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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Hazard Mitigation
Journal Basic Information
Journal DOI :
Korean Society of Hazard Mitigation
Editor in Chief :
Moo Jong Park
Volume & Issues
Volume 3, Issue 4 - Dec 2003
Volume 3, Issue 3 - Sep 2003
Volume 3, Issue 2 - Jun 2003
Volume 3, Issue 1 - Mar 2003
Selecting the target year
Experimental Performance Characteristics of Crumb Rubber-Modified(CRM) Asphalt Concrete
Kim, Nak-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 89~97
Indirect tensile strength(IDT) test and resilient modulus(Mr) test were performed to evaluate experimental performance characteristics for the conventional and crumb rubber-modified(CRM) asphalt concrete using dry and wet processes asphalt. The IDT test was conducted under three temperatures(5, 10, 20
). According to the test results, it was shown that indirect tensile strength of CRM asphalt concrete was lower than that of the conventional one. However, toughness and maximum vortical strain of the CRM asphalt concrete were higher than those of the conventional one. The results of Mr test were presented that Mr of CRM asphalt concrete was higher than that of the conventional one. In addition, it was revealed that the overall laboratory performance characteristics of the wet-processed CRM asphalt concrete was better than those of the dry-processed one.
Stability Analysis Techniques of Bracing Structure in the Hard Clay Ground According to the Variation of the Groundwater Level at the Trench Excavation
Heo, Chang-Hwan ; Seo, Sung-Tag ; Kim, Hee-Duck ; Jee, Hong-Kee ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 99~110
In this study, lightening material weight and normalizing structure of preventing system of landslide soil-rock in trench excavation was tried with focusing in safety construction availability and workability. In other words, risk estimate, safety management method investigation, applicability of bracing material and mechanical stability of bracing structure was studied. From these result, structural stability and structural analysis of light weight bracing structure was carried out with common structural analysis program, for examining movement mechanism of bracing structure and normalization of standard. The result are summarized as following. (1) Mechanical ability of bracing members and soil pressure parameter acting to member for ensuring mechanical propriety of bracing structural and useful of new material considering soil mechanics boundary were proposed. Also theory and method of analysis of bracing structural were proposed. (2) As a result of the structure analysis of geographical profile for light pannel used FRP as hard clay mechanical characteristics(bending moment, shear force, axial force) of panel were changed according to groundwater level and it is proved that the result of mechanical analysis is within allowable stress. Thus, light pannel is available for bracing structure in trench excavation.
A Development of Rail-Transport Operation Control for High-Speed Railway under Rainfall
Shin, Min-Ho ; Hong, Man-Yong ; Lee, Seong-Hyeok ; Kim, Hyun-Ki ; Kim, Jung-Ki ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 111~118
Korea High-Speed Railway has various safety systems to secure safe and stable transportation and makes assurance doubly sure to minimize casualty and property damage caused by natural disasters. But, there is no regulation that reflects domestic railway line, climate, topographical and geological characteristic in introducing the foreign regulations yet. Therefore, it is necessary for us to modify a regulation which is suitable to domestic high-speed railway. In this study, it is possible to establish more reasonable boundary rainfall by grasping and improving the troubles with existing boundary rainfall that is scheduled to be utilized for high-speed rail-transport operation control under rainfall. Also, it is possible to insure the safety of train by four steps such as 'normal operation', 'warning issue', 'train speed control' and 'train stop' using the established boundary rainfall. It will go far toward minimizing the occurrence of natural disasters.
Analysis of Influence by soil water-characteristic curve and permeability-suction relationship for the water flow in unsaturated soil
Kim, Suk-Nam ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 119~125
Water flow in unsaturated soils is affected by two mathematical equations called soil water-characteristic curve and permeability-suction relationship. Soil water-characteristic curve is an equation showing volumetric water content-suction relationship. Many researchers have presented equations for the relationships. This paper illustrates the importance of correctly determining the two relationships when analyzing unsaturated water flows. Results from two methods, Gardner (1958) and Fredlund et al. (1994), are used for comparison purposes. Numerical simulations of water flow by finite element method are performed using the two methods. The results by the numerical simulations are compared with the field data which was obtained from time-domain reflectometry (TDR) probes in Delaware County, Ohio. This data was obtained by the Seasonal Instrumentation Program which is included as a part of the Strategic Highway Research Program (SHRP).
Ductility of Circular Hollow Reinforced Concrete Piers Internally Confined by a Steel Tube
Han, Taek-Hee ; Han, Sang-Yun ; Han, Keum-Ho ; Kang, Young-Jong ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 127~137
In locations where the cost of concrete is relatively high, or in situations where the weight of concrete members is to be kept to a minimum, it may be economical to use hollow R.C. members. The ductility of circular hollow R.C. columns with one layer of longitudinal and spiral reinforcement placed near the outside face of the section and the steel tube placed on the inside face of the section is investigated. Such hollow sections are confined through the wall thickness since the steel tube is placed. In this study, moment-curvature analyses are conducted with Mander's confined concrete stress-strain relationship. The variables influenced on the ultimate strain is the ratio and yield strength of confining reinforcement and the compression strength for confined concrete. From this ultimate strain - the transverse reinforcement ratio relationship, the transverse reinforcement ratio for circular hollow reinforced columns with confinement is proposed. The proposed transverse reinforcement ratio is confirmed by experimental results.
An Experimental Study on Reduction Effect of Scour Depth arounding Uniform Cylindrical Pier with Various Size of Circular Collar
Sim, Ou-Bae ; Song, Jai-Woo ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 139~145
This study is to propose reduction effect of scour depth and a optimum size of circular collar through experimental analyses with various collar sizes. To do so, we carried out hydraulic model experiments. In the case of with considering the collar, the effect of reduction of scour depth increased according to the increase of collar size. When size of collar is 2 as the ratio of collar diameter(W) to pier diameter(D), scour depth is decreased about 67% and deposition height is increased about 70%. The optimal size of collar proposed in this study is W/D=2 by analyzing reduction effect of scour depth, size of scour hole, and deposition height.
Variation of Hydraulic Characteristics around a Cylindrical Bridge Pier with Circular Collar
Jin, Byoung-Ho ; Sim, Ou-Bae ; Song, Jai-Woo ;
Journal of Korean Society of Hazard Mitigation, volume 3, issue 2, 2003, Pages 147~154
In this study, hydraulic characteristics around bridge piers were analyzed with and without collar through a hydraulic model experiment. The analysis of stage variation in front and back side of pier showed that collar installation did not function as obstacle to the stream flow. Little variation of water level between front and back sides of pier was observed before and after collar installation(0.2cm in front side and 0.1cm in back side of pier). Also, result that analyze velocity variation in front and back side of pier, lateral velocity(u) and transverse(v) before and after collar installation exhibited no alteration in the front and back side of pier. About 16.72% and 15.83% of vertical velocities(w) were reduced for the condition of y/d=0.33 in the front side of pier and y/d=0.67 in the back side of pier, respectively. This experimental results suggest that the collar installation around pier can minimize the local scouring depth by preventing the downflow that cause the pier scour.