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 8, Issue 6 - Dec 2008
Volume 8, Issue 5 - Oct 2008
Volume 8, Issue 4 - Aug 2008
Volume 8, Issue 3 - Jun 2008
Volume 8, Issue 2 - Apr 2008
Volume 8, Issue 1 - Feb 2008
Selecting the target year
A Study on the Flexural Capacity of Reinforced Timber Beams with the Inserting Method of CFRP Plates
Kwon, Ki-Hyuk ; Yu, Hye-Ran ; Lee, Jin-Hyuk ; Choi, Min-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 1~7
When historical or cultural buildings need to be repaired or reinforced, the changes of original features should be minimized, and the strengths of structures should be improved. Among the existing methods to reinforce historical wood structures, the carbon fiber reinforcement polymer (CFRP) installation method is one of the best ones to achieve the afore-mentioned requirements. Therefore, this study aims at investigating the reinforcing effects and failure modes of timber beams reinforced with the inserted CFRP, a part of roof trusses in modern wood structures, and at providing the fundamental test data to estimate the CFRP rein-forced timber beam in the application of this reinforcing method. The primary parameters in this study were the layout and amount of CFRP. It was observed that, when
of CFRP were installed, the strengths of reinforced timber beams increased up to 173% compared to its original strength, but their strengthening effects were heavily influenced by the characteristics of timber such as burls. In order to improve the applicability of this strengthening method, fundamental understandings on the characteristics of wood would be necessary, and there would be in need of researches on the non-destructive test for wood structures as well.
Distribution of Wheel Loads on Curved Steel Box Girder Bridges
Kim, Hee-Joong ; Lee, Si-Young ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 9~14
In the case of horizontally curved bridges, the use of curved composite box girder bridges are increased due to its functionality and for aesthetical reason. As it compared with the open section, the steel box girder bridges have advantages to resistant of distortion and corrosion. In practice the grid analysis is conducted by utilizing only the cross beam. Since the stiffness of the concrete slab is not included in the grid analysis, the cross beam is induced the distribution of the live load. In this study the affects of the radius of curvature, the number of diaphragm and cross beam to the load distribution of the curved steel box girder bridge was investigated by applying the finite element method. The results indicate that the curvature of curved bridge had a large affect of the load distribution and as the curvature was increased the load distribution factor was increased. A single diaphragm at the center of girder is important role for the load distribution effects and structural stability, but additional diaphragm did not affect it as much. The affects of the cross beam to the load distribution were investigated and its influence was minor. It can be safely concluded that the addition of cross beam does not aid the purpose of the live load distribution. And the stiffness of concrete slab for the load distribution effects should be concerned in the design of curved steel box girder bridges.
Parametric Study on Seismic Performance of Internally Confined Hollow CFT Column
Yeom, Eung-Jun ; Kim, Hyun-Jong ; Han, Taek-Hee ; Kang, Young-Jong ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 15~21
The internally confined hollow-concrete filled tube (ICH-CFT) column has two tubes on the both sides (hollow part and outer part) of the concrete. The inner tube and the outer tube perform great seismic abilities, ductility and absorption of energy due to the steel tubes and the hollow part. So, the study of this column type for the practical use is needed. In this study, the qualitative analysis about seismic capacities depending on parameters is performed for the practical design of the ICH-CFT column. The parameters are diameter of column, hollow ratio and thickness of tubes with the same resistance of the moment. Also, the economical evaluation of ductility and comparison with CFT column make this study to be of practical use. Especially, a change of seismic performance depends on the hollow ratio and the thickness of the outer tube, and the economical hollow ratios according to the thickness of the outer tube in the ICH-CFT column are suggested.
Analysis of Railroad Accidents due to Track Defects in Foreign Countries
Lim, Nam-Hyoung ; Lee, Woo-Chul ; Choi, Jin-Yu ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 23~29
The railway system is worldwide recognized as a safe mean of transportation. However, railroad accidents and incidents continue to occur. Due to the nature of the railway system that consist of many mechanical parties, it is apparently difficult to eliminate probability of accidents and incidents completely. Therefore, through the analysis of railroad accidents and incidents, it is very important to trace the various factors affecting the accidents and incidents. In this study, we performed the analysis of rail-road accidents due to track defects in foreign countries; United States of America, England, Canada, Australia. As a result of its investigation of the accidents, major risk factors are proposed in this study.
A Study on Traffic Impact Assessment Method using Microscopic Simulation Model
Shin, Dae-Sup ; Lee, Seon-Ha ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 31~37
Traffic flow which is prescribed under previous traffic effect/access act is analyzed by traffic volume, V/C, mean speed on road and LOS on the intersection. These indexes based on analytical method can not consider stochastic characteristics of traffic flow. Moreover it is hard to analyze traffic flow visually in whole traffic effect area because only individual road and intersections are targeted. In this study, it is devised to show traffic flow analysis method within traffic effect area visually applying microscopic-simulation by car-following theory, and then based on this, effect analyze ways are studied according to space range plan, improvement measure establishment and etc. To execute this study, effect area is set up using V/C, and the change of traffic current around development area is analyzed using microscopic-simulation program.
Effects of Moving Dynamic Vehicle Loads on Flexible Pavement Response
Jo, Myoung-Hwan ; Kim, Nak-Seok ; Nam, Young-Ho ; Im, Jong-Hyuk ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 39~45
The most important elements in flexible pavement design criteria are stress and strain distributions. To obtain reasonable stress and strain distributions in pavements, moving wheel loads must be applied to analyze the pavement responses. In this study, finite element analysis was used to identify the three-dimensional states using the vehicle load into a constant-position / time-variable load (25, 50 and 80km/hr). In an elastic system, the strain is the same in both longitudinal and transverse directions under a single wheel. However, the same is not necessary in a viscoelastic system. Test results showed that the maximum values between transverse and longitudinal strains the bottom of asphalt concrete base layers under 25km/hr were were about 40 percent.
Analytical Evaluation on the Structural Safety of Horizontally Curved Parts of Buried Pipe
Jeon, Jin-Su ; Kim, Sung-Nam ; Han, Taek-Hee ; Kang, Young-Jong ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 47~55
Recently, it has been reported that buried pipes' crack is concentrated on curved parts. In this study, 3D-Finite element analysis is performed for Analytical Evaluation on the Structural Safety of Horizontally Curved Parts of Buried Pipe. The constructed pipe cracked in curved parts of pipe is analyzed and all kinds of loads affected to buried pipes are considered. Displacement, stresses and buckling analysis are performed. The stress analysis shows that stress in curved parts is larger than stresses in straight parts and exceeds allowable stress in some parts. So, stress analysis on curved parts is needed for safety for buried pipe.
Disaster Experiences and Perception of Older People in Gangwon Province: A Comparison of Elderly Men and Women
Chung, Soon-Dool ; Ki, Jee-Hye ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 57~62
This study aimed at investigating elderly people's experiences and perception of flood disasters in Gangwon province, which is mainly devastated by flood disasters, and seeking to the coping strategy against vulnerability of disaster between elderly men and women. A total of 183 elderly people aged 60 and over who were directly or indirectly damaged by flood disasters of 2006 in Pyung-chang and In-je in Gangwon province were selected for this study. According to the study results, there were no statistical differences in disaster experiences between elderly men and women, however, a statistically significant difference was found in the perception of disaster among them. Although elderly women are more likely to perceive the possibility of secondary flood disasters than elderly men, elderly women are less knowledgeable than elderly men in disaster attacks and they have appeared to have low coping skills. This study showed that elderly women were more likely to live alone than elderly men and they have low income comparing to the elderly men. In conclusion, elderly women should be considered as a most vulnerable group to the disaster and gender-based approach is necessary to take measures in disaster prevention.
Developing Slope Investigation Technic of Underwater Facility using MBES
Kim, Dong-Moon ; Park, Jae-Kook ; Park, Hyeong-Keun ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 63~69
It has an important meaning that the maintenance and management of facility for a onshore construction shall be damaged by oceanic environment. A movement and displacement of these shall be investigated by up-to-date machinery tools like GPS and Lidar and MBES & Gyro. In current a lot of tools and methods for investigation shall be used as a displacement and movement on land mainly. For underwater facility it is very difficult to check because of special conditions below the water surface. In this study, a surveying methods for a movement and displacement of underwater facility as caisson shall be used, i.e. multibeam-echo-sounding system. A possibility as basic data for displacement and environmental monitoring shall be studied by MBES to acquire a caisson's inclination.
Mortality in Pine Stand and Vegetation Recovery after Forest Fire
Lee, Si-Young ; Jun, Kye-Won ; Lee, Myung-Woog ; Chun, Kun-Woo ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 71~79
To find out the effect of the vegetation recovery and the problems of forest land, the researches of the mortality in pine stand and vegetation recovery have been carried out from the burned site. In area which is damaged by fire scar on crown and stem, rate of dead is higher. Where stand growing stocks were totally damaged by crown forest fire, most of vegetation was recovered by sprouts and planted seeds. Vegetation recovery power were depending on the condition of soil depth condition. For the artificial recovery, the damage happened by insects in the planted birches plantation. Rate of growth was somewhat different between Pinus densiflora and Pinus thunbergii in the plantation, because of individual growth rate.
Back Analysis for the Properties of Cut and Cover Tunnel using Optimization Algorithms
Park, Byung-Soo ; Jun, Sang-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 81~87
This study is about the back analysis to optimize the uncertain parameters of geotechnical properties used in stability analysis of cut and cover tunnel. The Simplex algorithm, Powell algorithm, Rosenbrock algorithm, and Levenberg-Marquardt algorithm are applied for artificial problems of ground excavation. Furthermore, results are compared in the matter of the reliability of optimal solutions with a certain accuracy and the computation speed for evaluations of variables. As shown in results of numerical analysis, all of four algorithms are converged to exact solution satisfying the allowable criteria. And Levenberg-Marquardt's and Rosenbrock's algorithms are identified to be the more efficient methods in the evaluations of functions. After the back analysis for Poisson ratio and Young's modulus for cut and cover tunnel has been performed, design parameters have been correctly estimated and computation time has been improved while the number of measure points is increased.
Lateral Earth Pressure with The Shape of Narrow Space with Backfill
Huh, Kyung-Han ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 89~96
The study, with regard to unsymmetrically inclined backfilled wall, was intended to estimate the lateral earth pressure, develop the equation for lateral earth pressure and eventually identify the mutual behavior, based on the modified Kellogg theory, while changing the width between the walls, wall angle, relative density and wall friction angle. To verify the geostatic pressure obtained from the study, the results in the wake of 62 kinds of model tests performed were compared and evaluated with the behaviors based on theoretical equations. As a result, the wall inclination angle was found to be the factors affecting the earth pressure the most, when both walls were inclined unsymmetrically. And the narrower the backfill space and the larger the wall inclination angle to the horizontal level, the greater the effect of the wall friction. The equation considering the wall friction reaction indicated the value, which was closer to the actually-measured earth pressure, and when the width between the warts was narrow, the arching effect appeared to be great, thereby indicating the difference between the measured earth pressure, theoretically calculated earth pressure and the geostatic pressure proved to be insignificant.
Runoff Estimation with Consideration of Land-Use Distribution
Son, Kwang-Ik ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 97~102
The Natural Resource Conservation Service Curve Number(NRCS-CN) method is one of the widely used methods for computation of runoff from a basin. However, NRCS-CN method has a weak point in that the spatial land use distribution characteristics are ignored by using area-weighted CN value. This study developed a runoff estimation algorithm which can reflect the spatial land-use distribution. The algorithm consists of Moglen's theory and a developed flow accumulation estimation program in FORTRAN. Comparisons between the results from area-weighted CN method and this study showed reasonably good agreement with measured data of experimental watersheds. The developed program predicted lower runoff than the conventional NRCS-CN method. As a conclusion, this study proposes a new design direction which can simulate real runoff phenomena. And the developed program could be applied into runoff minimization design for a basin development.
An Analysis of Streambed Changes Downstream of Daecheong Dam
Seo, Hyeong-Deok ; Jeong, Sang-Man ; Kim, Lee-Hyung ; Choi, Kyu-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 103~108
Riverbed change is greatly influenced by artificial factors such as dam construction, gravel collection, and river improvement. This study simulated a long-term bed change based on the GSTARS3 model using actual data from the area downstream of the Geum River Daecheong Dam and compared the estimation with a section of the actual measurement. As a result, it was found that the section of the actual measurement was far lower than the result of the simulation in terms of long-term bed change. While the area downstream of Daecheong Dam displayed approximately an average of 2.29 m of streambed degradation on average while the upper stream area showed approximately 0.63 m of bed degradation over 24 years. In the simulation of the area downstream of Daecheong Dam based on the GSTARS3 model, similar bed degradation was observed. However, a great difference was detected between the result and the actual measurement. According to the cause analysis, the riverbed in the area downstream of Daecheong Dam has continuously degraded due to the dam construction and mass collection of gravel. The mass collection of gravel was the main cause of riverbed change. It was found that about 76% of all riverbed degradation was caused by the mass collection of gravel.
Improvement for Gutter Design Method in Sloping Area
Lee, Young-Dai ; Kim, Jong-Soon ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 109~115
Malfunction of gutter systems in the slope area accelerate to percolate surface flow into underground and to cause the decrease of soil strength, Overflowing from gutter causes soil erosion from slope surface, secondary it is one of the main reasons to cause disaster in the hillside area. Much researches were reported and are undergoing about flood disaster in the down stream area, but rare in the upper reach(hillside). It is considered that improving function of gutter in the hillside is very important to prevent the disaster caused by rainfall. In this paper, After analyzing relationship between rainfall and disaster on the hillside in Busan, researches about having surface flow run into gutter effectively and preventing from overflowing outside of gutter on the hillside in Busan were carried out. Improved design methods of gutter are suggested to mitigate disaster in the sloping area by analysis of collected data and hydraulic model test.
Estimation of Optimum Flow Needed for Fish Habitat by Application of One and Two Dimensional Physical Habitat Simulation Model - Focused on Zacco Platypus -
Oh, Kuk-Ryul ; Lee, Joo-Heon ; Choi, Gye-Woon ; Kim, Do-Hee ; Jeong, Sang-Man ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 117~123
In this study, PHABSIM which is a sample for 1D physical habitat and River2D, which is a sample for 2D physical habitat were applied to the main streams of Han River in order to calculate an optimum flow considering the habitats of fishes in determining the instream flow. Moreover, the Weighted Usable Area (WUA) of the two samples in each growth step (adults and spawning) of the target fish type was compared and reviewed. The optimal flow value was calculated by considering the conditions for inhabiting fishes. As a result of the correlation analysis for WUA from 1D and 2D samples was 0.87 to 0.99. The optimum flow considering the conditions of inhabiting fishes showed insignificant difference of
with the exception of adults in Moon-Mak and spawning in Dal-Chun.
Research of Disaster Surveying for Breakwater using MBES
Park, Hyeong-Geun ; Park, Jae-Kook ; Kim, Dong-Mun ; Yang, In-Tae ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 125~131
A lot of breakwater shall be damaged by typhoon and ocean wave under construction. Construction company shall sign up for onshore & offshore construction insurance regarding disaster. But in case of breakwater it is very difficult to calculate exactly about damaged quantity. In research effective quantity for disaster survey shall be investigated and calculated by multibeam bathymetric survey.
The Solution of Mild-Slope Equation using Power Series
Jung, Tae-Hwa ; Lee, Seung-Oh ; Park, Jin-Ho ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 133~138
To analyze incident waves traveling from the deep ocean is very important in that it is based on resolving problems occurred in coastal areas. In general, numerical models and analytical solutions are used to analyze wave transformation. Although a numerical model can be applied to various bottoms and wave conditions, it may have some cumbersome numerical errors. On the other hand, an analytical solution has an advantage of obtaining the solution quickly and accurately without numerical errors. The analytical solution can, however, be utilized only for specific conditions. In this study, the analytical solution of the mild-slope equation has been developed. It can be applied to various conditions combing a numerical technique and an analytical approach while minimizing the numerical errors. As a result of comparing the obtained solutions in this study with those of the previously developed numerical model, A good agreement was observed.
A Novel Disposal Methods for Unsanitary-Landfilled Wastes at Residential Development Sites
Son, Young-Gyu ; Lee, So-Young ; Kim, Lee-Hyung ; Khim, Jee-Hyeong ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 139~143
Recently, detections of huge amount of wastes in the unsanitary landfills at a residential development sites were reported. Because the sites were the residential development sites, all landfilled wastes should be removed for the constructions. Therefore the way that the unsanitary landfills were excavated and then the wastes were sorted into three categories such as soils, noncombustibles, and combustibles was selected as the best method. Soils and noncombustibles could be recycled in the sites and combustibles could be compacted and be relandfilled in a smaller area.
Estimation of Design Population and Design Wastewater Flow Rate for the BTO Project of Wastewater Treatment Facilities
Son, Young-Gyu ; Lee, So-Young ; Kim, Lee-Hyung ; Khim, Jee-Hyeong ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 1, 2008, Pages 145~151
A novel method was suggested for the estimation of design population and design wastewater flow rate in fishing and agrarian village. Even though the population was decreasing continuously in this area, the design population was considered as constant with the passage of the time in conventional methods. And although the portion of groundwater uses was pretty high, the design wastewater flow rate was determined by the supply amount of tap water. Consequently, the design population and the design wastewater flow rate were overestimated. To prevent these overestimates, the design population was predicted to decrease gradually using the population trends from Korea National Statistical Office, and the design wastewater flow rate was determined using the way that the supply amount of tap water was applied in developed areas and the supply amount of groundwater was used in undeveloped areas.