, Chulhun ; Joo, Sanghoon ; Choi, Dongchan ; Lee, Jongyun ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 29~47
DOI : 10.12652/Ksce.2014.34.1.0029
The masonry stone arch bridge, due to its superior durability and aesthetics, has been one of the oldest and popular types of short span bridges. In Europe, this type of bridges have been continuously constructed, and numerous related researches have been conducted until recently. However, there are few construction cases in Korea since the economic efficiency and the construction effectiveness is not contentable. Therefore, this study proposed the reinforced joint to improve structural performance of the conventional arch systems which is proposed by previous researchers. The structural performance of the proposed reinforced joint, which consists of the transverse loop joint and the longitudinal reinforcement, is validated by experimental test of an arch bridge which is constructed using precast concrete segments. Based on this results of the experimental test, it is concluded that the strength of arch bridges can be enhanced by applying the proposed reinforced joints since the reinforced joint restrains hinge behavior and relative displacement between segments with a little reinforcement.
Effects of Flexural Rigidity of Center Tower in Four-Span Suspension Bridges
Gwon, Sun-Gil ; Yoo, Hoon ; Choi, Dong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 49~60
DOI : 10.12652/Ksce.2014.34.1.0049
For simple and accurate analysis for behaviors of multi-span suspension bridges which are expected to be frequently constructed as strait-crossing bridges, the deflection theory as the peculiar theory of a suspension bridge can be applied. This paper performs a structural analysis for four-span suspension bridges using the deflection theory. Simply-supported beams with tension are used for girders and the deflections of the beams due to the vertical loads and moments at supports are calculated. The calculation is performed iteratively until the deflections satisfy the compatibility equations of cables. The results of the deflection theory analysis considering tower rigidity are compared with those of the finite element analysis for verification. Importance of the tower rigidity for four-span suspension bridges is confirmed using various compatibility equations of the cable due to variation of the constraint conditions between main cable and top of towers. In addition, the simple parametric analysis for variation of the center tower rigidity is performed.
Free Vibration Analysis based on HSDT of Laminated Composite Plate Structures Using Multi-scale Approach
Lee, Sang-Youl ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 61~71
DOI : 10.12652/Ksce.2014.34.1.0061
This study carried out finite element vibration analysis of composite plate structures for construction using multi-scale approaches, which is based on the higher-order theory. The finite element (FE) models for composite structures using multi-scale approaches described in this paper is attractive not only because it shows excellent accuracy in analysis but also it shows the effect of the material combination. The FE model is used for studying free vibrations of laminated composite plates for various fiber-volume fractions. In particular, new results reported in this paper are focused on the significant effects of the fiber-volume fraction for various parameters, such as fiber angles, layup sequences, and length-thickness ratios. It may be concluded from this study that the combination effect of fiber and matrix, largely governing the dynamic characteristics of composite structures, should not be neglected and thus the optimal combination could be used to design such civil structures for better dynamic performance.
Seismic Performance of Column-Footing Connection of Modular Pier using CFT
Kim, Ji Young ; Kim, Ki Doo ; Ma, Hyang Wook ; Chung, Chul-Hun ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 73~85
DOI : 10.12652/Ksce.2014.34.1.0073
The CFT (Concrete Filled steel Tubes) column-footing connection is cast-in-place embedded type which provides simple construction procedure, low cost, and superior structural performance. In this study, CFT column-footing connection of modular pier is proposed and structural performance is evaluated by experimental tests. To evaluate structural performance of the CFT column-footing connection, a series of experimental tests were performed for the 4 specimens with different embedded depth. As a result of the quasi-static test, the specimen with 0.6D (0.6 times the outside diameter of steel tube) embedded depth showed relatively low ductility than other specimens with larger embedded depth due to cone failure of base concrete occurred during the lower loading step. On the contrary, cone failure of the base concrete was not observed in the specimens with larger embedded depth than 0.9D, but typical flexural failure in lower part of CFT column was observed. With the analyses of force-displacement curve, displacement ductility, and energy dissipation capacity, it is concluded that the rational range of embedded depth of the CFT column-footing connection is from 0.9D to 1.2D in view of good seismic performance.
Characteristics of Bond Behavior According to Confinement and Stiffness Ratios of External Confining Jackets
Choi, Eunsoo ; Jung, Chunsung ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 87~94
DOI : 10.12652/Ksce.2014.34.1.0087
This study analyzes the characteristics of bond behavior of concrete, which is confined by external jackets such as shape memory alloy (SMA) and steel, according to confinement and stiffness ratios of the external jackets. For this purpose, SMA wires with 1.0 mm diameter and steel plates with 1.0 and 1.5 thickness are used to induce difference on confinement and stiffness ratios and, then, bond strength and behavior are analyzed considering the two factors. When external jakcets are used for the concrete cylinders, bond strengths of specimens increase and their bond failures are transferred from splitting failure to pull-out failure and, thus, the external jackets show confining effect. Bond strenght of concrete increase with increasing confinement and stiffness ratios of the external jackets. However, maximal circumferential strains decrease linearly with increasing the two values.
Fire Resistance Performance of Precast Segmental Concrete Lining for Shield Tunnel
Han, Byung-Chan ; Harada, kazunori ; Kwon, Young-Jin ; Kim, Yun Yong ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 95~105
DOI : 10.12652/Ksce.2014.34.1.0095
Reinforced concrete (RC) shield tunnel lining must be designed for fireproof performance because the lining is sometimes exposed to very high temperature due to traffic accidents. Both experimental and numerical studies are carried out to evaluate fire resistance performance of precast RC tunnel lining systems. In the experimental studies, six full-scale precast RC tunnel segments are exposed to fire in order to examine the influence of various parameters on the fire resistance performance of precast RC tunnel lining. We used the temperature curve of the RABT criteria, which are severe conditions of fire temperatures. The fire test showed that the explosive spalling was not observed by substituting concrete to PP fiber reinforced concrete. A transient heat flow analysis was carried out in consideration of the material properties that change with temperature, and the results showed good agreement with the test results.
An Estimation of Roughness Coefficient in a Channel with Roughness Correction Blocks
Choi, Heung Sik ; Kim, Si Hoon ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 107~116
DOI : 10.12652/Ksce.2014.34.1.0107
A volume density of roughness correction blocks in a channel is defined and the corresponding roughness coefficient(n) is estimated by analyzing the diverse hydraulic characteristics of VR, the product of the average velocity and the hydraulic radius, block Reynolds number (
), drag coefficient (
), and the roughness coefficient (
) of bottom shear. The increase of VR and block Reynolds number causes the exponential decrease of roughness coefficient converged to a constant value as expected. The drag coefficient also exponentially decreases as block Reynolds number increases as well. The drag force is governed by the block shape defined by volume density in high block Reynolds number of turbulent flow region. For more accurate estimation of roughness coefficient the use of the correlation equation of it is required by block Reynolds number and volume density. The regression equations for n-VR,
are presented. The regression equations of roughness coefficient are also presented by block Reynolds number and volume density. The developed equation of roughness coefficient by block Reynolds number and volume density has practical use by confirming the coincidence between the experimental results and the results of HEC-RAS using the developed equation.
The Recent Increasing Trends of Exceedance Rainfall Thresholds over the Korean Major Cities
Yoon, Sun-Kwon ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 117~133
DOI : 10.12652/Ksce.2014.34.1.0117
In this study, we analysed impacts of the recent increasing trend of exceedance rainfall thresholds for separation of data set and different research periods using Quantile Regression (QR) approach. And also we performed significant test for time series data using linear regression, Mann-Kendall test and Sen test over the Korean major 8-city. Spring and summer precipitation was tend to significant increase, fall and winter precipitation was tend to decrease, and heavy rainy days in last 30 years have increased from 3.1 to 15 percent average. In addition, according to the annual ranking of rainfall occurs Top
percentile of precipitation for 3IQR (inter quartile range) of the increasing trend, most of the precipitation at the point of increasing trend was confirmed. Quantile 90% percentile of the average rainfall 43.5mm, the increasing trend 0.1412mm/yr, Quantile 99% percentile of the average rainfall 68.0mm, the increasing trend in the 0.1314mm/yr were analyzed. The results can be used to analyze the recent increasing trend for the annual maximum value series information and the threshold extreme hydrologic information. And also can be used as a basis data for hydraulic structures design on reflect recent changes in climate characteristics.
A Study on Typhoon Impacts in the Nakdong River Basin Associated with Decaying Phases of Central-Pacific El Niño
Kim, Jong-Suk ; Son, Chan-Young ; Lee, Joo-Heon ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 135~143
DOI : 10.12652/Ksce.2014.34.1.0135
This study classified abnormal sea surface temperature changes of the central pacific region according to three evolution patterns. Focusing on typhoons that affect the Korean Peninsula, the research analyzed typhoon`s occurrence spot and track, change in the central pressure characteristics, and the characteristics of change in typhoon precipitation and the number of occurrences of heavy rainfall in the Nakdong River Basin. As a result of analysis, in case of prolonged-decaying years and symmetric-decaying years, typhoon-related summer rainfall and heavy rainy days appeared to be higher than long-term average. But in case of abrupt-decaying years, the pattern of general decrease appeared. This is because typhoon`s occurrence spot is located comparatively near the Korean peninsula, typhoon`s central pressure is high, and typhoon`s route generally moves to Japan. As the outcome, this study is expected to reduce flood damage through analyzing the characteristics of typhoon`s activity according to CP El Ni
o evolution patterns and the characteristics of local typhoon rainfall. In addition, it is expected to provide useful information for establishing adaptation and mitigation to climate change.
Probabilistic Assessment of Drought Characteristics based on Homogeneous Hidden Markov Model
Yoo, Ji-Young ; Kwon, Hyun-Han ; Kim, Tae-Woong ; Lee, Seung-Oh ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 145~153
DOI : 10.12652/Ksce.2014.34.1.0145
Several studies regarding drought indices and criteria have been widely studied in the literature. If one defines the onset, severity, and end of droughts, in general, a certain threshold needs to be set to assess the drought events. However, the uncertainty associated with the threshold is a critical problem in drought analysis. To take full advantage of the inherent features in the rainfall series, a Hidden Markov Model (HMM) based probabilistic drought analysis was proposed rather than using the existing threshold based analysis. As a result, the proposed HMM based probabilistic drought analysis scheme shows better performance in terms of defining drought state and understanding underlying characteristics of the drought. In addition, the HMM based approach is capable of quantifying the uncertainties associated with the classifying meteorological drought condition in a systematic way.
Eco-river Restoration and River Management in Response to Climate Change
Kang, Hyeongsik ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 155~165
DOI : 10.12652/Ksce.2014.34.1.0155
In this study, using a complex of physical, chemical, and biological evaluation factors, the ecological vulnerability to climate change were evaluated at each river in the Nakdong river basin. First, runoff, sediment rate, and low flow discharge changes according to AIB climate change scenario using the SWAT model were simulated. Also, for the assessment of chemical and biological factors, 48 points that water quality monitoring sites and ecological health measurement points are matched with each other was selected. The water quality data of BOD and T-P and the biological data of IBI and KSI in each point were reflected in the assessment. Also, the future rise in water temperature of the rivers in Nakdong river basin was predicted, and the impact of water temperature rise on the fish habitat was evaluated. The top 10 most vulnerable points was presented through a summary of each evaluation factor. This study has a contribution to river restoration or management plan according to the characteristics of each river.
Study on Pullout Behavior of Embedded Suction Anchors in Sand using ALE (Arbitrary Lagrangian Eulerian) Technique
Na, Seon Hong ; Jang, In Sung ; Kwon, O Soon ; Lee, Seung Hyun ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 167~173
DOI : 10.12652/Ksce.2014.34.1.0167
The embedded suction anchor, ESA, is one type of mooring anchor systems which utilizes the suction pile or caisson to penetrate the anchor into the sea bed and develops its capacity under pullout load. In this study, the numerical analysis using ALE (Arbitrary Lagrangian Eulerian) Adaptive Meshing technique was performed to simulate the pullout behavior of the ESA, and the results were compared to those of the previous research, centrifuge model tests and the analytical method based on limit equilibrium theory. The pullout behaviors of the ESA under horizontal, vertical, and inclined loading were evaluated. The analysis results showed that the maximum horizontal pullout load was developed when the location of loading point was at the mid-point, and the each vertical pullout load gave the similar value regardless of the locations of the loading points. The pullout load decreased as the load inclination angle increased at the mid-point of the anchor.
Response Analysis of Block-Bearing Structure due to Tunnel Excavation in Clay Ground
Son, Moorak ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 175~183
DOI : 10.12652/Ksce.2014.34.1.0175
This study investigates the response of structures to tunnelling-induced ground movements in clay ground, varying tunnel excavation condition (tunnel depth and diameter), tunnel construction condition (ground loss), and tunnel ground condition (soft clay and stiff clay). Four-story block-bearing structures have been used because the structures can easily be characterized of the extent of damages with crack size and distribution. Numerical parametric studies have been used to investigate of the response of structures to varying tunnelling conditions. Numerical analysis has been conducted using Discrete Element Method (DEM) to have real cracks when the shear and tensile stress exceed the maximum shear and tensile strength. The results of structure responses from various parametric studies have been integrated to consider tunnel excavation condition, tunnel construction condition, and tunnel ground condition and provide a relationship chart among them. Using the chart, the response of structures to tunnelling can easily be evaluated in practice in clay ground.
A Methodology Development for Estimating the Retroreflectivity of Pavement Markings and Traffic Guide Signs Using Digital Images
Choi, Keechoo ; Lee, Seunghyeon ; Yun, Ilsoo ; Yi, Yongju ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 185~194
DOI : 10.12652/Ksce.2014.34.1.0185
This study investigates the methodology to evaluate the quantified performance of pavement markings and traffic guide signs using digital images. This methodology is significant to attempt to quantify their performance without large brightness photometer at the nighttime and bad weather. The retroreflective performance of pavement markings are evaluated through the contrast of gray levels of pavements and markings in collected digital images under the case of rain, dampness, and dryness. In addition, the appraisal of retroreflective performance of traffic guide signs are implemented through the comparison between interior illuminated and the existing retroreflective traffic guide signs using the contrast of luminance extracted from the value of RGB of backgrounds and legends in collected digital images according to geometric design, driving lanes, and the distance between the car and the sign. As a result, the retroreflective performance of pavement markings deteriorates about 3.5 times and 2 times under the case of rain and dampness respectively than dryness. Also, the performance of the existing traffic guide signs is significantly influenced by geometric design, driving lanes, and the distance, otherwise interior illuminated traffic guide signs. This methodology can be utilized to construct objective information of performance of traffic safety facilities to select appropriate position of expensive high reflective pavement markings and interior illuminated traffic guide signs considering diverse weather and geometric design.
The Development of a Railway Safety Maturity Model and Estimate Procedures
Lim, Kwang-Kyun ; Yeum, Diogjong ; Kim, Sigon ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 195~202
DOI : 10.12652/Ksce.2014.34.1.0195
The newly updated Rail Safety Act is required to build a comprehensive railway safety management system with corresponding accreditation regulations for the purpose of safe railway operations. However, such efforts would not be enough to achieve a successful safety-performance solely without being in place of an appropriate level of safety cultures in an organization. No research was taken place to propose a safety culture maturity model and its estimate procedures in Korean railway industries. The research reviews a variety of safety maturity models applied in many other industries and the process of conducting surveys in order to propose a framework of railway safety maturity estimates, with a set of railway safety elements. This research is expected to contribute in diagnosing weak areas and finding their appropriate treatment, along with in placing the railway safety certificate program from 2014.
Suggestion on the Optimal Length of Long Tunnels Considering Traffic Safety Characteristics
Kim, Joong-Hyo ; Lee, Jeong-Hwan ; Kwon, Sung Dae ; Ha, Dong Ik ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 203~211
DOI : 10.12652/Ksce.2014.34.1.0203
Tunnel reduces travel time as and it is essential facilities for the eco-friendly road construction. In recent years, It has been accelerating the tunnel construction to provide a higher level of traffic service but a driver driving in the narrow and dark tunnel takes characteristically psychological anxiety and the restriction of the sight. Moreover, A driver passing through more than 1,000m long tunnel, as to pass inside the monotonous form of the tunnel for a long time can cause drowsiness and increase the driver load. This driver load can degrade road-holding of the inside of the long tunnel highly and pose a high risk of accidents. Accordingly, In this study is to present the proper length of the Tunnel, considering the characteristics of traffic accident. For this, this study is that the long tunnel that affects traffic safety traffic safety variables are selected and classified. Traffic safety variables are classified in detail as a variable of the traffic accident and velocity one, the applicable variables the number of the traffic accident, the ratio of the traffic accident, driving velocity, the individual vehicle velocity etc. Traffic safety variables are categorized as more than a pole length of the tunnel in order to examine its impact on correlation analysis. The results indicate significant results in traffic accidents in accordance with traffic accidents, traffic safety, selects the variable was Variable depending on the length of the tunnel traffic safety point of significantly increasing the possibility of an accident can be seen as a high point. And the point of the Distribution of selected variables in order to create a traffic safety was a significant increase in traffic safety variables was set at critical intervals. Before reaching the critical point and the corresponding length of the long tunnel was set at the proper length. In this study, the optimum length of the proposed long tunnel through the long tunnel that occur in the future to contribute to reducing traffic accidents would be able to be determined.
Travel Patterns of Disabled Persons Using Special Transport Systems : Case of Gyeongsangnam-do
Shin, Yong-Eun ; Choi, Hye-Mi ; Song, Ki-Wook ; Lee, Hee-Dae ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 213~221
DOI : 10.12652/Ksce.2014.34.1.0213
Since 2005, when "The Mobility Enhancement for the Mobility Impaired Act" was enacted, special transport systems(SPS) has been introduced by each responsible local entity. For its efficient operations and service enhancements, a clear understanding of travel patterns of SPS users is required. Yet we currently have a very limited understanding about them due to a lack of necessary data. This study represents an attempt to provide a better understanding of SPS user`s travel patterns with the data generated by Gyeongsangnam-do SPS Call Center. The data include the number, time and day of calls, origins and destinations of callers, types of callers` impairement etc. The data thus allow one to analyze users` travel patterns, including area-wide O-D patterns. There were a number of interesting findings. For example, wheelchair users are only about 42% and the trips are made mostly on non-peak daytime periods. The results are expected to provide a helpful information not just for Center`s SPS operations, but for other local entities that are interested in developing similar call centers as well. By refining the SPS system, periodic patterns of callers could be identified in the future.
Driving Satisfaction and Safety Assessment for Roundabout
Namgung, Moon ; Shin, Hoe Sik ; Jang, Tae Youn ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 223~233
DOI : 10.12652/Ksce.2014.34.1.0223
This study empirically analyzes the relationships among the road and traffic experts` personal characteristics, the driving behavior and factors being expected to have an effect on the satisfaction about roundabout operation. The factors are drawn and grouped through the principle component analysis to clarify driving environment satisfaction on roundabout operation. Each group is named as personal attribute, driving behavior attribute, and satisfaction. After the variables are refined by confirmatory factor analysis, satisfaction model is developed with personal attribute and driving behavior attributes as exogenous variables and roundabout driving awareness and emotion attributes as endogenous variables. As a result, driving satisfaction of roundabout operation is directly influenced by delay reduction, safety improvement, capacity increase, sight improvement, severity accident reduction, and bicycle convenience and indirectly gender, age, driving time, and driving experience. Law obeyance, driving concession, traffic sign obeyance, and interposition do not statistically shows significant on satisfaction. As a result of Analytical Hierarchy Process (AHP), the turning radius of geometry and the driving behavior are important elements for roundabout safety.
A Study on the Reduction of Traffic Induced Contributions through Installing a Parking Guidance System
Choi, Yang-Won ; Cho, Hyun-Seog ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 235~241
DOI : 10.12652/Ksce.2014.34.1.0235
There are many traffic problems in a city such as parking, traffic jam caused by traffic induction facility. Therefore it is essential to demand for traffic demand management to building`s owner whose building location causes traffic induction. According to the 90s traffic policy, government collects fee for traffic induction facility through traffic policy management and they encourage the building owner to join reduction of traffic jam program by reduction of traffic induction fee. However there are not many buildings owner joined this program because the program is not ghat beneficial. For example, if government set out parking guidance system (part of parking demanding system) in a city, it will reduce to 20% of traffic induced contributions but t can be used only once a year, so it is not efficient to used even it is valuable for about 10 years. In particular, according to the economic efficiency analysis, evaluate economically as net present value (NPV) to 2,160.44 million won, ratio of benefit/cost (B / C) to 2.44 during 10 years. Therefore this research will find out what is necessary for parking guidance system.
Development and Evaluation of Smart Roundabout Using Connected Vehicle
Kim, Hoe Kyoung ; Lee, Young Bin ; Yoon, Chil Yong ; Oh, Yun Pyo ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 243~250
DOI : 10.12652/Ksce.2014.34.1.0243
Modern roundabouts referred to as relatively safer and more efficient traffic facility than the signalized intersections have been recently deployed and operated and accordingly more research efforts to improve its safety and efficiency have been made so far. This paper introduces a new traffic information system named as Smart Roundabout coupled with Connected Vehicle technique like Vehicle-to-Roadside communication, which has not been attempted before and evaluates its performance with a microscopic simulation model, VISSIM. The proposed system functions to collect driving information of circulating vehicles in the roundabout such as location, speed, critical headway, etc. and help approaching vehicles decide whether to enter the roundabout with an on-board equipment instrumented in the individual vehicle on the basis of calculated gap acceptance of interest. This new system is expected to secure more safety and increase the capacity of the modern roundabout.
Performance Evaluation of Quasi-Public Bus System: Publicness and Efficiency - Case: Busan -
Shin, Yong Eun ; Jeong, Ji Woo ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 251~259
DOI : 10.12652/Ksce.2014.34.1.0251
Securing publicness and efficiencies are the two core goals for implementing quasi-public bus system. However, researches for evaluating the quasi-public bus system with respect to the two goals have been very limited. This study represents an attempt to evaluate the system performance in these two aspects. To achieve this, a framework for performance evaluation is developed. Utilizing the framework, the 5-year performances of the quasi-public bus system in Busan are evaluated. Acess, agency and public interests are employed as criteria for publicness evaluation. Financial aspects of operators, labor, vehicle utilization, productivity and operational costs are selected as indicators for efficiency evaluation. The results show that the publicness of bus services has been vastly improved, while the efficiency has been also improved in most areas except in cost and vehicle utilization aspects. The results of this study will be of use for planners and policy-makers developing strategies for system improvement. It is hoped that this study can be further refined by adding and adjusting indicators which this study may neglect or ignore.
Development of Maintenance Prototype for Dam Facilities Using NFC Technology
An, Ji-Won ; Park, Jin-Hong ; Jang, Won-Suk ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 261~271
DOI : 10.12652/Ksce.2014.34.1.0261
Construction industry becomes large and complicated as that occurred in the construction processes and operations, and the growing social demand for more systematic and efficient methods of integrated management increases. Current facility maintenance system has been regarded as large labor-intensive and fairly stagnant, and faced on several issues including inefficiency in cost and time to collect and utilize various field information. Thus, this paper presents a maintenance prototype utilizing NFC technology and smart devices to efficiently collect and manage the field information in the course of the construction processes. By choosing dam facilities as a case study, construction data for dam inspection and maintenance were classified according to dam maintenance guideline, and database structure was constructed to incorporate with the NFC tags and smart device interface. The system prototype presented in this paper would improve the quality of the dam facilities maintenance system and provide business convenience and usability by contributing increased efficiency of field information management and sharing.
A Study on the Feasibility of COBie to the Wastewater Treatment Plant
Choi, Jae-Ho ; Um, Dong-Yong ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 273~283
DOI : 10.12652/Ksce.2014.34.1.0273
With the introduction of COBie (Construction Operation Building Exchange) in BIM technology enabling an automatic transfer of design and construction information to operation and management (O&M) phase, the BIM centric O&M management system development process has been tested on the subject of architectural types of building. However, for now, there is a need to investigate the technical feasibility of COBie application to civil structures including industrial facilities. This study takes both "O&M Guideline for Public Wastewater Treatment Plant" and a real wastewater treatment plant into account for the purpose, in which the latter is intended to supplement the result of the first. The findings are three-folds: (1) COBie, as an asset modeling, is not sufficient enough to encompass commissioning data, (2) more relevant IFC development and family library build-up useful to modeling wastewater treatment plant is imperative, and (3) well-planned coordination and organization of COBie data-set in line with O&M practice will enhance the feasibility of the COBie in industrial facilities. The result could be used for a basis study for COBie application, particularly in industrial facilities.
A Feasibility Study to Adopt BIM-based Infrastructure Management System
Kim, Jeonghwan ; Ji, Seung-Gu ; Jeong, Taehyung ; Seo, Jongwon ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 285~292
DOI : 10.12652/Ksce.2014.34.1.0285
BIM (Building Information Modeling) is a new paradigm that includes construction life-cycle, and BIM has become mandatory regulation according to the Public Procurement Service since 2016, which accelerates its application. BIM is now expand from architectural field to infrastructure industry. Through pilot projects, BIM has been challenged with verification process. This trend has affected to maintenance and operation (M&O) phase of construction life-cycle. Advanced country has already published their research and result with feasibility study and guidelines. In this paper, we conduct the feasibility study to adopt BIM-based infrastructure management system. Bridges and tunnels were selected as application target, and benefit/cost ratio were used. The result shows that BIM-based infrastructure management system is feasible when the level of detail is more than "Medium" in bridge, and "High" in tunnel.
A Compensation Method and Comparative Analysis of Historical Unit Price Considering Work Types for Large and Small-Scale Projects
Hong, Sung Ho ; Lee, Dong Wook ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 293~303
DOI : 10.12652/Ksce.2014.34.1.0293
Recent historical unit price is presented by the Korea Institute of Construction Technology (KICT) and it is analyzed by data from large-scale projects. Therefore it has problem applying to small-scale projects. To indicate the problem, the study compared historical unit price of large-case project and small-case project in the case of civil engineering work, building construction, and mechanical facility work. As a result, average historical unit price of small-scale project was 26.6% higher than large-scale project. On the other hand, difference on the labor cost was 18.4%, difference on material cost and overheads were 8.18%. Moreover, the study proposed compensation method to correct to apply recent historical unit price to small-scale project.
A SWOT based ANP Application for Strategy Development to enter Overseas Water Market
Choi, Jae-Ho ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 305~316
DOI : 10.12652/Ksce.2014.34.1.0305
The current global water market has been reshaped with a few multinational water companies, water-specialized companies, and other non-construction companies such as manufacturing and financial companies. Each has different business objectives along with the value chain of water industry. In this context, a SWOT-ANP model is proposed to prioritize strategic alternatives for a non-construction company in Korea and the result is validated through a comparison with the AHP model and real business strategies of the company examined from the recent news reports. The validation was confirmed that the company`s strategies are very much similar to the priority list and the rankings of the strategic alternatives are identical with those from AHP model, while the weights are slightly changed from the weights in AHP result.
The Strategies of Railway Facility Charging Toward A Railway Competitive Market
Kim, Sigon ; Lim, Kwang-Kyun ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 317~327
DOI : 10.12652/Ksce.2014.34.1.0317
This study focuses on developing railway facility charging scheme and more understanding of its corresponding regulations, which is to be utilized as a principal guideline toward a railway competitive market in future. European countries where railway competition is already in place have referred as case studies. The study first defined what the railway facility charges are based upon a spatial concept, railway networks with links and nodes. There are two types of charging: first is on railway tracks which are identical to links, and another at stations which are identical to nodes, such that the railway facility charges become a summation of track charges and station charges covering all the railway networks. Next, we have identified what the objectives of imposing track and station charges are, including factors being able to reflect each objective. 6 objectives are proposed as for the track charges, and 3 objectives as for the station charges. The factors found are accordingly belonged to the objectives. In the end, relevant regulations are compared with the European regime to diagnose what further requirements or/and principals have to be guided into them. In summary, both charging scheme and the direction of regulation updates can be utilized in setting an appropriate charging scheme and corresponding regulations to ensure fair competitions.
Marketing Strategies for the Korean High Speed Electric Multiple Unit (HEMU train)
Kim, Yeon Kyu ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 329~332
DOI : 10.12652/Ksce.2014.34.1.0329
The Korean High Speed Electric Multiple Unit (HEMU) train system is soon being applicable to practical use. This new technology is expected not only to reshape the domestic market but also to be exported to overseas markets for high-speed train system. This study aims to prospect demands on the HEMU train technology and to formulate marketing strategies using a text-mining technique, therefore, providing a foundation for successful commercialization of the HEMU train system.
Preference Analysis for the Pedestrian Space in Large-scale Residential Complex by Multi Dimensional Scaling -Focused on the Haeundae New town in Busan-
Kim, Yu Jun ; Kang, Youn Won ; Kim, Jong Gu ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 333~340
DOI : 10.12652/Ksce.2014.34.1.0333
We analyzed pedestrian preference and features of preferential space by MDS (Multi Dimensional Scaling). As the result, features of pedestrian space in dimension 1 could be interpreted as "Segregation of Pedestrian and Vehicle", and features of pedestrian space in dimension 2 could be read like "Natural-City". And as a result of vector analysis about preferential of pedestrian, a pedestrian mall between housing complex, pedestrian space in pocket park, pedestrian space in neighborhood park, and pedestrian space around public facilities was the best preferential space. On the other hand, pedestrians tended to dislike pedestrian space between detached.
An Instantaneous Integer Ambiguity Resolution for GPS Real-Time Structure Monitoring
Lee, Hungkyu ;
Journal of The Korean Society of Civil Engineers, volume 34, issue 1, 2014, Pages 341~353
DOI : 10.12652/Ksce.2014.34.1.0341
In order to deliver a centimeter-level kinematic positioning solution with GPS carrier-phase measurements, it is prerequisite to use correctly resolved integer ambiguities. Based on the mathematical modeling of GPS network with application of its geometrical constraints, this research has investigated an instantaneous ambiguity resolution procedure for the so-called `integer constrained least-squares` technique which can be effectively implemented in real-time structure monitoring. In this process, algorithms of quality control for the float solutions and hypothesis tests using the constrained baseline for the ambiguity validation are included to enhance reliability of the solutions. The proposed procedure has been implemented by MATLAB, the language of technical computing, and processed field trial data obtained at a cable-stayed bridge to access its real-world applicability. The results are summarized in terms of ambiguity successful rates, impact of the stochastical models, and computation time to demonstrate performance of the instantaneous ambiguity resolution proposed.