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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 10, Issue 6 - Dec 2010
Volume 10, Issue 5 - Oct 2010
Volume 10, Issue 4 - Aug 2010
Volume 10, Issue 3 - Jun 2010
Volume 10, Issue 2 - Apr 2010
Volume 10, Issue 1 - Feb 2010
Selecting the target year
A Study on the Design of Evacuation Route at Subway Station Using Simulation Analysis
Ham, Eun-Gu ; Roh, Sam-Kew ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 1~7
Since subway fire disaster at Daegu, Korea smoke control system and passengers evacuation distance has been focused to reform. Existing smoke control facilities need to expand volume of ventilation capacity however, the complicate subway station structure can hardly react dispersion of smokes from massive subway cabin fire. Smoke flow at platform level move upward thought vertical stairway and passengers evacuation goes with same direction. The victims of evacuees from subway station fire mainly due to exposure of heat radiation and smoke. The study demonstration the effect of downward evacuates stairway system by separating evacuation route to smoke movement pass way including saving times of evacuation.
A Study on the Effects of Fire-Resistant Coating Materials for Prevention of Concrete Spalling
Jeong, Eui-Dam ; Song, Myong-Shin ; Kang, Hyun-Ju ; Kang, Seung-Min ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 9~15
Recently, the high-compressive strength concrete where the use is extending was weak in fire because of spalling that was occurring with rise of internal vapor pressure by high temperature. For preventing spalling of high-strength concrete in fire, Organic fibers have been using in concrete generally. By melting of organic fibers in concrete in fire, the internal moistures of concrete moves quickly to the outside, and so, preventing of spalling of high-strength concrete. But this method will be able to prevent the spalling of high-strength concrete, but makes the decrease of the concrete strength after fire. This study make a comparison between properties of preventing of spalling and remaining compressive strength of concrete using intumescence Alkali-Silicates fire-resistant material and that of concrete with organic fibers. Using organic fibers for preventing of spalling of concrete are P.P and Nylon fibers, and anti-fire intumescence material for protection of concrete surface is alkali-silicate materials. Fire resistance test executed as long as 3 hr under the flame temperature
over. In the case of concrete with P.P fibers, don't occurred the spalling, but the remaining compressive strength will not be able to measure, the concrete using intumescence Alkali-Silicates system fire-resistant material is not only preventing of the spalling but also the remaining compressive strength maintained until the maximum 96%.
A Study on the Watertightness Improvement of Cementitious Material for Durability Improvement of Concrete
Kang, Hyun-Ju ; Song, Myong-Shin ; Jeong, Eui-Dam ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 17~25
We studied on the watertightness improvement of cementitious material for durability enhancement of concrete. For improvement of watertightness of OPC and OPC with fly ash, we used various materials with watertightness properties to OPC and OPC with fly ash. The performance of watertightness improvement of cementitious materials closely related to formation of CSH by pozzolanic reaction and to reducing of size of contact angle in cement pore by using organic fatty acid. And volume of CSH formation at early hydration have an influence of watertightness improvement and reduction of long-term water absorption rate. In using of fly ash, improvement of workability by using the spherical fly ash caused to densify on the structures of cement material and CSH formation by pozzolanic reaction and cement using fly ash also caused watertightness improvement of cementitious materials. For improvement of concrete durability by watertightness, cementitious materials need using watertightness materials and at using fly ash, also it have to the effect of improvement of watertightness of cementitious materials by pozzolanic reaction.
An Experimental Research to Evaluate Structural Capacity of Pre-stressed Concrete Beam connected with Embedded Steel Plate
Lee, Kyoung-Hun ; Kim, Jeom-Han ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 27~33
In this study, a monotonic loading test to estimate structural capacity of 12 meter long full scale precast pre-stressed concrete beam specimen was performed with a 2,000 kN dynamic actuator. A couple of embedded steel plate was installed at the ends of the beam and specimens were connected to steel girder frame with high tension bolts. Nominal compressive strength of pre-stressed concrete beam and slab were 50 MPa and 24 MPa respectively. Two HD25 tensile steel reinforcements were welded on vertical plate of embedded steel plate. Pre-stressed concrete beam specimen was loaded by displacement control method with a certain loading pattern which was repeated loading and unloading with 10mm increment displacement. About 88.34%, 86.97% and 66.83% of displacement restoration ratios were evaluated at elastic, inelastic and plastic behavior region of specimen respectively.
Reinforced Performance Evaluation of RC Slab Bridge Using Conclinic Advanced FiberWrep
Park, Soon-Eung ; Park, Moon-Ho ; Lee, Tack-Woo ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 35~40
The present study proposes the strengthening method to use Conclinic Advanced FiberWrep(CAF) so as to improve Load Carrying Capacity of the RC slab bridge. In order to evaluate the strengthening performance, we strengthen 50cm per unit-width of CAF to the slab's bottom of the test bridge that designed with DB 18, then perform Static and Dynamic Field Load Test. As a result of this, 14.7% of the maximum displacement, 5.0% of the strain and 33.7% of the impact factor are reduced after strengthening. At the middle of the test spans, nominal resisting ratio is increased by 27% and Service Load Carrying Capacity is increased by 44.6%, 48.9% of each span 1 and 2. In conclusion, this study indicates that the strengthening method using CAF is very effective to improve the deteriorated RC slab bridge designed with DB 18, to the DB 24 of the first class bridge design load.
Simplified Evaluation Method for Residual Bond Strength of Reinforced Concrete Using Standard Fire Curve
Moon, Do-Young ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 41~47
For the enhancement of structural safety of thermally damaged reinforced concrete structure, rapid evaluation of damage in the structure is very important. This study addresses a simplified method which is equivalent to the standard fire curve (ISO 834) for the residual bond strength evaluation. In the proposed method, a exposure duration as well as the maximum temperature can be considered. For the comparisons with conventional methods, concrete properties obtained from the report of Daegu subway fire accident were referred and the results support the applicability of the proposed method in this study.
Study on the Disaster Prevention System for Wooden Cultural Assets Using USN -Focusing on the System Checking the Malfunction of Flame Detector-
Back, Min-Ho ; Kim, Jeong-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 49~54
The wooden cultural assets have the characteristics such as the fast spread of flame and leading to total destruction. Therefore, there is a need for a system for early countermeasure of recognized problem, along with the technological response for accurately recognizing the situation, for the prevention and early suppression of fire. To utilize such technology for detecting the situation through the latest ubiquitous technology and for a quick response to suppress fire, the ubiquitous sensor network (USN) technology, flame detector, image sensor, USN-based cultural asset disaster prevention management application case and malfunction identification system realization were examined in this study and the study result was presented focusing on the flame detector malfunction identification system for the ubiquitous-type cultural asset disaster prevention system.
A Study on the Improvement Plans of Disaster Response Capabilities for U-city
Park, Hee-Soon ; Lee, Jeong-Il ; Yoon, Hyung-Goog ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 55~66
As people's living standards and expectations for life increase, by applying advanced technology in the city, to enhance the convenience and safety needs are being expanded gradually. Accordingly, so the future of the city to see a viable alternative to that the ubiquitous city fused information communication technologies, large-scale projects conducted at the national level. Sectoral Disaster Prevention is ready for sure how much the lack of response capabilities in the field for checking solution has been suggested for The National Emergency Management Agency. These results present a Sectoral Disaster Prevention response capabilities somewhat different in were identified. Through these are proposed policy recommendations about Sectoral Disaster Prevention and insufficient areas of step response capabilities and building fire protection system approach combines ubiquitous technology in the new paradigm rather than traditional disaster management, greet era of ubiquitous.
A Study on the Evaluation Model of Disaster Risks for Earthquake : Centering on the Cases of Cheongju City
Jeong, Eui-Dam ; Shin, Chang-Ho ; Hwang, Hee-Yun ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 67~73
Relatively high density of population and buildings exists in urban area mainly because of broad job opportunities and conveniences available. In other words, if happened, there might be high possibility of disaster which can not be easily recovered. The purpose of this study is to show evaluation approach of the risk degree resulted from the disaster, which considers the attributes of urban area. Cheongju-city in Chungcheongbuk-do is selected as sample district to be estimated. The degree of overall risk including fire risk, building collapse risk, evacuation risk and gas explosion risk etc. is analyzed in the designated area. The analysis suggests the highest risk degree in Bukmun-ro district which also shows CBD decline phenomenon. Therefore, it can be not only predicted that this area as old downtown has not been provided with disaster prevention operation and urban renewal project, but also judged that administrative assistances for the disaster are required possibly soon.
Thermal Characteristics of Living Leaves in Pinus Densiflora with Heat Flux
Park, Young-Ju ; Lee, Hae-Pyeong ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 75~82
To study the combustion characteristics of forest fuel by fire intensity, the experiment of combustion characteristics on Pinus Densiflora living leaves, which is the weakest species to the forest fire, was delivered, using variables of heat flux(25 kW/
, 50 kW/
, 75 kW/
). With the equipment of Cone calorimeter, the characteristics of ignition, heat, smoke release, CO and
release, and mass loss were analyzed. Pinus Densiflora living leaves containing moisture of 60.66% were not ignited at the heat flux of variables 25 kW/
, 50 kW/
, 75 kW/
. In proportion to the heat flux value, heat release amount and heat release rate reached maximum value rapidly: higher variables came to the maximum by the half rapidity and the maximum value were twice higher than the former lower variables respectively. As for the smoke release, the less heat flux the variable had, the more smoke release it had, due to incomplete combustion. The release amount of CO and
had more maximum value as the heat flux increased and more radiant heat meaned more carbon oxide. When the forest fire breaks out, therefore, a great amount of CO and
will be released by Pinus Densiflora.
Consideration about the Fire Lane Plan and the Conformability - A Case Study on Daegu Metropolitan City Buk-gu -
Jeong, Gun-Sik ; Kim, Han -Su ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 83~90
The purpose of this study is to establish the standard of fire lane design to improve the performance of disaster prevention in local area. To accomplish it, we have focused on three research methods as below: first, we have expected disaster occurrence based on emergency tendency in local area; second, we have verified fire lane routes design through fire lane modeling and network analysis; third, we have quantitatively examined a possibility of danger of fire lanes through current road network modeling and analysis. The result of this study could be helpful to effective fire lane designs and quantitative analyses.
A Study on the Seriousness of Asbestos Exposure and Improvement of Working Conditions of Fire Officials
Lee, Jung-Il ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 91~96
In the various disaster scene effective protective equipment and suppression measures of crisis response cases that is closed all in Korea. Due to asbestos exposure by wearing protective equipment, as well as thoroughly strengthen firefighting, recognize the seriousness of the hazard factors in the fire activity, and established legal system for disease compensation and supplemented by institutional for diseases not yet recognized by officially recognized disaster, fire officials to improve morale and working conditions can be expected to improve major public service.
A study on the Fosterage Finance Cooperative System Considering the Characteristics of Fire Protection Industry
Jung, Jung-Ki ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 97~108
Recent patterns of diversification of a disaster, depending on the size of the larger trend, quick and efficient response to disaster prevention, to increase the importance and role of advanced equipment and technology of fire protection industry is becoming more, over market size 11 trillion won and 10 million workers in industries of national importance, but to exceed, As most SMEs compared to other industries are backwardness. Therefore, in this study closely the characteristics of the fire protection industry analysis, the systematization of theoretical models of the finance cooperative system considering the characteristics of fire protection industry and provider the fosterage, they will contribute to independent economic activity and industrial development for operators to use the finance cooperative system of fire protection industry.
The Experimental Study on Mass Nail Reinforcing Effects with Variation of Water Content
Kwon, Kyoung-Jun ; Kim, Won-Il ; Hong, Chang-Sun ; Ahn, Won-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 109~116
Infiltration and the rising level of groundwater caused by rainfall are a major cause of the landslide and sliding. In order to secure the safety factor of slope, the slope stabilization and reinforcement works are used to enhance consistency. Nailing, Slope Drainage method and the surface vegetation measures can be simultaneously applied in the Mass Nail method, which is also environmental friendly reinforcement method. To demonstrate the reinforcement effect of a strengthened slope by Mass Nail, the changes in water contents by rainfall were considered while performing Scale Model Test. As a result, safety factor of reinforced slope was about 1.4~2.3 times increased on the unstrength slope. In the case of increasing water content 10% to 22%, The maximum stress was reduced to 12%~24% at the average rate of 18% on the unstrength slope and the reinforced slope by the Mass Nail Method was reduced to 4%~23% at the average rate of 14%.
Analysis of the Characteristics of the River Bed Variation by Flow Direction Changes at a Channel Junction
Choi, Gye-Woon ; Ahn, Kyung-Hoon ; Jung, Jae-Kawng ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 117~124
Most of the rivers which exist in nature are not a single river but the network that is composed of several branches and mainstreams. The river network are more complicated than other sigle rivers and streams. Therefore the hydraulic characteristics are sensitively changed by reduction and expansion of the width in the confluence or the variation of the flux. In this paper, the hydraulic characteristics were calculated by the change of the width and length in the confluence and the hydraulic model test. The deposit of confluence emerged at the left bank, right bank and the stagnation sector. As the total flow in the branch have increased, stagnation of the left bank and right bank have decreased. When the width of the downstream have been get smaller from 3 m to 2 m, the deposit of the left bank and right bank and stagnation sector have decreased. But as the eddy flow in the center of the confluence is occurred, the erosion has been increased. The result of this paper can be used as a basic data of water management around the junction and for maintenance on the ground of development of the river.
Investigation of Flow Characteristics of Sharply Curved Channels by Using CCHE2D Model
Kim, Yeon-Su ; Jang, Chang-Lae ; Lee, Gi-Ha ; Jung, Kwan-Sue ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 125~133
In general, curved bends raises a risk of overtopping due to floods and also threatens a bank safety due to a local flow concentration. This study aims to test the applicability of CCHE2D model for experimental flumes with two different types of bends and then investigate flow characteristics in the sharply-curved bend of a natural channel. The results demonstrated that the percent error of water level was within 4.9% for experimental flume applications and the simulated spatial distribution of velocity matched the observed results very closely. The calibrated model based on the experimental flumes was also applied to analyze the flow characteristics in natural channel bends of the Daeyu reach, located in a downstream of the Youngdam Dam. The results showed that in upstream, the simulated water level by the CCHED was observed at 1.5 m higher than the 1-D numerical model (HEC-RAS) result since the HEC-RAS could not represent the bend geometry effect on streamflow. However, the calculated results by several empirical formula support that the CCHE2D is suitable for the super elevation simulation as well as flood stage and velocity in a natural channel bend.
Probability of Performance Failure and Change of Roughness Coefficient According to Accumulation of Debris in Storm Sewer
Kwon, Hyuk-Jae ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 135~141
Reliability model which can calculate the probability of performance failure of storm sewer was developed considering change of roughness coefficient in this study. Roughness coefficient should be re-evaluated due to accumulations of debris in sewer pipe. Therefore, roughness coefficient according to depth of debris in circular sewer pipe was determined for the present study. Reliability analysis was performed with the new roughness coefficient. After the analysis, it was found that capacity of storm sewer can be significantly decreased and probability of performance failure of storm sewer can be significantly increased by increasing the depth of debris in storm sewer. In this study, reliability model was applied for the Daegu and Jeonju using new roughness coefficient which was determined according to accumulation of debris in circular storm sewer. It was observed that if the depth of debris is increased, roughness coefficient is increased simultaneously and probability of performance failure of storm sewer is significantly increased.
Distributed Rainfall-Runoff Analysis of Urban Basin with GIS Technique and Network Analysis
Ryu, Hee-Sang ; Kim, Mun-Mo ; Kim, Young-Sub ; An, Won-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 143~148
In this study, the mixed model of the surface rainfall-runoff analysis using grid data and Illudas model was applied to the urban watershed of Bulgang river. After the surface rainfall-runoff was estimated with GIS data, the runoff hydrograph was calculated using network analysis at Jeungsan bridge, which is the final output of watershed. Estimated runoff hydrograph in this study was compared to the observed runoff hydrograph which is converted from the water stage at Jeungsan bridge. The relative errors of total runoff volume and peak discharge showed the range values of 11.70%~16.30% and 1.10%~6.96%, and then the difference of peak times had the values of less than 1 hour for 4 storms. Therefore, the mixed model in this study could be considered to estimate the runoff hydrograph for the prevention of disasters in urban watershed.
Inundation Analysis of Suyoung.Mangmi Lowland Area Using SWMM and FLUMEN
Kang, Tae-Uk ; Lee, Sang-Ho ; Jung, Tae-Hun ; Oh, Jai-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 149~158
Recent rainfall patterns in Korea show that both of the total amount of rainfall and the total number of heavy rain days have been increased. Therefore, the damage resulted from flood disaster has been dramatically increased in Korea. The purpose of the present study is to analyze flooding in an urban area using SWMM linked with FLUMEN. The study area is Suyeong-Mangmi lowland area, Busan, Korea. Suyeong-Mangmi lowland area have been a flooding hazard zone since 1995. The last flooding cases of this area occurred on July 7th and 16th, 2009, and the later flooding case was analyzed in this study. The first step of computation is calculating flow through storm sewers using the urban runoff simulation model of SWMM. The flooding hydrographs are used in the inundation analysis model of FLUMEN. The results of inundation analysis were compared with the real flooding situation of the study area. The real maximum inundation depth was guessed by 1.0 m or more on July 16th. The computation yields the maximum inundation depth of 1.2 m and the result was somewhat overestimated. The errors may be resulted from the runoff simulation and incapability of simulation using FLUMEN for flow into buildings. The models and procedures used in this study can be applied to analysis of flooding resulted from severe rainfall and insufficiency of drainage capacity.
Experimental Study of Freshwater Discharge and Saltwater Intrusion Control in Coastal Aquifer
Suh, Seong-Kook ; Oh, Chang-Moo ; Kim, Won-Il ; Ho, Jung-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 5, 2010, Pages 159~168
This study investigates the relationships between the maximum freshwater pumping discharge and hydraulic properties of coastal aquifer using a laboratory model. The experiment performed the fresh pumping test in various locations near the saltwedge induced by saltwater intrusion to freshwater over aquifer characteristics of hydraulic conductivity, salinity, and ground surface slope. Saltwater pumping also tested to protest saltwater intrusion to the excessively discharging freshwater well. The maximum freshwater discharges were achieved, and then the optimum saltwater discharges were measured. It is found that greater hydraulic conductivity and ground surface slope produced greater the maximum freshwater pumping discharge. Salinity gave less impact on the pumping discharge relatively. Higher freshwater discharge was found at higher hydraulic conductivity and steeper ground surface slope. The optimum saltwater discharge required 14% more pumping rate than the maximum freshwater discharge to keep saltwater intrusion to the freshwater pumping well. Pumping well located closer to salt-wedge profile promoted less freshwater pumping discharge. Therefore, pumping well location, hydraulic conductivity, ground surface slope, and salinity should be taken into account in freshwater pumping in coastal aquifer.