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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 35, Issue 6 - Dec 2015
Volume 35, Issue 5 - Oct 2015
Volume 35, Issue 4 - Aug 2015
Volume 35, Issue 3 - Jun 2015
Volume 35, Issue 2 - Apr 2015
Volume 35, Issue 1 - Feb 2015
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An Experimental Study for Flexural Failure Behavior of Composite Beam with Cast-in-place High Strength Concrete and GFRP Plank Using As a Permanent Formwork and Tensile Reinforcement
Um, Chan Hee ; Yoo, Seung Woon ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1015~1024
DOI : 10.12652/Ksce.2015.35.5.1015
An experiment of composite beam was performed which utilized glass fiber reinforced polymer (GFRP) plank as the permanent formwork with cast-in-place high strength concrete. This research analyzed the flexural failure behavior of composite beam by setting the sand coated at GFRP bottom surface, the perforation and interval of the GFRP plank web, and the width of the top flange as the experimental variables. As a result of the experiments for effectiveness of sand attachment in case of not perforated web, approximately 43% higher ultimate load value was obtained when the sand was coated than not coated case. For effectiveness of perforation and interval of gap, approximately 23% higher maximum load value was seen when interval of the perforation gap was 3 times and the fine aggregate was not coated, and approximately 11% higher value was observed when the perforation gap was 5 times on the coated specimen. For effectiveness of top flange breadth, the ultimate load value was approximately 12% higher in case of 20mm than 40mm width.
Seismic Behavior and Estimation for Base Isolator Bearings with Self-centering and Reinforcing Systems
Hu, Jong Wan ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1025~1037
DOI : 10.12652/Ksce.2015.35.5.1025
Flexible base isolation bearings that separate superstructure from ground have been widely used in the construction field because they make a significant contribution to increasing the fundamental period of the structure, thereby decreasing response acceleration transmitted into the superstructure. However, the established bearing devices installed to uphold the whole building give rise to some problems involved with failure and collapse due to lack of the capacity as modern structures are getting more massive and higher. Therefore, this study suggests new isolation bearings assembled with additional restrainers enabled to reinforcing and recentering, and then evaluates their performance to withstand the seismic load. The superelastic shape memory alloy (SMA) bars are installed into the conventional lead-rubber bearing (LRB) devices in order to provide recentering forces. These new systems are modeled as component spring models for the purpose of conducting nonlinear dynamic analyses with near fault ground motion data. The LRB devices with steel bars are also designed and analyzed to compare their responses with those of new systems. After numerical analyses, ultimate strength, maximum displacement, permanent deformation, and recentering ratio are compared to each model with an aim to investigate which base isolation models are superior. It can be shown that LRB models with superelastic SMA bars are superior to other models compared to each other in terms of seismic resistance and recentering effect.
Flood Inflow Estimation at Large Multipurpose Dam using Distributed Model with Measured Flow Boundary Condition at Direct Upstream Channels
Hong, Sug-Hyeon ; Kang, Boosik ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1039~1049
DOI : 10.12652/Ksce.2015.35.5.1039
The inflow estimation at large multipurpose dam reservoir is carried out by considering the water balance among the discharge, the storage change during unit time interval obtained from the observed water level near dam structure and area-volume curve. This method can be ideal for level pool reservoir but include potential errors when the inflow is influenced by the water level slope due to backwater effects from upstream flood inflows and strong wind induced by typhoon. In addition, the other uncertainties arisen from the storage reduction due to sedimentation after the dam construction and water level noise due to mechanical vibration transmitted from the electric power generator. These uncertainties impedes the accurate hydraulic inflow measurement requiring exquisite hydrometric data arrangement for reservoir waterbody. In this study, the distributed hydrologic model using UBC-3P boundary setting was applied and its feasibility was evaluated. Finally, the modeling performance has been verified since the calculated determination coefficient has been in between 0.96 to 0.99 after comparing with observed peak inflow and total inflow at Namgang dam reservoir.
Empirical Formula for Wave Runup of Rubble-Mound Structure Covered by Tetrapods: Effects of Front Slope and Armour Layer Thickness
Lee, Jong-In ; Bae, Il-Ro ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1051~1059
DOI : 10.12652/Ksce.2015.35.5.1051
Wave runup is one of the most important factors affecting the design of coastal structure exposed to wave attack. In this study, two dimensional laboratory tests were conducted under the different random wave conditions and structure configurations to develop a formula to predict runup heights. Rubble-mound structure consisted of tetrapod armour blocks with 1:1.5 and 1:2 slopes. The relative water depths (the ratio of the significant wave height to water depth at the toe) ranged from 0.14 to 0.56. The formula proposed here is applicable to surf similarity parameter ranging from 2 to 6. Runup heights on 1:2 slope were higher than those on 1:1.5 slope. Runup heights were reduced by 5% when the armour layer thickness increased two times.
Derivation and Application of Boussinesq Equations for the Wave Field in Porous Media
Chun, Insik ; Min, Yongchim ; Lim, Hak-Soo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1061~1071
DOI : 10.12652/Ksce.2015.35.5.1061
In the present study, the Navier-Stokes (N-S) equations delineating water flows inside porous media were derived applying Reynolds transport theorem in order to provide a basis for analyzing water wave problems inside the porous media. Then, the derived N-S equations were compared with the same species of equations in existing researches. Based on the N-S equations, a set of Boussinesq equations was then derived in such a form that the dispersiveness and nonlinearity of water waves inside the porous media can be properly reproduced. Finally, numerical analyses were carried out to demonstrate the validity of the equations. The reflection and transmission coefficients of porous breakwaters were calculated and compared with the results of existing hydraulic experiments. The numerical results showed a rather sensitive dependency on the virtual mass coefficient of grains constituting the porous media. The selection of the coefficient with zero turned out to give nice agreements with numerical and experimental results.
Influence of Antecedent Rainfall in Stability Analysis of Unsaturated Soil Slope
Lee, Yeongsaeng ; Yoon, Seunghyun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1073~1082
DOI : 10.12652/Ksce.2015.35.5.1073
The behavior of the unsaturated soil slope can be influenced by the various factors such as the hydraulic characteristics, the mechanical characteristics, the coefficient of conductivity, the stratifications, the rainfall conditions i.e. the rainfall intensity, the rainfall pattern, the duration time of the rainfall and the antecedent rainfall etc. It is known that the slope failure is influenced greatly by the antecedent rainfall rather than the rainfall condition at the failure time, so the antecedent rainfall is supposed to be a very important factor in slope stability analysis among these factors. To predict and to prevent the slope failure by the rainfall, the distribution of the matric suction by the antecedent rainfall must be considered first of all and the slope stability analysis should be carried out by considering the successive rainfall characteristics. In this research, 3 samples with different quantity (5%, 10%, 20%) of silts were prepared and the SWCC (Soil-water characteristic curve) tests were carried out and the associated parameters were analyzed. After analyzing the distribution of the matric suction and the change of the mechanical characteristics such as the stress and the strength when applying the antecedent rainfall for one month and the successive intensive rainfall for 12 hours, the slope stability analyses were carried out numerically. And the influence of the antecedent rainfall for one month and the SWCC on the stability of a slope were compared and analyzed.
Experiment Study on Mixing Efficiency of Material for Improving Reclamation Soil Quality in Dredging Soil Pipeline using CFD
Park, Byongjun ; Kang, Byungyoon ; Chung, Minchul ; Shin, Jaeryul ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1083~1096
DOI : 10.12652/Ksce.2015.35.5.1083
This study utilised Computational Fluid Dynamics(CFD) for preliminary assessment of mixing efficiencies of 2-phase fluids in a pipe at which a slurry flow and an injected solidifier join, for the purposes of reducing trial-and-error-based instances of physical experiments and conducting the overall research in an economical way. Using OpenFOAM
, we simulated behavior of 3-phase fluids under 18 different settings generated by changing diameters of a dredged soil transportation pipe, a quality improving material injection pipe and the confluence angle. While difference in mixing efficiencies amongst the instances was insignificant, discernible boundary layers amongst the materials were observed in all of the instances. In order to break the boundary layers, we designed a substructure inside a pipe and found out that it could remarkably improve mixing efficiencies particularly for short distance applications.
Identifying Universal Design Factors for Reducing and Preventing Negligent Accidents in Urban Railway Station
Kwon, Youngjong ; Kim, Sigon ; Kim, Hwangbae ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1097~1102
DOI : 10.12652/Ksce.2015.35.5.1097
Negligent accidents in urban railway station not only give damages to users but also cause avoidance of public transport usage. This study aims to identify design factors in designing urban railway station for reducing and preventing negligent accidents in the station. Especially this study identifies design factors from the perspectives of universal design concept which is for all persons. This study classified negligent accidents in urban railway stations, analysed degree of danger and identified the causes of accidents. Then this study identified universal design factors based on the results of analysis on the priority of accident factors relating to negligent accidents. The results of this study can be utilized as basic data in designing urban railway station for reducing and preventing negligent accident in urban railway station.
Comparative Study on the Departure Area for a Day`s Tour Trip in Due Consideration of the Circular Trip among Tourist Attractions - Focused on Geoje-si Tourist before and after the Opening of BG Fixed Link -
Song, Ki-Wook ; Jung, Hun-Young ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1103~1110
DOI : 10.12652/Ksce.2015.35.5.1103
Ratio of a day`s tour for Geoje-si, 22.6 percent, has increased to 48.6 percent since the opening of Busan-Geoje fixed link. Eight cities of Yeungnam area including Busan-Ulsan and Daegu-Gyeongbuk has been directly affected by the changed route from GJ Bridge to BG Bridge. In order to compare the range of departure area for a one-day trip in Geoje tourist attractions before and after the new fixed link, duration variation of visitors is described as individual difference by normal distribution function. One-day tour trip model based on a circular trip is also suggested under comparatively simple supposition. Since average area after the opening is equal to maximum area before as minimum area after is equal to average area before, the effect of access improvement by the new bridge is revealed definitely. In addition, the effect of cities located in the middle and long distance is greater. Although cities proximity to Geoje are not influenced significantly, every citizen is capable of taking a one-day trip anywhere.
A Proposal of Two Signals Roundabout Analysis Method Using SIDRA6
An, Hong Ki ; Yue, Weng Long ; Kim, Dong Sun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1111~1121
DOI : 10.12652/Ksce.2015.35.5.1111
Roundabouts face a congestion problem when there are unbalanced traffic conditions, especially during peak times. The congestion at roundabouts results in long delay times and low level of service. Some research has addressed congestion problems of the metering roundabout, however, few studies have focused on the congestion issues of the double signals metering roundabout. This research bridges this gap through analyzing the congestion issues of the Old Belair double signals roundabout in Adelaide. The research proposes a new analysis method based on a four-nodes intersection in order for double signals roundabout analysis to be carried out as follows: firstly, at the modeling stage, a connection of four individual intersections, adjustment of lane geometry, input of directional traffic volumes, priority and phase time set up are proposed. Secondly, for calibration, PFF, critical gap, follow-up headway and extra bunching values have been applied. The results from the analysis show that the new method is able to analyze the delay time, level of service, degree of saturation and allow for further analysis.
Evaluation of Mobile Emissions Reduction Strategies Using Travel Demand Model and Analytic Hierarchy Process
Lee, Kyu Jin ; Park, Kwan Hwee ; Shim, Sang Woo ; Choi, Keechoo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1123~1133
DOI : 10.12652/Ksce.2015.35.5.1123
This study proposed an evaluation method of mobile emissions reduction strategies for air quality management. The proposed method was considered Travel Demand Model (TDM) and Analytic Hierarchy Process (AHP), while an existing method was focused on quantitative factors. AHP of the evaluation indices of mobile emissions reduction strategies show that quantitative evaluation indices such as air pollutants and greenhouse gas reduction are more important than the political evaluation indices (Consistency with an upper plan, Policy applicability, Technical applicability and feasibility) and each weight of air pollutants and greenhouse gas reduction are found to be 0.373 and 0.218. The early scrapping policy of decrepit diesel vehicle is the best policy in the proposal method using TDM and AHP but this result differs from evaluated result by TDM or AHP respectively. These results are limited to the basic assumption and range of reduction scenarios but are expected to contribute to establish more reasonable and effective mobile emission reduction strategies.
Development of Bicycle Accident Prediction Model and Suggestion of Countermeasures on Bicycle Accidents
Kwon, Sung-Dae ; Kim, Yoon-Mi ; Kim, Jae-Gon ; Ha, Tae-Jun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1135~1146
DOI : 10.12652/Ksce.2015.35.5.1135
This thesis aims to improve the safety of bicycle traffic for activating the use of bicycle, main means of non-powered and non-carbon transportation in order to cope with worldwide crisis such as climate change and energy depletion and to implement sustainable traffic system. In this regard, I analyzed the problem of bicycle roads currently installed and operated, and developed the bicycle accident forecasting model. Following are the processes for this. First, this study presented the current status of bicycle road in Korea as well as accident data, collect the data on bicycle traffic accidents generated throughout the country for recent 3 years (2009~2011) and analyzed the features of bicycle traffic accidents based on the data. Second, this study selected the variable affecting the number of bicycle accidents through accident feature analysis of bicycle accidents at Jeollanam-do, and developed accident forecast model using the multiple regression analysis of `SPSS Statistics 21`. At this time, the number of accidents due to extension per road types (crossing, crosswalk, other single road) was used. To verify the accident forecast model deduced, this study used the data on bicycle accident generated in Gwangju, 2011, and compared the prediction value with actual number of accidents. As a result, it was found out that reliability of accident forecast model was secured through reconciling with actual number of cases except certain data. Third, this study carried out field survey on the bicycle road as well as questionnaire on satisfaction of bicycle road and use of bicycle for analysis of bicycle road problems, and presented safety improvement measures for the problems deduced as well as bicycle activation plans. This study is considered to serve as the fundamental data for planning and reorganizing of bicycle road in the future, and expected to improve safety of bicycle users and to promote activation of bicycle use as the means of transportation.
An Analysis of Perceptions by Road Construction Engineers on ICEC Framework at the Time of System Transition, from Responsibility Supervision to Construction Management(I) - Main Focus on ICEC Framework -
Park, Hyo-Sung ; Kim, Nak-Seok ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1147~1156
DOI : 10.12652/Ksce.2015.35.5.1147
The result of responsibility supervision system which has been enforced for the last twenty (20) years since January, 1994 is evaluated, and keeps an eye out the process of unification and absorption of the system into the construction management (CM). As a baseline data for this study, the grade framework of construction engineer`s ICEC introduced with CM is summarized. In this manuscript, the questionaire survey for CM and ICEC was conducted toward the target group of road field construction engineers and analyzed the outcome of the respondents` answers. 50% of the respondents have answered positively for the question about converting responsibility supervision to CM. 48% of the respondents from construction works field have answered positively for converting responsibility supervision system to CM while 38% of the respondents from engineers of supervision field have answered positively, less positive than the answers from works field engineers. 46% of overall respondents have answered, however, to maintain the present system of 40%, 40% and 20% on the survey to the question asking the opinion on the ways of calculating ICEC to use the rates : 40% of career, 40% of qualification and 20% of academic achievements. However, it appeared that engineers who have comparative advantages with academic achievements and career, and engineers with lower grade qualification demanded higher rate for career.
Agent-Based Evacuation Simulations of Road Tunnels in the Event of a Fire
Kim, Byungil ; Kim, Changyoon ; Kim, Du Yon ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1157~1163
DOI : 10.12652/Ksce.2015.35.5.1157
The purpose of this study is to reveal the effects of the number of users and their spatial distribution on the evacuation time in a road tunnel in the event of a fire. An agent-based evacuation model was implemented using Netlogo following the ODD protocol. The proposed model illustrates how the evacuation behavior of one can hinder others across different evacuation environments. Simulations show that evacuation time increases with the number of users when they are randomly located in a road tunnel.
Road O&M Cost Prediction Model with the Integration of the Impacts of Climate Change using Binomial Tree Model
Kim, Du Yon ; Kim, Byungil ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1165~1171
DOI : 10.12652/Ksce.2015.35.5.1165
Due to the increasing trend of operation and maintenance cost (O&M cost) of infrastructure, the accurate estimation of O&M cost is crucial part to the government. Recent literatures pointed out that gradual climate changes such as average temperature changes, average precipitation changes, and etc. have significant impact on infrastructure O&M cost. This research is intended to develop a long-term O&M cost prediction model of road facilities by considering the impacts of average temperature changes. For this end, the climate change scenarios of Intergovernmental Panel on Climate Change (IPCC)`s
report are adopted to structure the impact of average temperature changes by using binomial lattice model. The proposed framework is expected to regional government in supporting decisions for road O&M cost.
Classification and Standardized Coding for Urban Railway Casuality Accident Types and Causes
Mo, Chun Suk ; Kim, Si Gon ; Kwon, Young Jong ; Kang, Kap Seang ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1173~1177
DOI : 10.12652/Ksce.2015.35.5.1173
The paper suggests to reclassify the casuality accidents types and causes at urban rail stations in the standardized code manner. In order to make standardized codes, 4,086 casuality accidents for Seoul Metro and Seoul Metropolitan Rapid Transit Cooperation (SMRT) are analysed. The standardized code for casuality accident types includes 4 distinct factors; casuality object, casuality location and casuality pattern. Also, the standardized code for casuality accident causes includes 4 distinct factors: casuality trigger, drinking or not, first cause and second cause. This code is deemed to play a big role to link the same casuality accident types or causes which can be used in the process of railroad safety management and emergency response system.
Evaluation of Stress Reduction of Continuous Welded Rail of Sliding Slab Track from Track-Bridge Interaction Analysis
Lee, Kyoung Chan ; Jang, Seung Yup ; Jung, Dong-Ki ; Byun, Hyung-Kyoon ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1179~1189
DOI : 10.12652/Ksce.2015.35.5.1179
Continuous welded rail on bridge structure experiences typically a large amount of additional longitudinal axial forces due to longitudinal track-bridge interaction under temperature and traction/braking load effect. In order to reduce the additional axial forces, special type of fastener, such as ZLR and RLR or rail expansion joint should be applied. Sliding slab track system is known to reduce the effect of track-bridge interaction by the application of a sliding layer between slab track and bridge structure. This study presents track-bridge interaction analysis results of the sliding slab track and compares them with conventional fixed slab track on bridges. The result shows that the sliding slab track can significantly reduce the additional axil forces of the continuously welded rail, and the difference is more significant for long and continuous span bridge.
The Fatigue Life Evaluation of CWR based on the Rail Grinding
Kong, Sun-Young ; Sung, Deok-Yong ; Park, Yong-Gul ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1191~1198
DOI : 10.12652/Ksce.2015.35.5.1191
In this study, vehicle/track interaction analysis by the Saemaul powered vehicle was carried out. The prediction equation for the bending stress of rail was estimated using the rail bending stress by the rail surface irregularities at welds. Also, the fatigue analysis using a S-N curve of welds in the conventional railway was carried out. We estimated the fatigue life of CWR by the fracture probability. By the rail grinding, the fatigue life of CWR was evaluated in consideration to reduce the rail bending stress through removing the rail surface irregularities. Therefore, it presented the fatigue life of CWR according to the rail grinding execution plan in the conventional railway.
A Study on the Directions of Housing Supply for the One-Person Household in Farming and Fishing Regions
Kim, Tae-Joo ; Ahn, Jung-Geun ; Jung, Oh-Rock ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 5, 2015, Pages 1199~1207
DOI : 10.12652/Ksce.2015.35.5.1199
One-person household is increasing by the growth of unemployment, divorce, aging in Korea. In particular, One-person households have rapidly increased around Farming & Fishing Regions. In this regard, this research aims to suggest the directions of housing supply for one-person households suitable for Farming & Fishing Regions by investigating the characteristics of one-person households in the social, economic, and physical aspects. This study found out that one-person households could be divided into two groups; one group lived in industrialized Farming & Fishing Regions and the other group lived in traditional Farming & Fishing Regions. For one-person households living in industrialized Farming & Fishing Regions, it is necessary to provide age-mixed residential sites where companies and manufacturers are condensed. On the other hand, for the one-person households living in traditional Farming & Fishing Regions, it in necessary to provide multi-person housing units for increasing the quality of life ofne-person households.