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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 17, Issue 3_6 - Nov 1997
Volume 17, Issue 2_6 - Nov 1997
Volume 17, Issue 1_6 - Nov 1997
Volume 17, Issue 3_5 - Sep 1997
Volume 17, Issue 2_5 - Sep 1997
Volume 17, Issue 1_5 - Sep 1997
Volume 17, Issue 3_4 - Jul 1997
Volume 17, Issue 2_4 - Jul 1997
Volume 17, Issue 1_4 - Jul 1997
Volume 17, Issue 3_3 - May 1997
Volume 17, Issue 2_3 - May 1997
Volume 17, Issue 1_3 - May 1997
Volume 17, Issue 3_2 - Mar 1997
Volume 17, Issue 2_2 - Mar 1997
Volume 17, Issue 1_2 - Mar 1997
Volume 17, Issue 3_1 - Jan 1997
Volume 17, Issue 2_1 - Jan 1997
Volume 17, Issue 1_1 - Jan 1997
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An Analysis on the Characteristics of the Resilient Modulus of Subbase Materials
Lee, Kyong-Ha ; Lee, Kwang-Ho ; Yoo, Choong-Sik ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 217~217
Up to date no pavement design method has been developed in Korea and the'72AASHTO interim guide and
pavement design method have been used. which are developed in USA and Japan. respectively The AASHTO interim guide was revised in 1986 and the concept of resilient modulus was introduced to characterize the resilient behavior of pavement structure. However difficulties have been encountered for obtaining resilient modulus in a proper manner in accordance with circumstance in Korea. In this study, the characteristics of resilient moduli of subbase materials. which are commonly used in Korea. were studied. Based on domestic highway section data, the typical value for the sress state within the subbase course was derived theoretically. The resilient modulus at this stress state was obtained to form a basis for estimation of layer coefficient for pavement design.
System Developement for Tunnel Management Using GIS
Kim, Kam-Rae ; Jeon, Ho-Won ; Hong, Sun-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 229~229
This paper is aim to build a tunnel management system of railway with GIS. Especially, it operated personal computer will bring easy computing management system on tunnel of railway. To build this system, presented Highway Facility Management System and domestic method tunnel management of railway are investigated. And with that, position and character database are composed. Visual Basic program language operated in more object environment on Windows 95, is used to build this system. Positional database is constructed which are indicate Administration division, A railway line. A contour line on 1 : 5,000 map needed in this system. Character database is constructed with analysis of data (a plan and inspection data) of tunnel administration To make this database operate avilable, using database language 'Standard query Language', many sorts at each are programed and executed with practical data analysis to perform effective management system.
Rigorous Geocoding of Radarsat Satellite SAR Data
Jeong, Soo ; Sohn, Hong-Gyoo ; Yeu, Bock-Mo ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 239~239
SAR data can be achieved independently of weather conditions or sun illumination which is mai limitation of electro-optical sensor to get image. The informations from imagery can be more enlarged using SAR data because SAR data offers different informations from electro-optical sensor. SAR data contains various geometric errors caused by the geometric properties of data acquisition. The geometric errors should be removed to get the information with acceptable positional accuracy. to overlay with other data. or to mosaic SAR data from different orbit. Radarsat satellite, launched in November 1995. loaded SAR antenna and offers SAR data with higher resolution than other SAR satellite. However, the transformation from International ellipsoid which is reference of Radarsat satellite to Bessel ellipsoid which is regional ellipsoid in Korea has not been defined yet. Moreover, the ephemeris data of Radarsat is referenced in Inertial coordinate system which should be transformed to Geocentric coordinate system for geocoding process. This is great barrier in geocoding of Radarsat SAR data. In this paper. we present a method to estimate orbital position of Radarsat data using some ground control points and a rigorous geocoding procedure of Radarsat satellite SAR data.
A Study on the Lateral Behavior of Steel Pipe Piles Using the Modified Vlasov Model
Kim, Young-Su ; Seo, In-Shik ; Kim, Byoung-Tak ; Kim, Ki-Young ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 249~249
The modified Vlasov model solutions are used to examine the behavior of pile subjected to lateral static loading with free head at tip and top of pile. Realizing the inadequancy of the classical Winkler model to represent an elastic continuum, Vlasov and Leont'ev developed a two-parameter model for a beam on an elastic foundation. Vallabhan and Das developed a unique iterative technique to determine a consistent value of the
parameter on the modulus of subgrade reaction constant. However, in this study. the modified Vlasov model is modified to the calculate on the modulus of subgrade reaction proportional to the depth. The program is developed by using the modified Vlasov model derived in this study and it can be used to calculate the displacement distribution. bending moment distribution, and soil reaction distribution. Model tests are carried out under a simulated field stress condition in sand using a centrifuge apparatus (middle size, Mark II in T.I.T.), on the variation of different gravity acceleration. flexural stiffness of the pile, and relative density of the soil. The results of behavior of the pile obtained by using the model derived in this study are compared with the results of centrifuge model test and the p-y analysis method, which presented by several reseachers (Murchison & O'Neill, Reese et al., Scott. Det Norske Veritas, Kondner, Norris) In compare the modified Vlasov model with the p-y analysis method for the behavior of the pile for the elastic zone (within y/d=5%), the results of modified Vlasov model shows better agreement with measured results than the p-y analysis method.
Model Test on Steel Cellular Bulkhead
Jang, Jeong-Wook ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 261~261
Horizontal loading model tests of steel cellular bulkhead which have various loading height and penetration ratio were performed by means of stress-controlled technique. these tests, the effect of loading height and penetration ratio were qualitatively investigated on the deformation behavior of models. The test result indicates that for the identical penetration ratio. the lower loading height was observed as the higher yielding load, as the lower yielding moment, and as the lower displacement at the same load. For the identical loading height, the higher penetration ratio was observed as the higher yielding load, and as the lower displacement at the same load.
Response of Soil Plug in Pipe Pile to Horizontal and Vertical Seismic Excitation
Choi, Yong-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 267~267
The principal objective is to ascertain whether simulated high amplitude seismic motion (horizontal or vertical motion of the soil) degrades the soil plug in an open-ended pipe pile driven into submerged sand significantly and in turn soil plug resistance would have to be reduced or ignored after a seismic event. A model pipe pile was driven into loose sand in a pressure chamber by impact and loaded under static compression. After unloading, the compressive load of 95% level of ultimate pile capacity was sustained on the pile head and the simulated horizontal or vertical seismic motion was superimposed to the same pile. while pile was allowed the pile head settle. After seismic motion. the static compression load was reapplied until the pile failed. Plug failure was not observed in any of the tests.
Uplift Capacity of a Single Screw Anchor
Cho, Yong-Sun ; Kwon, Oh-Yeob ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 275~275
The purpose of this study is to analyze the uplift behaviour of a single screw anchor embedded in the sand. To analyse the uplift behaviour of the single screw anchor, the laboratory prepared sand layers with different densities are made and model tests are performed with the variation of relative depth. The result of the model tests are examined and compared with the relationships of uplift capacity suggested by the other researchers. As a result, the proposed methods by the other researchers seem to have some problems in application and limitations related to critical depth. In this study, the failure mechanism observed during the model tests is idealized. The upper limit analysis based on the idealized failure mechanism is suggested in order to calculate uplift capacity.
A Study on the Lateral Earth Pressure by the Narrowly Backfilled Soil
Lee, Sang-Duk ; Moon, Chang-Yul ; Kim, Eun-Sup ; Lee, Chong-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 285~285
In this study, it was attempted to investigate the magnitude and the distribution of the lateral earth pressure which is occurred by the narrowly back-filled soil in the open cut and fill method to construct the underground box structures such as subway. communication and electricity facilities, and box culverts etc. For that purpose, the experiments were performed in using model test box. The width of backfill. the angle of excavation and the wall friction were changed. Its results were compared with not only those of classical theories but also those of the numerical analysis using Finite Difference Method. in which Mohr-Coulomb model was applied.
Development of Analytical Technique for Drilled Shafts Using Load-transfer Curve Method
Cho, Sung-Han ; Kim, Soo-Il ; Jeong, Sang-Seom ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 293~293
The load distribution and deformation of drilled shafts subjected to axial load are evaluated in this study. An analytical method which is appropriate and realistic to represent a pile-soil interaction is proposed by a load-transfer approach whereas the interaction effect along the piles is approximated by a modified form of Mindlin's analytical point-load solution. The soil is represented by a set of nonlinear load-transfer curves representing the soil resistance as a function of pile displacements at several discrete points along the pile including the point. Finite difference techniques are used to solve the nonlinear differential equations governing compatibility between the pile displacement and the load-transfer along the pile. Through the comparison study, it is found that the prediction by present approach simulates well the general trend observed by the in-situ measurements and thus represents a significant improvement in the prediction of load-deflections of drilled shafts.
Shear Load-transfer Characteristics of Drilled Shafts in Weathered Rocks
Cho, Sung-Han ; Kim, Soo-Il ; Jeong, Sang-Seom ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_3, 1997, Pages 305~305
In this study the shear transfer curves of drilled shafts placed in granite-gneiss rocks were investigated based on small-scale tension load tests performed on nine instrumented piles. Special attention was given to the load-transfer at the interface between shafts and surrounding rocks. For the tension load test. a constant load was applied to the pile and sustained for 15 minutes at each load level. This procedure was repeated until anticipated ultimate load was reached and total of eight load increments was applied. It is shown that the shear transfer curves can be categorized typically into two different types such as hyperbolic and elastic-perfectly plastic models. Based on the analysis, a single-modifed hyperbolic type is proposed for shear transfer function of drilled shafts in rocks through the normalization of transfer curves and linear regression analysis.