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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
Selecting the target year
Fatigue Life Prediction of Asphalt Concrete Mixtures Using Recoverable Horizontal(Tensile) Strain
Kim, Nak-Seok ; Kim, Y.R. ; Im, Jung-Soon ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 203~203
Controlled-stress diametral fatigue testing was conducted to evaluate the effect of different engineering parameters on fatigue life prediction of asphalt concrete mixtures. In this research, the controlled-stress diametral fatigue test method was used due to its many advantages compared with other conventional test methods. Diametral fatigue test results plotted on logarithmic scale of recoverable horizontal deformation and number of cycles to failure showed a good agreement with historic trend of the fatigue data. The same approach was followed using the maximum total horizontal strain at the 200th cycle in lieu of using recoverable horizontal strain in the ordinate of the plots. The fatigue lives of the asphalt concrete mixtures were better related with the recoverable horizontal strain than with maximum total horizontal strain. Also, an effort was made to develop relationships between the fatigue constants based on the two strains so that one can apply the fatigue constants (
) based on the recoverable horizontal strain to the fatigue cracking model based on the maximum total horizontal strain. It should be noted that the effect of temperature on the fatigue performance of asphalt concrete determined by using recoverable horizontal strain was opposite to that determined by using maximum total horizontal strain.
A Study on the Visibility and Spacing of Delineator
No, Kwan-Sub ; Kim, Yong-Suk ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 213~213
Delineator provides a driver with information of road's alignment at night by retroreflecting lightbeam from automobile headlight and has been known to play an important role in reducing the run-off-the-road accidents. Although our country has specifications for design and installation regarding the delineator, this specifications have been applied without sufficient authentication or verification. Detailed studies on the specifications are highly necessary therefore for the road traffic safety at night. This study reviews and evaluates the retroreflectivity and spacing of delineator. Particularly, in order to reflect an undesirable road alignment conditions and then to establish the adequate specifications, the spacing of delineator is evaluated under the condition that driver's sight is restricted by road geometry.
Analysis of Performance of Unmodified and Modified Asphalt Mixtures Using Gyratory Testing Machine
Park, Tae-Soon ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 223~223
This study presents selected laboratory test properties and performance of unmodified (AC-10) and modified asphalt mixtures (pure carbon black-CB & pyrolized carbon black-CBp) compacted by the U.S. Army Corps of Engineer Gyratory Testing Machine with oil filled roller(GTM). This machine and compaction method have been accepted to simulate compaction by paving construction equipment and traffic load reasonably well. Compaction effort was varied by changing number of the GTM revolutions. The variation of air-voids and unit weight were estimated to investigate the effect of the inclusion of additives. The performance of mixtures were analyzed by the Gyratory Compactibility Index(GCI), the Gyratory Stability Index(GSI), the Gyratory Shear Factor (GSF) and the Gyratory Shear (Sg), The analyses of the GSI, GSF and air-voids indicated that the inclusion of the CBp in asphalt mixture improved to decrease plastic deformation and to increase shear resistance. Such improvement can be obtained in the use of 5% to 10% CBp to improve initial weakness of the unmodified asphalt. In the meantime, the pure CB mixture showed less improvement compared to the CBp and unmodified mixtures.
Performance Evaluation of Wasted Tire-Chip Added Concrete Bead Pavement
Bae, Ju-Seong ; Moon, Jang-Soo ; Ko, Young-Zoo ; Kim, Jae-Wook ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 235~235
In the viewpoints of the solution of the serious environmental problems and the raising of the economical efficiency, there has been a widespread demand on the technology development and study to recycle massively the wasted tires. The various laboratory tests and field tests were carried out in order to evaluate the performances of the wasted tire-chip added concrete road pavement. As the results, the optimum mixing rate of rubber was approximately 7 percents and it is found that the wasted tire-chip added concrete road pavement is reasonable in its performances such as the resistances against slipping and impacting, bending, ductility, adiabatic change and keeping warm, etc.
Thermal Stress Restrained Specimen Test (TSRST) to Assess Thermal Cracking Resistance of Asphalt-Aggregate Mixtures
Jung, Du-Hwoe ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 249~249
The thermal stress restrained specimen test (TSRST) has been developed to evaluate the thermal cracking resistance of asphalt concrete mixtures. The TSRST is conducted by cooling an asphalt concrete specimen at a specified rate while maintaining the specimen at a constant length. The test results are reported in terms of the temperature at fracture and the maximum stress at failure. Experiments over a wide range of conditions were performed to evaluate the suitability of the TSRST to identify the thermal cracking resistance of asphalt concrete mixtures. Asphalt type has the most significant effect on fracture temperature: air voids content and aggregate type have significant effect on fracture strength. Test results were also affected by the size of the specimen, stress relaxation, degree of aging, and different cooling rates. The shape of the specimen and the asphalt cement content did not have a significant effect. A ranking of asphalt concrete mixtures based on the TSRST fracture temperature was in excellent agreement with a ranking based on the physical properties of the asphalt cement.
On the Extraction of Water Basin Factors from DEM
Choi, Seung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 263~263
In studies of hydrology and surface drainage, it is important to delineate stream channel and ridge networks for the area contributed starting from any point on the topographic surface, to any point on paths of water. The manual handling of these problems is highly laborious, time-consuming and prone to many errors. DEM(Digital Elevation Model) are used to automatically map the stream channel and divide networks of a watershed. This study is an approach to automatically extract map, and encode the spatial structure of drainage basins from DEM file. The goal of this study is to produce stream channel such that the divides completely partition the watershed into drainage subbasin polygons. Their explicit relation to the drainage network may be exploited to construct an efficient hydrologic information system. Also in this time, the law to analyze stream morphological characteristics are analyzed based on the Horton-Strahler's three law on the morphology of a stream that are the law of stream number, the law of average stream length and the law of average stream slope.
The Stability Analysis of a Single Parallel Tunnel Using 3D-FEM
Wee, Seong-Dong ; Lim, Hee-Taek ; Song, Chung-Han ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 275~275
The purpose of this paper is to evaluate the stability of a single parallel tunnel in the Seoul subway 6-6. The tunnel is constructed by the conventional NATM method and accompanied by a vertical communication hole. In order to do that, the 3D-FEM is performed using DIANA computer program. And a preliminary analysis was performed to determine the boundary zone for analysis. The boundary zone for main analysis is determined based on these results. At this time, for the shotcrete element a curved shell element, which can be satisfied both solid elements of soil and compatibility equation, is used and for the rockbolt element an embedded reinforcement similar to the truss element is applied. The result of 3D-FEM analysis indicates that the tunnel is on a stability condition since it meets with a tolerance limit(displacement, stress, moment, etc.), even if a temporary stress may concentrate at connection portion of a tunnel and a vertical communication hole during a half phase excavation. In a near future, this analysis could obtain much more reliable results in case the back analysis using 3D soil investigation and measurements data is performed successfully. In addition, the blasting and the reinforcement methods are suggested for a safety construction of the tunnel.
A New Kinetic Model for Debris Flow
Hwang, Hak ; Ko, Gap-Soo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 287~287
In the study for debris flow such as an avalanche, the description of the dynamic behavour is difficult. This paper introduces a new model for the fluid motion of an assemblage of cohesionless granules, and qualitatively presents the behaviour of sheared or fluidized layer, focussing on four points: First, the motion of granular assemblage is described by the balance laws of the mass, momentum and energy from the macroscopic viewpoint. Second, four state eqations after the motion of individual particle from the microscopic viewpoint are combined with the balance laws. Third, the change of energy at the boundary surfaces is expressed as the boundary conditions. Fourth, all the results are qualitatively analyzed via dimensional arguments. The fluctuation energy, the density, and the velocity profiles for the fluidized layer are numerically displayed by diagrams. Then results are discussed.
Uniqueness of Solution in the Excavation Analysis with Elasto-Plastic Soil Spring model
Kim, Jae-Kwan ; Lee, Hae-Sung ; Chung, Choong-Ki ; Yang, Tae-Sock ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 295~295
An analysis method of the behavior of earth retaining structures during excavation is developed based on finite element modeling of the retaining structure and the ground medium which is represented as elasto-plastic Winkler model. It is found that the unique solution independent of the excavation steps cannot be guaranteed in the excavation problem of monotonically shrinking elasto-plastic domain if a conventional excavation simulation procedure is employed. In this paper, the cause of the non-unique-ness of the solution is clarified and a new excavation simulation procedure is proposed. It renders unique solution in the case of monotonically shrinking elasto-plastic domain which is modeled as elasto-plastic soil spring.
A Study on Load Transfer and Hydraulic Fracturing in Juam Main Dam and Regulation Dam
Lim, Heui-Dae ; Park, So-Yong ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_3, 1996, Pages 303~303
One of the major problems confronting the engineer is the cracks in the core of rockfill dams. Based upon the field observation, it has been shown that the differential settlement leading to load transfer between adjacent zones is the cause of most cracking and that this phenomenon of load transfer can lead to hydraulic fracturing. In this study, the various mechanisms of load transfer and hydraulic fracturing are outlined and the finite element analyses of Juam main dam and regulation dam were conducted to examine the load transfer ratios and the assumption that hydraulic fracturing occurs in embamkment cores when the reservoir water pressures exceed the major principal stresses. As the results of the analyses, it has been shown that significant load transfer from the core onto the shell was observed and that the major principal stresses by FEM and the total normal stresses by the soil pressure meters exceed the reservoir water pressures. Although the stresses predicted from FEM such as those performed in this study cannot be used as an absolute indication of the state of stress in embankments, they are potentially to be usful at the design stage in making decisions about the material types and geometries.