Go to the main menu
Skip to content
Go to bottom
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 2, Issue 4 - Dec 2002
Volume 2, Issue 3 - Sep 2002
Volume 2, Issue 2 - Jun 2002
Volume 2, Issue 1 - Mar 2002
Selecting the target year
Flexural Behavior of RC Beams Using High-Strength Reinforcement for Ductility Assessment
Kwon, Soon-Beom ; Yoon, Young-Soo ;
Journal of Korean Society of Hazard Mitigation, volume 2, issue 1, 2002, Pages 119~126
This paper presents the appropriateness for using high strength reinforcement according to the use of high strength concrete. Nine flexural tests were conducted on full-scale beam specimens according to the concrete strength, reinforcement strength and reinforcement ratio as main variable. The structural behavior was analyzed due to the flexural strength, stress-strain curve, deflections at yielding and fracture point, crack appearance and ductility factor. The member with high-strength reinforcements showed large deflection at yielding point and this was analyzed as a main cause to decrease the ductility factor. Structural behavior after yielding point, however, showed similarity to behavior of members with normal strength reinforcements of same stiffness. It was found that in the case of using reinforcements of
strength, the combination with concrete of
strength demonstrated the great appropriateness which can increase the flexural capacity without any reduction of maximum reinforcement ratio.
Evaluations of Recreational and Aesthetical Values for the Cut River Considered as a Wetland
Lee, Sang-Sik ; Kim, Hung-Soo ; Jeong, Sang-Man ;
Journal of Korean Society of Hazard Mitigation, volume 2, issue 1, 2002, Pages 127~134
The cut river is widely used for the agricultural and housing purposes in Korea and this study is to evaluate the economic value of the cut river. Say, the study is to evaluate and compare the economic values for the cases of which the cut river can be used as the agricultural or housing site and a wetland or recreational site. The study area is the downstream part of Kok-Neung stream which is a main tributary of Han River. For the case of assuming the cut river is used as the agricultural purpose, the value is estimated from the Agricultural & Forestry Statistical Yearbook 2000. For the case of assuming the cut river is used as a wetland or recreational site, the value for a wetland or recreation is estimated by the enquete using questionnaire. That is to say, the results of enquete is used for the estimation of a recreational value by the Travel Cost Method (TCM) and the aesthetical value is estimated by the enquete based on the presumed value in USA. As a results, for the case of which the cut river is used as an agricultural purpose, the equal-payment-series is estimated as 7.06 million won. For wetland purpose, the series is estimated as 1931.40 million won and for the recreational purpose, the series is as 6284.86 million won. The aesthetical value is estimated as 140 thousand won per annum. Therefore, the wetland or recreational use of the cut river is more valuable than agricultural or housing purpose.
Analysis of the Characteristics of the Seismic source and the Wave Propagation Parameters in the region of the Southeastern Korean Peninsula
Kim, Jun-Kyoung ; Kang, Ik-Bum ;
Journal of Korean Society of Hazard Mitigation, volume 2, issue 1, 2002, Pages 135~141
Both non-linear damping values of the deep and shallow crustal materials and seismic source parameters are found from the observed near-field seismic ground motions at the South-eastern Korean Peninsula. The non-linear numerical algorithm applied in this study is Levenberg-Marquadet method. All the 25 sets of horizontal ground motions (east-west and north-south components at each seismic station) from 3 events (micro to macro scale) were used for the analysis of damping values and source parameters. The non-linear damping values of the deep and shallow crustal materials were found to be more similar to those of the region of the Western United States. The seismic source parameters found from this study also showed that the resultant stress drop values are relatively low compared to those of the Western United Sates. Consequently, comparisons of the various seismic parameters from this study and those of the United States Seismo-tectonic data suggest that the seismo-tectonic characteristics of the South eastern Korean Peninsula is more similar to those of the Western U.S.
Investigation and Evaluation on Performance of Durability for Freeway Concrete Viaducts in Seoul Metropolitan Area
Lee, Chang-Soo ; Yoon, In-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 2, issue 1, 2002, Pages 143~152
The objectives of this paper were to obtain the fundamental data to analyze the causes of deterioration of 39 freeway concrete viaducts in Seoul metropolitan area. To investigate the degree of concrete deterioration, carbonation depth, soluble chloride concentration in hardened concrete and half-cell potentials of reinforcement were measured. The number of structures which carbonation depth penetrates to reinforcement was 25% of total. The model of carbonation .ate was induced to 3.92
, which was 5% faster than 3.727
assumed 60% water-cement ratio, R=1 in that of kishitani. After measuring chloride concentration in concrete, it was concluded that about 24% of all readings on samples from concrete exceed the critical content to minimize the risk of chloride-induced corrosion. About 31% of the freeway viaducts structures had a value lower than -350mV(vs. CSE), so it could conclude that the excessive chloride concentration was the major cause of reinforcement corrosion. Among the structures which measured half-cell potentials less than -350mV, about 50% exceeds the maximum acceptable limit of chloride concentration.
The Study for the Optimal Location of Fire Stations in Seoul
Kim, Geun-Young ; Kang, Sung-Il ;
Journal of Korean Society of Hazard Mitigation, volume 2, issue 1, 2002, Pages 153~159
Disasters are the phenomena that we have to prevent the occurrence in order to keep the safety to human lives and properties, and if occurred, we have to minimize the economic, social, and mental costs of the occurred disasters or incidents. This research analyzes the optimal location of fire stations in terms of served population maximization in Seoul. This research introduces "the maximal covering location problem(MCLP)," one of the optimization techniques, as the primary research method. This research also applies a geographic information system into spatial distribution analyses of existing fire stations and observed fire incidents. Results from the analyses show that the existing location of fire stations and branches need to be improved. The dispatch location of fire engines should be reconsidered for rapid services of fire fighting.
Statistical Analysis on Danger Period of Forest Fire by Regions in Korean
Kim, Sun-Young ; Lee, Si-Young ; An, Sang-Hyun ; Shin, Young-Chul ; Oh, Jeong-Soo ;
Journal of Korean Society of Hazard Mitigation, volume 2, issue 1, 2002, Pages 161~167
Forest fire danger period in nine Provinces (Gangwondo, Kyonggido, Gyeongsangnamdo, Gyeongsangbukdo, Jeollanamdo, Jeollabukdo, Jejudo, Chungcheongnamdo, Chungcheongbukdo) has turned out to be similar to recognize whether there are some differences between each Provinces, we used correlation analysis with number of occurrence and damage area by an interval of ten-day period. Based on this analysis, there was significant numbers of occurrence at all areas wish serious burns except Gyeongsangnamdo and Jejudo Provinces. Since persuasive power is insufficient as danger period of forest fire applies equally to nine Provinces, statistical analysis using number of forest fire occurrence and burned area are executed. And then, a analysis of variance(ANOVA) test of significance by an interval of ten day period is carried out. As a result of this analysis, there showed significant at 1% level for number of occurrence except Jejudo, and is also showed significant at 1% level for burned area except Gangwondo and Chejudo. Through regional correlation analysis for danger period, we classified three parts of Middle region (Gangwondo, Kyonggido, Gyeongsangnamdo, Gyeongsangbukdo, Jeollabukdo, Chungcheongnamdo, Chungcheongbukdo) Southern region (Gyongsangnamdo, Jeollanamdo) and Jejudo region. With respect to forest fire occurrence time, Middle region showed from the middle of February to first of May that amounts to 81% of entire occurrence in this region, and Southern region begins with at the last of January to the middle of April covering 71%. In terms of forest fire burned areas, it appears at the middle of February to the first of May, occupying 98% in Middle region, and Southern region showed burned areas from the last of January to the middle of April amounting to 82% of total occurrences.