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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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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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Wind Pressure Reducing Soundproof Wall Which Has Many Holes on the Surface and Selectable Stop-Frequency Ranges
Kim, Sang-Hoon ; Lee, Donchool ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 191~196
DOI : 10.12652/Ksce.2016.36.2.0191
Applying diffraction of waves and muffler principle, the theory of macroscopic air ventilation with soundproofing was explained. Soundproofing frequency range can be selected by this method. The sound wave was attenuated at the resonator located between double-layered walls. A soundproof plate was designed and the experiment was processed. There are two air holes of diameter of 5cm and thickness of 8cm on the surfaces per each soundproofing cell. There was a transmission loss of about 25dB and it is more than at least 10dB compared with that of the Comnex technology of wave cancellation by air holes in Japan. Furthermore, there was no soundproof frequency selection in the Comnex technology.
Dynamic Characteristics and Power Generation Performance Evaluation of Customized Energy Block Structures
Noh, Myung-Hyun ; Kim, Hyo-Jin ; Parl, Ji-Young ; Lee, Sang-Youl ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 197~206
DOI : 10.12652/Ksce.2016.36.2.0197
This study carried out structural behaviors and power generation performances of customized energy harvesting block structures, especially for infrastructures such as parking facility. The improved energy block structures described in this study were represented by using numerical and experimental models. In particular, the composite-PZT hybrid energy blocks are tentatively proposed for better structural durability and power generation effects. The finite element model using ABAQUS program is used for studying static and dynamic characteristics of block structures made of composite materials. In addition, we evaluated the various power generation capacities of advanced energy block structures through laboratory-scale and field experiments.
Modeling of Gas Permeability Coefficient for Cementitious Materials with Relation to Water Permeability Coefficient
Yoon, In-Seok ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 207~217
DOI : 10.12652/Ksce.2016.36.2.0207
Permeability can not be expressed as a function of porosity alone, it depends on the porosity, pore size and distribution, and tortuosity of pore channels in concrete. There has been considerable interest in the relationship between microstructure and transport in cementitious materials, however, it is very rare to deal with the theoretical study on gas permeability coefficient in connection with carbonation of concrete and the effect of volumetric fraction of cement paste or aggregate on the permeability coefficient. The majority of these researches have not dealt with this issue combined with carbonation of concrete, although carbonation can significantly impact on the permeability coefficient of concrete. In this study, fundamental approach to compute gas permeability of (non)carbonated concrete is suggested. For several compositions of cement pastes, the gas permeability coefficient was calculated with the analytical formulation, followed by a microstructure-based model. For carbonated concrete, reduced porosity was calculated and this was used for calculating the gas permeability coefficeint. As the result of calculation of gas permeability for carbonated concrete, carbonation leaded to the significant reduction of gas permeability coefficient and this was obvious for concrete with high w/c ratio. Meanwhile, the relationship between gas permeability and water permeability has a linear function for cement paste based on Klinkenberg effect, however, which is not effective for concrete. For the evidence of the modeling, YOON's test was accomplished and these results were compared to each other.
Numerical Analysis of River Bed Change Due to Reservoir Failure Using CCHE1D Model
Son, In Ho ; Kim, Byunghyun ; Son, Ah Long ; Han, Kun Yeun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 219~229
DOI : 10.12652/Ksce.2016.36.2.0219
This study presents the analysis of flood and bed deformation caused by reservoir failure. The CCHE1D is used to simulate 1D non-uniform, non-equilibrium sediment transport and bed deformation. The CCHE1D deals with the adaptation length for non-equilibrium sediment, classified sediment particle for non-uniform sediment and mixing layer for the exchange with the sediment moving with the flow. The model is applied to Ha!Ha! river basin where was experienced reservoir failure in 1996 to analyze non-uniform and non-equilibrium sediment transport. The calculations are compared with morphological bed changes of pre- and post-flood. In addition, model sensitivity to main parameters involving adaptation length (
), non-equilibrium coefficient (
), mixing layer thickness (
) and porosity (p') is analyzed. The results indicates that thalweg change is the most sensitive to non-equilibrium coefficient (
) among those parameters in the study area.
Two-Dimensional Flood Inundation Analysis Resulting from Irrigation Reservoir Failure - Focused on the Real Case with the Minimal Data Set -
Lee, Jae Young ; Kim, Byunghyun ; Park, Jun Hyung ; Han, Kun Yeun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 231~243
DOI : 10.12652/Ksce.2016.36.2.0231
This study presents the applicability of two-dimensional (2D) flood inundation model by applying to real irrigation reservoir failure with limited available data. The study area is Sandae Reservoir placed in Gyeongju and downstream area of it and the reservoir was failured by piping in 2013. The breach hydrograph was estimated from one-dimensional (1D) hydrodynamic model and the discharge was employed for upstream boundary of 2D flood inundation model. Topography of study area was generated by integrating digital contour map and satellite data, and Cartesian grids with 3m resolution to consider geometry of building, road and public stadium were used for 2D flood inundation analysis. The model validation was carried out by comparing predictions with field survey data including reservoir breach outflow, flood extent, flood height and arrival time, and identifying rational ranges with allowed error. In addition, the applicability of 2D model is examined using different simulation conditions involving grid size, building and roughness coefficient. This study is expected to contributed to analysis of irrigation reservoirs were at risk of a failure and setting up Emergency Action Plan (EAP) against irrigation reservoir failure.
A Comparative Study on Geotechnical System Response Probabilities of Fill Dams in Korea Using Internal Erosion Toolbox
Kim, Woo-Yong ; Lim, Jeong-Yeul ; Mok, Young-Jin ; Jung, Young-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 245~258
DOI : 10.12652/Ksce.2016.36.2.0245
In this study the geotechnical system response probabilities (SRP) of the failure modes caused by the interal erosion in three dams with different histories of defects in Korea were analyzed via the internal erosion toolbox developed by USACE. The calculated values of SRP were compared with the values reported for other dams in worldwide and also the statistics on the past failures of dams and embankments in Korea. The calculated values of SRP related to the internal erosion adjacent to the conduits or spillway structures are as high as in the order of
that is significantly greater than the SRP values related to other mechanisms of internal erosion. The statistical data showing that the interal erosion adjacent to the structure is the most frequent cause of the failure of the dam in Korea could be a collateral evidence of this finding. In contrast, the values of SRP related to the internal erosion through foundation, one of the major causes of dam failure in worldwide, are relatively as low as in the order of
. This result could be comparable with the rareness of the failure cases of dam caused by the internal erosion through foundation in Korea.
A Variational Inequality-based Walkability Assessment Model for Measuring Improvement Effect of Transit Oriented Development (TOD)
Sohn, Jhieon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 259~268
DOI : 10.12652/Ksce.2016.36.2.0259
The core strategy of transit oriented development (TOD) is to promote high density mixed land use around railway stations. Case studies in advanced countries show that provision of policies for comprehensive maintenance of pedestrian facilities around railway station spheres is being pursued with efficacy. In spite of the importance placed on integrated pedestrian maintenance, domestic construction of integrated pedestrian infrastructure around railway station spheres lacks direction. Thus, there is a clear need for an evaluation standard that can provide the foundation for judgments on TOD improvement. This research proposes a network model that consolidates the interior of the station as well as its surrounding areas to determine the ease of pedestrian flow for effective TOD evaluation. The model considers the railway station and surrounding areas as an assembled network of pedestrian flow. The path chosen by the pedestrian is defined as the optimal degree of inconvenience, and expands on Wardrop's User Equilibrium (1952). To assess the various circumstances that arise on pedestrian facilities including congestion of the pedestrian pathway, constrained elevator capacity, and wait at the crosswalk, a variational inequality based pedestrian equilibrium distribution model is introduced.
An Analysis of Perceptions of Road Construction Engineers on ICEC Framework at the time of System Transition from Responsibility Supervision to Construction Management (III) - Main Focus of Application for CM & ICEC -
Park, Hyo-Sung ; Kim, Nak-Seok ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 269~276
DOI : 10.12652/Ksce.2016.36.2.0269
Recently the organizations related construction express frequently their opinion to MOLIT at the time of introducing the ICEC grade system and converting a system from responsibility supervision (RS) to construction management (CM). However there was no data to investigate the recognition of road construction engineers about the policy change. In this study, a questionnaire survey was conducted and analyzed twice to the road construction engineers on the CM and ICEC grading system at the Korea Institute of Construction Technology Education. The trend of response from the road construction engineers was verified through the survey separately from other institutions. This study analyzed the results and introduced a desirable policy proposal to promote an international competitiveness of the engineering industry.
A Study on Automated Quantity Take-off Methods of Earth Works in Road Design using 3D Design Concept
Cho, Myunhwan ; Kim, Nakseok ; Chae, Jae-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 277~283
DOI : 10.12652/Ksce.2016.36.2.0277
Recently, the interests in three-dimensional design and BIM(Building Information Modeling) are increasing in civil engineering sector and the researches about three-dimensional design and quantity take-off methods for civil engineering structures have been conducted. However, these studies are just carried out the 3D design and quantity calculation of civil structures on the road or railway such as bridges and tunnels. The study on the quantity take-off methods and the evaluation of calculated results on the earth works should be performed in more detail. Based on these backgrounds in mind, the study was conducted the three-dimensional road design and evaluated the quantity take-off results on the earth works using 3D calculation method(average end area method, prismoidal method and composit method). The calculated quantity from composit method showed about 5% error of measuring efficiency than the average end area method, and when reporting the quantity calculation of earth works, it is necessary to specify the calculation method using quantity take-off of earth works.
A Study on the Need of Specialized Institution for Post-Evaluation of Construction Projects
Lee, Du-Heon ; Park, Hee-Sung ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 285~295
DOI : 10.12652/Ksce.2016.36.2.0285
The post-evaluation system after construction projects can evaluate estimates of use demand, project cost, and project schedule estimated in the planning phase of construction projects in public sector. Thus, it was introduced in 2000 for the purpose of reduction in future errors during similar constructions by project orderer by referring the post-evaluation results. However, many barriers to the post-evaluation system after construction projects have been reported due to evaluation systems that lack objectivity and reliability and lack of main bodies that utilize the system. Thus, this study derived implications for improvements of the post-evaluation system in Korea by benchmarking building project evaluation system and management as well as utilization systems of developed nations. Then this study conducted a survey with experts who have experienced activities in the post-evaluation committee and members of post-evaluation for public project owners. Therefore it identified the need of installation of specialized post-evaluation institutions as well as functions and work tasks to be taken by specialized institutions. Based on the analysis results, this paper provided revision drafts of related legislations and guidelines to be effective in post-evaluation. Through the study results, many trial and errors can be reduced in similar projects in the future by performing in-depth analysis on large-scale construction projects and repeatedly applied building project practices can be improved to raise technical competitiveness if the specialized institution is installed.
An Analysis of the Characteristics of Environmental Impact for PSC Beam Bridges using Life Cycle Assessment
Cho, Namho ; Yun, Won Gun ; Lee, Wan Ryul ; Kim, Kyong Ju ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 297~305
DOI : 10.12652/Ksce.2016.36.2.0297
This study aims to analyze characteristics of environmental load for the construction phase of PSC beam bridge based on Life Cycle Assessment. For detail computation of environmental load, the construction materials and energy consumption are derived from the BOQ, also connecting with environmental load by Korea LCI Database Information Network. The characteristic of environmental impact was analyzed by 25 cases and cut-off ratio was 80% to 94%. The result sorted by construction materials revealed that environmental load were 53.3% for ready-mixed concrete, 9.6% for wire rod, 7.8% for rebar, 6.8% for cement, 5.5% for plywood, and 5.2% for energy. Furthermore, the result of environmental impact revealed that 45.5% for global warming, 30.4% for abiotic resources depletion, 10.5% for human toxicity, and 8.9% for photochemical oxidant creation. In the future, we can make a decision considering environmental load based on LCA at design phase.
Analysis of Environmental Load by Work Classification for NATM Tunnels
Lee, Ju-hyun ; Shim, Jin Ah ; Kim, Kyong Ju ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 307~315
DOI : 10.12652/Ksce.2016.36.2.0307
Many countries are trying to reduce a greenhouse gas to step up their fight against climate change. There are many studies related to building only for reducing a greenhouse gas in construction area but studies related to reducing a comprehensive environmental load including various pollutants that affects the global environment are lacking. This study aims to analyse the characteristics of environmental load by work type for tunnel projects. Analysis showed that seven work types, including lining concrete, shotcrete, tunnel portal and open-cut tunnel work, etc., are representative works generated environmental load. These seven works represent 89.22 percent of total environmental load. In addition, comparison results of environmental load per tunnel's length by work type showed that a major factor of environmental load is caused by a tunnel portal and open-cut tunnel work with relatively short length (excavation length). And lining concrete and shotcrete work are larger than any other environmental load with tunnel's total length. It is expected that the result of this study will be used to make a estimation model for environmental load using approximate quantity survey of representative work types in the early stage of tunnel design. And it will be play a considerable role in establishing of environment management plan for sustainable infrastructure construction.
Comparative Assessment of Suspension Bridge Construction and Engineering Technology
Park, Tae-Soon ; Park, Hee-Sung ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 317~324
DOI : 10.12652/Ksce.2016.36.2.0317
This paper is to provide information for quantitative evaluation of suspension bridge engineering and construction technology, technology development, and long-span bridge R&D agenda. Technology classification structure and key words are established and survey to identify technology level is performed. Then, competitiveness of patents and journal articles is evaluated for Korea, USA, Japan, Germany, France, and England. As a result, USA and Japan are generally competitive countries for all technology categories based on patents and journal articles. Korea is grouped in upper-middle class for overall technology level of suspension bridge. However, there are some variances among the level of technologies. This research results could be utilized as reference to establish future long-span bridge R&D. Also, it can be a standardized methodology to compare technology levels among countries.
Configuring Excavator Attachments for Eco-Operation
Lee, Hong-Chul ; Kim, Byung-Soo ; Lee, Dong-Eun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 325~332
DOI : 10.12652/Ksce.2016.36.2.0325
Configuring excavator attachments and engine sizes is the prerequisite for appropriate excavator assignment. Existing experience based configuration practice is lack of scientific rational because many variables (e.g., equipment motion data, soil and rock type and condition, equipment's engineering dimension along with bucket properties, job and management conditions etc.) should be considered simultaneously and timely fashion. This paper presents a new excavator configuration searching method that identifies the most favorable excavator configuration (i.e., the optimal set of excavator's maximum digging height and bucket size) to complement these existing practices. The method coded by using MATLAB identifies an optimal excavator configuration by considering those variables causing the variability of productivity. A case study is presented to demonstrate and to verify the system.
A Study on the Influence of the Space Syntax and the Urban Characteristics on the Incidence of Crime Using Negative Binomial Regression
Kim, Hyeong Jun ; Choi, Yeol ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 2, 2016, Pages 333~340
DOI : 10.12652/Ksce.2016.36.2.0333
The aim of this study is to specifically understand the characteristics of the crime by empirical analysis for the determining factors that affect determining the crime through the space syntax in Busan. In this study, poisson regression and negative binomial regression were used for accurate analysis. 8 variables that were significant of the total 13 variables. The summary if this study based on the results is as follow. Statistically significant variables are female ratio, over 65 population ratio, administration are and commercial area ratio in characteristics. And the more CCTVs a region has, the lower crime rate it shows. As a results of examing whether space syntax variables can predict crime occurrence places. Space with low connectivity come to be a crime causal factor because they have few other related spaces and thereby have low possibility of sudden appearance of interrupters, which results in low surveillance levels of foot passengers. It will provide the basic data that can contribute to urban planning and implementation of crime prevention aspects.