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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
An effect analysis of the lower basin floods due to the upper stream development in Youngsan River
Jung, Jae-Wook ; Yi, Jae-Eung ; Kim, Jin-Young ; Yoon, Sei-Eui ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 1~12
This study is a preliminary study to analyze flood effects of the lower basin due to upper stream development in Youngsan River. Floods case study due to land development was investigated. It used a probable rainfall and it investigated the change of flood discharge of the Youngsan River, Three heavy rain which occur recently from the Youngsan River basin is selected and the runoff characteristics against the rainfall is analyzed. If the urbanization speed of present time is advanced quickly from the upper stream development in Youngsan River, peak flow of the Youngsan River middle downstream are augmented, peak time are shortened and the damage of the inundation will be added an extra weight. In addition, floods materials were collected to analyze floods characteristics, and an establishment of countermeasures for flood prevention was suggested for Youngsan River
A Numerical Study on the NATM Tunnel Reinforcement using Centrifuge Model Experimental value
Huh, Kyung-Han ; Kim, Nak-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 13~18
In this study, in the first place, parameters primarily influencing displacement and stress were constructed by using the Finite Difference Method; then using those parameters, the result of crown displacement and convergence among the existing, experimental values of a centrifuge model were compared with the result of numerical analysis; and then considering the stress and time effect of lining installation, parameters according to the difference of stiffness were studied. In the result of this study, it found out that rough, ground reinforcement effect manifests itself when reinforcement propert of the grouting of the big scale steel pipe through 3-D analysis is E= 4,000tf/m2 which of the stiffness of the original ground.
Dynamic Behavior of Unsaturated Decomposed Mudstone Soil Under Low Strain Amplitude
Huh, Kyung-Han ; Chung, Choong-Sun ; Bae, Joong-Seon ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 19~27
The interest in the dynamic properties of soils has increased strongly because of earthquake, heavy traffic, and foundations undergo high amplitude of vibrations. Most of soils in Korean peninsula are composed of granite soils, especially the decomposed mudstone soils are widely spread in Pohang areas, Kyong-buk province. Therefore, it is very important to investigate the dynamic properties of these types of soils. The most important soil parameters under dynamic loadings are shear modulus and material dampings. Furthermore, few definitive data exist that can evaluate the behavior of unsaturated decomposed mudstone soils under dynamic loading conditions. The investigations described in this paper is designed to identify the shear modulus and damping ratio due to a surface tension for the unsaturated decomposed mudstone soils under low and high strain amplitude. For this purpose, the resonant column test and the cyclic triaxial test were performed. Test results and data have shown that the optimum saturated degree of decomposed mudstone soils under low and strain amplitude is
which is higher than that of decomposed granite due to the amount of fine particles as well as the type and proportion of chief rock-forming minerals.
Fire Characteristics of Phenolic Resin for Interial Materials of Passenger Train
Lee, Cheul-Kyu ; Lee, Duck-Hee ; Jung, Woo-Sung ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 29~34
The time to ignition, heat release rate characteristics, and carbon monoxide yield of fiber reinforced and sandwich phenol resin were investigated with cone calorimeter. The fire characteristics of unsaturated polyester, mostly being applied to the existing passenger train, and phenolic resin were compared. DSC & TGA was used to monitor the degree of thermal decomposition and weight loss for the phenolic resin. According to the cone calorimeter data, the time to ignition was shorter, heat release rate, and CO yield was higher as the external heat flux increased. Under the same heat flux, the time to ignition of sandwich type phenolic resin was shorter than that of laminated. The result of comparison between unsaturated polyester and phenolic resin was that phenolic resin was shown to have better fire resistance than unsaturated polyester.
An Experimental Study of Material Characteristics for GFRP Pipes
Han, Taek-Hee ; Kim, Sung-Nam ; Kang, Young-Jong ; Yoon, Ki-Yong ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 35~45
Recently, the composite material becomes more popular and its usage is kept expanding from aerospace to civil structures such as bridge decks and irrigation and drainage pipes. The major cause for the popularity can be found in its high strength, light, and excellent anticorrosive properties. Nevertheless the methods to accurately predict and analyze its structural behavior are extremely limited. This has been the major reason circumventing more prevalent use of the composite materials in civil structures. This study is a pre-study to develop the analyzing models for accurate prediction of the composite material structures. Thus, various tests were performed for GFRP pipes to estimate material characteristics of GFRP in this study. And stress-strain relation of GFRP was suggested as a bilinear relation.
An Experimental Study on Seismic Capacity Improvement of Masonry Buildings by Glass Fiber Reinforced Methods
Cho, Sang-Min ; Choi, Sung-Mo ; Kwon, Ki-Hyuk ; Lee, Su-Cheul ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 47~52
Whereas The masonry buildings are safe under gravity loads, most of the masonry buildings in Korea have many structural defects under a lateral load due to an earthquake acceleration. But there is no earthquake resistant design code for the Masonry in Korea. Therefore it may be necessary to be set up an seismic code and be suggested for reinforcing methods for existing masonry buildings. The purpose of this paper is to investigate seismic capacity of reinforced masonry buildings subjected to earthquake load. The typical two models of the masonry building in Korea are selected through a site investigation. On the basis of test results, the fiber reinforcing effect of the two models was considerable. The maximum base shear force and deformation capacity for RM were remarkably increased. It was found that the pier rocking failure was a dominant mode for the RM buildings during a seismic excitation.
A Study of Manhole Bursting due to Surcharged Flow in Large Sewer System
Choi, Sung-Mo ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 53~59
The mechanism of manhole bursting which occurs at excess rainfall events Is studied by using both the physical model and the numerical model (SWMM ; Storm Water Management Model). The result of numerical simulation to steep pressure rising agrees well with that of the physical model at the sewer system under surcharged flow. A cause of manhole bursting is an expansion and spout of the condensed all at manhole that results from the surcharged flow and press wave propagation caused by gate operation or closure of conduit at pumping station.
Analysis of Drought Detection and Propagation Using Satellite Data
Shin, Sha-Chul ; Eoh, Min-Sun ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 61~69
Drought is one of the mai or environmental disasters. Weather data, particularity rainfall, are currently the primary source of information widely used for drought monitoring. However, weather data are often from a very sparse meteorological network. Therefore, data obtained from the Advanced Very High Resolution Radiometer(AVHRR) sensor boarded on the NOAA polar-orbiting satellites have been studied as a tool for drought monitoring. The normalized difference vegetation index(NDVI) and vegetation condition index(VCI) were used in this study. Also, a simple method to detect drought Is Proposed based on climatic water balance using NOAA/AVHRR data. The results clearly show that temporal and spatial characteristics of drought in Korea can be detected and mapped by the moisture index.
Inundation of Tsunamis Based on Quadtree Grid System
Lin, Tae-Hoon ; Park, Koo-Yong ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 4, issue 2, 2004, Pages 71~76
To investigate the inundation of tsunamis in the vicinity of a circular island, a numerical model has been developed based on quadtree grids. The governing equations of the model are the nonlinear shallow-water equations. The governing equations are discretized explicitly by using a finite difference leap-frog scheme on adaptive hierarchical quadtree grids. The quadtree grids are generated around a circular island where refined with rectangular or circular domain. Obtained numerical results have been verified by comparing to available laboratory measurements of run-up heights. A good agreement has been achieved.