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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 36, Issue 4 - Aug 2016
Volume 36, Issue 3 - Jun 2016
Volume 36, Issue 2 - Apr 2016
Volume 36, Issue 1 - Feb 2016
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Generation of Artificial Time History Covering Design Response Spectrum by Two Modification Functions
Park, Gun ; Hong, Ki Nam ; Han, Sang Hoon ; Kim, Jae Suk ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 1~11
DOI : 10.12652/Ksce.2016.36.1.0001
The domestic and foreign seismic design codes have specified that time history covers design response spectrum when the response spectrum, which calculated from the time history, is smaller than the design response spectrum at five points or less. In order to verify the design codes, time history analysis for a pier was performed by using five artificial time histories conforming design code with various characteristics and its member forces were evaluated according to them. It was confirmed from analysis results that, regardless of the conformity to design code requirement, seismic design using the artificial time histories could not guarantee earthquake resistant design if the response spectrum from them is lower than design response spectrum at the similar period to the natural frequency of structure. Thus, the time history generating method to make its acceleration response spectrum to be greater than design response spectrum at all period was proposed by two modification function in this study. It was also verified whether time histories from the proposed method satisfy the seismic design codes or not.
Optimal Rise Depth of the ESS Water Tank using Embossed Panel
Kim, Min June ; Jeong, Je Pyong ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 13~19
DOI : 10.12652/Ksce.2016.36.1.0013
This study is on the optimal rise depth of embossed panel for the ESS water tank. The thickness of panel is reduced at pressing operation, it could be calculated by volume conservation condition. The analysis of panel using STS304 material conducted by FEM. As a result of structural analysis, it was found that the optimal rise depth of arch embossed panel is recommended to be 70~90mm and the optimal rise depth of pyramid embossed panel is recommended to be 150~200mm. The proposed value of optimal rise depth could be a useful to the economic design of ESS water tank panel.
Initial Equilibrium State Analysis of Cable Members for Preliminary Analysis of Multi-span Suspension Bridge under Dead Load
Choi, Dong-Ho ; Na, Ho-Sung ; Gwon, Sun-Gil ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 21~29
DOI : 10.12652/Ksce.2016.36.1.0021
This paper proposes a method to determine the initial equilibrium state of cable members for preliminary analysis of multi-span suspension bridge under dead load. The proposed method is simpler and more practical than the previous methods used in other studies. The proposed method can be applied to three-span or multi-span suspension bridges. To verify the proposed method, an three-span model as well as four-span models such as New Millenium Bridge in Korea and Yingwuzhou Bridge in China are analyzed. In the verification results, the initial coordinates and tensions of the members calculated by the proposed method are good agreement with those in the previous study for the three-span model and those in the design data of New Millenium Bridge. In addition, the proposed method gives the initial values to keep the initial configuration of Yingwuzhou Bridge.
A Study on Behaviors of Pile Protective Structures by Simplified Collision Model
Lee, Gye Hee ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 31~38
DOI : 10.12652/Ksce.2016.36.1.0031
In this paper, the deformation-energy curves of the plastic hinges and the vessel bow, which are the major energy dissipation mechanism of a pile protective structures, were estimated, and the parametric study was performed by using those curves to apply the simplified collision model which developed in the previous study. Considered parameters were the mass of slab, the number of piles, the mass of vessel and the collision speed. As results, the difference of energy dissipation mechanism of two pile types (filled and non-filled) were revealed, and the collision behaviors of the protective structures could be tuned by the control of the inertia mass of capping slab. Therefore the simplified collision model can be used in a primary design and optimal design.
Estimation of Bond Performance Improvement by Surface Treatment Equipments and Polymer Content by Boned Concrete Overlays
Jung, Won Kyong ; Kim, Hyun Seok ; Kwon, Oh Seon ; Kim, Hyung Bae ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 39~47
DOI : 10.12652/Ksce.2016.36.1.0039
Repair methods of aging concrete pavement are generally used composite structure pavements, such a composite structure is subjected to a large impact on the mechanical behavior and ensure long-term commonality integrated under vehicle loads, environmental loads of the public in accordance with the bond strength between old and new concrete. A common of bonded concrete overlays that are currently available is Interface arrangements using a variety of equipment to ensure the excellent bond strength between old and new concrete than standard concrete, mixed with a material such as a polymer in order to improve the adhesion with the material itself. However, these method of constructions are being applied, depending on the developer site presents no special specifications apply when a specific application criteria objectively, this is due to the situation of each individual method, which is based on the difficulty in quality control of the site manager. In this study by performing a field test for polymer content via the variables that contribute most significantly to ensure bond strength and the field element core of the interface processing method and materials to ensure bond strength between the old and the new concrete, it was to derive the construction site construction method that can improve the performance of the bond strength through a review of the construction around the correlations and the bond strength according to the effective performance analysis of the conventional surface treatment process and variation of polymer volume fraction.
Warm Season Hydro-Meteorological Variability in South Korea Due to SSTA Pattern Changes in the Tropical Pacific Ocean Region
Yoon, Sun-kwon ; Kim, Jong-Suk ; Lee, Tae-Sam ; Moon, Young-IL ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 49~63
DOI : 10.12652/Ksce.2016.36.1.0049
In this study, we analyzed the effects of regional hydrologic variability during warm season (June-September) in South Korea due to ENSO (El
-Southern Oscillation) pattern changes over the Tropical Pacific Ocean (TPO). We performed composite analysis (CA) and statistical significance test by Student's t-test using observed hydrologic data (such as, precipitation and streamflow) in the 113 sub-watershed areas over the 5-Major River basin, in South Korea. As a result of this study, during the warm-pool (WP) El
year shows a significant increasing tendency than normal years. Particularly, during the cold-tongue (CT) El
decaying years clearly decreasing tendency compared to the normal years was appeared. In addition, the La
years tended to show a slightly increasing tendency and maintain the average year state. In addition, from the result of scatter plot of the percentage anomaly of hydrologic variables during warm season, it is possible to identify the linear increasing tendency. Also the center of the scatter plot shows during the WP El
year (+17.93%, +26.99%), the CT El
year (-8.20%, -15.73%), and the La
year (+8.89%, +15.85%), respectively. This result shows a methodology of the tele-connection based long-range water resources prediction for reducing climate forecasting uncertainty, when occurs the abnormal SSTA (such as, El
) phenomenon in the TPO region. Furthermore, it can be a useful data for water managers and end-users to support long-range water-related policy making.
A Study on the Effect of the Urban Regeneration Project on the Reduction of Carbon Emission - A Case Study of Jeonju Test-Bed -
Park, Kiyong ; Lee, Sangeun ; Park, Heekyung ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 65~74
DOI : 10.12652/Ksce.2016.36.1.0065
This study mainly focuses on urban regeneration project as a countermeasure to resolve climate change issues by analyzing the carbon-reduction effect of Jeonju test-bed cases. First, an urban regeneration project is designed for city, Jeonju by analyzing its environmental problems and potential improvement. Then, carbon emission and reduction amounts are evaluated for different businesses and scenarios. Carbon emission sources are classified according to a standard suggested by IPCC, and the emissions are calculated by various standard methods. The result shows that carbon emission amount in Jeonju test-bed is 102,149 tCO2eq. The fact that 70% of the emission from energy sector originates from buildings implies that urban regeneration projects can concentrate on building portions to effectively reduce carbon emission. It is also projected carbon emission will decrease by 3,826tCo2eq in 2020 compared to 2011, reduction mainly based on overall population and industry shrinkage. When urban regeneration projects are applied to 5 urban sectors (urban environment, land use, green transportation, low carbon energy, and green buildings) total of 10,628tCO2eq is reduced and 4,857tCO2 (=15.47%) when only applied to the green building sector. Moreover, different carbon reduction scenarios are set up to meet each goal of different sectors. The result shows that scenario A, B, and C each has 5%, 11%, and 15% of carbon reduction, respectively. It is recommended to apply scenario B to achieve 11% reduction goal in a long term. Therefore, this research can be a valuable guideline for planning future urban regeneration projects and relative policies by analyzing the present urban issues and suggesting improvement directions.
Evaluation on Field Applicability of Cast-In-Place Pile using Surfactant Grout
Do, Jinung ; Kim, Hakseung ; Park, Bonggeun ; Lee, Juhyung ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 75~83
DOI : 10.12652/Ksce.2016.36.1.0075
In case of underground construction affected by groundwater, CIP (Cast-In-Place Pile) method is generally used to resolve the geo-hydraulic problem. However, as this method has poor connectivity between piles, an auxiliary method for cut-off is needed in many cases. In this study, a new concept earth retaining wall method (H-CIP) with no auxiliary method, by using surfactant grout (Hi-FA) which improves antiwashout and infiltration ability, is introduced, and its field applicability is evaluated. CIP and H-CIP piles were installed with same ground conditions, and field and laboratory tests were conducted to verify the performance. As results, newly contrived H-CIP method shows higher field performance for cut-off and strength than conventional CIP method.
A Study on the Shape and Cone Resistance of Dredged Fill in Geotextile Tube under Water and Drained Conditions
Kim, Hyeong Joo ; Won, Myoung Soo ; Lee, Jang Baek ; Kim, Young Shin ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 85~96
DOI : 10.12652/Ksce.2016.36.1.0085
A series of tests were conducted to examine the filled tube shape with respect to the filling module type used and to investigate cone resistance properties of a dredged-soil-filled geotextile tube under water and drained conditions. Results based on the filling observation showed that the distribution of the accumulated fills inside the acrylic cell and vinyl tubes differs with respect to the type of filling modules. A crater formation around the inlet area was found during the test using I-type filling module and a horizontal sediment distribution was found during the test using inverse T-Type filling module. The dredged fill material was obtained from the Saemangeum area. The geotextile tube deformation of each filling stage was almost converged when the tube was fully drained. The cone resistance of the dredged fill in the geotextile tube under drained condition is large and is approximately 2~6 times that of the tube under water condition.
The Comparative Study on Travel Behavior and Traffic Accident Characteristics on a Community Road - With Focus on Seoul Metropolitan City
Lim, Joonbeom ; Lee, Sooil ; Choi, Jongchul ; Joo, Sungkab ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 97~104
DOI : 10.12652/Ksce.2016.36.1.0097
In Korea, the number of crash accident victims per 100,000 population is three times higher than the average of OECD. In particular, 60% of it occurs on the community road. Thus, this study intends to analyze the causes of such accidents through a pedestrian and vehicle traffic survey. The purpose is to establish practical safety enhancement measures for community roads. In recent years, lots of changes have occurred in the pedestrian environment. A traffic survey shows that 65% of pedestrians walk on the right and 17% of people use smart-phones while walking. An eye camera experiment shows that the operation load of drivers on the community roads is more than 4 times higher than those in urban roads. According to a speed survey, 62% of vehicles drive at 30km/h or above. The characteristics of accidents on community roads are as follows. First, the ratio of accidents on the edge of the road is 2.3 times as high as those on other roads. Second, when people walk on the right, the ratio of accidents is 2.5 times as high as that of walking on the left. Third, it becomes more dangerous when people cross the road from the right to the left. The majority of accidents is caused by unsafe driving (84.4%). When a vehicle makes a left turn, the likelihood of accidents is 2.3 times as high as those caused by a right turn. The ratio of accidents caused by vehicles going backwards is 14% among all accidents. In community roads, the focus of drivers should be at least 4 times higher than those on urban roads. Thus, walking in the opposite direction of vehicles and careless behaviors are highly likely lead to accidents.
Development of Dynamic Passenger-Trip Assignment Model of Urban Railway Using Seoul-Incheon-Gyeonggi's Transportation Card
Sohn, Jhieon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 105~114
DOI : 10.12652/Ksce.2016.36.1.0105
With approximately 20 million transportation card data entries of the metropolitan districts being generated per day, application of the data to management and policy interventions is becoming an issue of interest. The research herein attempts a model of the possibility of dynamic demand change predictions and its purpose is thereby to construct a Dynamic Passengers Trip Assignment Model. The model and algorithm created are targeted at city rail lines operated by seven different transport facilities with the exclusion of travel by bus, as passenger movements by this mode can be minutely disaggregated through card tagging. The model created has been constructed in continuous time as is fitting to the big data characteristic of transport card data, while passenger path choice behavior is effectively represented using a perception parameter as a function of increasing number of transfers. Running the model on 800 pairs of metropolitan city rail data has proven its capability in determining dynamic demand at any moment in time, in line with the typical advantages expected of a continuous time-based model. Comparison against data measured by the eye of existing rail operating facilities to assess changes in congestion intensity shows that the model closely approximates the values and trends of the existing data with high levels of confidence. Future research efforts should be directed toward continued examination into construction of an integrated bus-city rail system model.
Development and Application of LOS (Level of Service) for Accessibility to Railway Stations
Kim, Si Gon ; Kim, Dong Hwan ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 115~120
DOI : 10.12652/Ksce.2016.36.1.0115
This paper presents how LOS (Level of Service) of connectivity at railway stations is developed. Based on interview surveys to railway users at 56 railway stations, the catchment areas for railway is defined and MOE (Measures of Effectiveness) is also developed. The MOE is determined to be the weighted access time (min) and LOS "D" was set up between 45 mins and 60 mins. The 56 railway stations is evaluated based on this MOE and most of them is found to be below LOS "E". Finally some guideline for improving the LOS of accessibility. They are an expansions of accessibility facility, an expansion of bus route, an improvement of congestion roads, and expansions of parking lots for automobile users.
The Responsibility of An Infrastructure Manager Toward A Railway Competitive Market
Yun, Gyeong Cheol ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 121~128
DOI : 10.12652/Ksce.2016.36.1.0121
The restructuring of Korean railway industry, separation of between train operators and an infrastructure manager, had been conducted in 2004 to increase the productivities of railway operations. However, the maintenance-staffs are still employed by Korail (train operator), not by the infrastructure manager, which led the maintenance of railway infrastructure to be conducted by the train operator. The infrastructure manager is now only taking care of financial transferring issues once the train operator requests expenses spent for facility maintenance. Such incomplete restructure may result in a lack of safety performance on railway operations as the roles and responsibilities are less likely to be assigned under the multiple train operators. Thus, this study proposes the way of structuring maintenance divisions and their roles and responsibilities to assure the safe work execution under the circumstance of multiple train operators on the same rail network.
Railway Investment and Operation combined with Accessibility and Transfer Systems
Kim, Si Gon ; Mun, Ye Up ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 129~133
DOI : 10.12652/Ksce.2016.36.1.0129
This paper insists that the accessibility and transfer facility has also to be included in railway investment because railway mode can not be, what is called, a door to door service. At present those facility are not included in the railway investment with them in negligence. Since those facility is not treated with railway system there is no room to get a budget from the central government. This paper suggests that all the measurements have to be implemented, based on the LOS (Level of Service) of accessibility and transfer at railway stations. The LOS has to be as low as reasonably practical (ALARP) which can be derived from the consensus between government and citizens. Also, a couple of procurement methods are suggested for accessibility and transfer facility separately. Finally, improvement of regulations are also suggested.
Using Cost-Benefit Analysis for a Feasibility Study on Constructing a Storage Facility in the Small River Basin
Seo, Se-Deok ; Lee, Seung-Wook ; Park, Hyung-Keun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 135~141
DOI : 10.12652/Ksce.2016.36.1.0135
This study aims to analyze the feasibility of installing a storage facility and make recommendations based on a cost-benefit analysis regarding the installation of a storage facility capable of preventing both floods and droughts. The capacity and installation costs are specified for the storage facility necessary to prevent floods, and a cost-benefit analysis is conducted by calculating the costs and benefits for each cost or benefit factor such as loss amounts, recovery costs, and drought prevention. The information can be used as the basic data for suggesting the feasibility of installing a multipurpose storage facility capable of preventing floods and droughts simultaneously. Also, this study expects to utilize its detailed results in a number of different ways including the prediction of loss amounts from natural disasters.
Evaluation of the Relationship between Geogrid Rib Size and Particle Size Distribution of Ballast Materials using Discrete Element Method
Pi, Ji-Hyun ; Oh, Jeongho ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 143~149
DOI : 10.12652/Ksce.2016.36.1.0143
This study evaluated the shear behavior of geogrid reinforced ballast material using a large scale direct shear test and discrete element method (DEM) based on PFC 3D program. The direct shear test was conducted on ballast materials that have different particle size distributions. Whereas the test results revealed that the shear strength generally increased with the larger particle size of ballast material without geogrid reinforcement, the shear behavior of ballast material was found to change pertaining to the relationship between particle size distribution and geogrid rib size. Generally, it is deemed the effectiveness of reinforcement can be achieved when the rib size is two times greater than average particle size. A numerical analysis based on DEM was conducted to verify the test results. The geogrid modeling was successfully completed by calibration process along with sensitivity analysis to have actual tensile strength provided by manufacturer. With a given geogrid model, the parametric evaluation was further carried out to examine the interactive behavior between geogrid and ballast material. Consequently, it was found that the effectiveness zone of geogrid reinforcement generated within a specific depth.
The Practical Use of Unused Facilities in the Elementary School and Spatial Strategy to Build Learning City - Focused on Dongnae-Gu in Busan -
Kang, Youn Won ; Kim, Jong Gu ; Sohn, Jee Hyun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 151~156
DOI : 10.12652/Ksce.2016.36.1.0151
Making a learning city which allows unlimited accessibility to a chance of learning plays an important role to accomplish individuals'self-realizaton and advance quality of life so that improve whole competition of the city. Although securing enough space is necessary to realize the learning city, our reality has an imbalanced city structure which could hamper it. The purpose of this study is to examine the way to resolve the spatial imbalance by utilizing unused facilities located in elementary schools. The resulting conclusions provide implications that current low effectiveness is originated from passive participation of schools and leading better participation is needed to improve it.
Evaluation of Privately Owned Public Spaces within Detached Housing Areas in Pangyo City - Focusing on the Mixed use Housing Areas
Park, Kyung Seo ; Kang, Jun Mo ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 157~167
DOI : 10.12652/Ksce.2016.36.1.0157
Detached residential housing areas are located in the west part of Pangyo City. Seven areas of them are designated for the displaced residents from their original homes by the city development, in which commercial use on the first floor is permitted. The District Plan for the areas were establishes, and one of its main goals is to secure privately owned public spaces (POPS). This research conducted a post enumeration survey on the POPS on the blocks in the seven areas, which blocks contain inner corridors between two rows of housing units. Analytical review of the survey result reveals that (1) POPS facing roads are mainly being used as parking lots or expansion-spaces for the commercial use on the first floor, (2) inner POPS forming corridors are being neglected and otherwise being used as storage areas or outdoor sub-kitchen spaces, and (3) no consideration has been taken for the continuity of the sloped corridors. Regardless of a few good practices in terms of air circulation and lighting, the POPS in the blocks prove to be limited in following the plan's original design intentions and principles.
A Study on Application of Port Hinterland by a Space Port City Interface Characteristics
Hwang, Sun Ah ; Kim, Jong Gu ; Hong, Ji Su ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 169~180
DOI : 10.12652/Ksce.2016.36.1.0169
The spaces of port and urban in a Port City have different space characteristics substantially, but those are required to be developed interdependently. Degradation and loss of the sense of place in the existing spaces caused by decline of natural function have an adverse effect on the revival of local economy as well as make worse image of the entire city. In some developed countries, therefore, many researches on the port spaces lagging behind the times due to changes of the characteristics and function of port spaces have been conducted continuously for a long time. This study aims at seeking a device how the domestic hinterland could be utilized as efficient spaces having the characteristics of outskirts space and port city interface through the application of characteristics of the interface space of port city, capable of playing a role as buffer zone between the port space and the city space.
A Study of Power Law Distribution of Korean Disaster and Identification of Focusing Events
Kim, Yongkyun ; Kim, Sang Pil ; Cho, Hyoung-Sig ; Sohn, Hong-Gyoo ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 1, 2016, Pages 181~190
DOI : 10.12652/Ksce.2016.36.1.0181
Improvements in disaster management has become a global necessity because the magnitude of disasters is intensifying in parallel with the increased disaster damage. The disaster risk in Korea is also increasing due to the emergence of new types of disaster; such as the Middle East respiratory syndrome coronavirus, the increase of complex disasters, and the heightened probability of a catastrophic event due to climate change. This paper aimed to identify the disaster loss-frequency relationship from 1948 to 2014 in Korea by using four types of variables. In addition, this paper found major disasters that resulted in the reformation of disaster response organizations, and inputted the deaths and economic loss attributed to those disasters into the disaster loss-frequency graph. The research result substantiated that the disaster loss-frequency relationship in Korea follows the Power Law and found the coefficients of each Power Function. Additionally, this paper found that most of the reformations of disaster response organizations happened after major disasters that concentrated societies attention and anger due to the high human and economic impact; such events are labelled as "focusing events." These focusing events, with the characteristics of a low probability and high impact, are located in the long tail of the Power Law Distribution. This paper suggests that the effective public policy for disaster response needs to be developed by paying attention to 'low probability and high impact' focusing events that are located in the long tail of the Power Law Distribution.