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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 4, Issue 4 - Dec 2004
Volume 4, Issue 3 - Sep 2004
Volume 4, Issue 2 - Jun 2004
Volume 4, Issue 1 - Mar 2004
Selecting the target year
Improved Evaluation for the Seismic Capacity of Concrete Gravity Dams
Kim, Yon-Gon ; Kwon, Hyek-Kee ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 1~14
The objective of this study is firstly to frame up the seismic safety of concrete gravity dams. It is necessary to analyze seismic response and evaluate seismic performance of concrete gravity dams during earthquake. In this study, seismic damage and dynamic analysis of concrete gravity dams using structural analysis package such as SAP2000 and MIDAS were performed. Additional dynamic water pressure due to earthquake considered as additional mass for numerical seismic analysis. According detailed analysis, the vibration through the dam structure (transverse to water flow) seems to be very critical depending on the shape of the dam. For more precise evaluation of seismic fragility of concrete gravity dams, further research is still needed.
An Experimental Study on the dynamic behavior of 4-Span Cable-Stayed Bridge with
Cho, Jae-Young ; Kim, Young-Min ; Lee, Hak-Eun ; Yoon, Ki-Yong ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 15~24
-type girder composed of two I-type girders is known to have a significant disadvantage in wind resistance design because of aerodynamic instability. A representative bridge for this girder was Tacoma Narrows Bridge. Since Tacoma Narrows Bridge had very low stiffness of the bridge structure and its cross-section shape had aerodynamic instability, the bridge collapsed after severe torsion and vibration events in 19m/s wind speed. Aerodynamic vibration can be avoided by enhancing structural stiffness and damping factor and conducting a study of cross-section shapes. This study shows the angle of attack for the four-span cable stayed bridge having
-type cross-section and describes the aerodynamic characteristics of the changed cross-section with aerodynamic vibration damping additions, by carrying out two-dimension vibration tests. As a result of uniform flow and turbulent flow, the study shows that because the basic
-type cross-section alone can have efficient wind resistant stability, there is no need to have additional aerodynamic damping equipment. Since this four 230m-main-span bridge has a large frequency and also has a big stiffness compared to other bridges containing a similar cross-section, it has aerodynamic stability under the design wind speed.
The Development of Rail-Transport Operation Control based on Unsaturated Soil Mechanics Concept
Kim, Hyun-Ki ; Shin, Min-Ho ; Kim, Soo-Sam ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 25~31
Infiltration of rainfall causes railway embankment to be unstable and may result in failure. Basic relationship between the rainfall and stability of railway embankment is defined to analyze the stability of embankment by rainfall. An experimental study for defining of infiltration rate of rainfall into slope is conducted in the lab. The results of Rainfall Infiltration show that rainfall Infiltration is not equal to infiltration as like reservoir because rate of rainfall infiltration is controlled by slope angle. Based on these results, boundary condition of rainfall is altered and various numerical analysis are performed. The variation of shear strength, the degree of saturation and pore-water pressure for railway slope during rainfall can be predicted and the safety factor of railway slope can be expressed as the function of rainfall amount, namely rainfall index. Therefore, it is judged that this rainfall index can be a good tool for the rail-transport operation control.
Multipurpose Dam Operation Models for Flood Control Using Fuzzy Control Technique ( I ) - Development of Single Dam Operation Models -
Shim, Jae-Hyun ; Kim, Ji-Tae ; Heo, Jun-Haeng ; Kim, Jin-Young ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 33~40
The objective of this study is to develop single dam operation models for flood control using Fuzzy control technique, which can improve flood controllability. We set control rules by water level and inflow, and developed three models Fuzzy I, II, III according to rule to decide outflow. Fuzzy I model consists of six rules considering only flood control and Fuzzy II model considers the effect of water use by increasing water level at the end of flood control period as well as flood control during the same period. Finally, Fuzzy m is an adaptive model designed to perform multipurpose dam operation for both flood control and water use simultaneously based on a control rules.
Multipurpose Dam Operation Models for Flood Control Using Fuzzy Control Technique ( II ) - Simulation of Historical Flood Events -
Shim, Jae-Hyun ; Kim, Ji-Tae ; Cho, Won-Cheol ; Kim, Jin-Young ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 41~50
The objective of this study is to investigate the feasibility of the developed Fuzzy control techniques in dam operation. The simulated results for the 1984, 1990, and 1995 flood events are compared with historical operation results in the view of flood control and disaster prevention. The three models developed in this study determine the outflows based on the two conditions the first one is to consider only two inputs such as reservoir water level and inflow, for operation of the existing situations, the second one is that the possible maximum discharge from each dam does not exceed the allowable design maximum discharge for disaster prevention in downstream area. As the results, it was shown that the suggested models based on Fuzzy control technique could reduce both the peak water level and the maximum peak discharge compared with the historical operation results.
Water Quality Management Plan through Mass Balance at Small Urban Stream
Oh, Jong-Min ; Shin, Dong-Hwan ; Choi, I-Song ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 51~56
In this study, the variation of water quality in Osan stream was investigated through continuous monitoring, and mass balance and metabolism occurred into water body were estimated to set up effective management plan for water quality of small urban stream. From the results of continuos investigation of water quality in Osan stream, the things written as follows must be previously done to improve water quality of main stream. Firstly, it need that effective management plan for tributaries must be set up to improve the water quality in main stream. Secondly, the counter plan for re-eruption of pollutants from sediment in main-stream is required to prevent inner pollution. In this study, we showed that small urban stream can be managed effectively by simple investigation to prevent deterioration of water quality. Therefore continuous monitoring for water quality in stream is important to improve water quality, furthermore matter cycle and mass balance happening in the stream environment must be correctly estimated to make up healthy stream environment.
Safety Evaluation of Mountain Slopes Considering the Effect of Forest Fire
Kim, Jong-Min ; Chung, Bong-Hoon ; Choi, Joon-Sung ; Park, Duk-Keun ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 57~64
Recent abnormal weather condition and accompanying increase in forest fire require more study on the effect of forest fire on the stability of mountain slopes. The aims of this paper are to investigate how destroy of trees caused by forest fire influences the stability of mountain slopes and to propose a safety evaluation method for mountain slopes considering the effect of forest fire, in order to minimize the expected damage due to forest fire. To accomplish this aim, the effects of forest fire on the stability of mountain slopes are analyzed in quantitative way, and a slope stability chart is proposed as a result.
Assessment of Geosynthetic Soilbag Method to Restore the Roadbed of Railway
Hwang, Seon-Keun ; Koh, Tae-Hoon ; Park, Sung-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 1, 2004, Pages 65~75
Roadbed failure due to the natural disaster may bring out social and economic damage such as the loss of life and property, the consumption of time and cost for recovery, and the delay of logistics in railway In this study, the method using geosynthetic soilbag was applied to rehabilitation of the railway roadbed which was failed by disaster. The full scale tests with the simulated train loading were performed in order to evaluate the static and dynamic performance at the railway roadbed using geosynthetic soilbag. The results of these tests were compared with unreinforced and reinforced cases with geosynthetic soilbag, respectively The data gathered by various measurement devices from these full scale tests would be useful to evaluate and understand the roadbed with geosynthetic soilbag. In conclusion, geosynthetic soilbag was evaluated as a permanent restoration method to reinforce the roadbed of railway.