• Title/Summary/Keyword: Fire damage

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Pohang City Fire Vulnerable Area Prediction and Fire Damage Rating Measurement by Administrative District (포항시 화재 취약지역 예측 및 이에 따른 행정구역별 화재 피해 등급 측정)

  • Lim, Jung-Hoon;Kim, Heon-Joo
    • The Journal of the Korea Contents Association
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    • v.21 no.4
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    • pp.166-176
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    • 2021
  • Due to urbanization and industrialization, the importance of large-scale fire prevention, management and measures is increasing day by day. However, the fire site arrival rate in Golden Time, which is a factor that can minimize large-scale fire damage, of Pohang, a large city with a population of over 500,000, is relatively low. So additional fire fighting power deployment and infrastructure investment are required. However, as budget and manpower are limited, it is necessary to selectively deploy fire fighting power and invest in infrastructure. Therefore, this study attempted to present a fire damage rating that can compare the level of fire damage, which is an index that can help selectively provide fire fighting services in Pohang and make related decisions. For the index, the OD cost matrix was used to predict fire vulnerable areas with a high probability of increasing the fire scale in the event of a fire. Also fire damage was measured by predicting the level of fire damage in the event of a fire according to population, building density, and access of fire trucks. It is expected that the fire damage rating will be able to help in various decisions related to fire fighting service deployment and services not only in Pohang city, but also in other regions.

Analyses on Related Factors with Fire Damage in Korea (한국에서의 화재 피해 관련요인 분석)

  • Chang, Eunmi;Kang, Byungki;Park, Kyeong
    • Journal of the Korean Geographical Society
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    • v.50 no.3
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    • pp.355-373
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    • 2015
  • In this study the factors of fire damage are analyzed through previous research reviews. Local environmental factors as well as those factors attributed to fire damage (number of fire events, number of injured, number of death, economic loss) were selected to compose mutual relationship model. In order to verify this relationship model, official statistics concerning fire damage were collected from 228 local governments and compared with results from previous research. As a result of this comparison four dependent variables and 22 independent variables that affect fire damage were analyzed. Independent variables are divided into human vulnerability factors, physical vulnerability factors, economic vulnerability factors, mitigating factors and local characteristics. To analyze a relationship between selected dependent variables and independent variables, we applied a semi-logarithm model and performed regression analysis. Among the 22 independent variables, the number of the weak to disaster, social welfare service workers, workers in manufacturing industry, and the number of workers in restaurants and bars per 10,000 people show the significant correlation with the number of fire incidence. The number of death from fire is significantly related to two variables which are the number of social welfare service workers per 10,000 and the ratio of commercial area. Damage cost is significantly dependent on the property taxes per 10,000 people. These factors were included in the research model as vulnerability factors (human, physical, economic) and mitigating factors and local characteristics, and the validity of research model was verified. The result could contribute to fire-fighting resource allocation in Korea or they can be utilized in establishing fire prevention policy, which will enhance the national level of fire safety.

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Forest Fire Damage Assessment Using UAV Images: A Case Study on Goseong-Sokcho Forest Fire in 2019

  • Yeom, Junho;Han, Youkyung;Kim, Taeheon;Kim, Yongmin
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.37 no.5
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    • pp.351-357
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    • 2019
  • UAV (Unmanned Aerial Vehicle) images can be exploited for rapid forest fire damage assessment by virtue of UAV systems' advantages. In 2019, catastrophic forest fire occurred in Goseong and Sokcho, Korea and burned 1,757 hectares of forests. We visited the town in Goseong where suffered the most severe damage and conducted UAV flights for forest fire damage assessment. In this study, economic and rapid damage assessment method for forest fire has been proposed using UAV systems equipped with only a RGB sensor. First, forest masking was performed using automatic elevation thresholding to extract forest area. Then ExG (Excess Green) vegetation index which can be calculated without near-infrared band was adopted to extract damaged forests. In addition, entropy filtering was applied to ExG for better differentiation between damaged and non-damaged forest. We could confirm that the proposed forest masking can screen out non-forest land covers such as bare soil, agriculture lands, and artificial objects. In addition, entropy filtering enhanced the ExG homogeneity difference between damaged and non-damaged forests. The automatically detected damaged forests of the proposed method showed high accuracy of 87%.

Fire Damage Assessment for Steel-Concrete Composite and PSC Bridge Superstructures Using Heat Flow Analysis (열유동 해석을 이용한 강합성 및 PSC 교량 상부구조의 화재손상평가)

  • Park, Yang Heum;Yun, Sung-Hwan;Jang, Il Young
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.41 no.2
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    • pp.93-100
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    • 2021
  • The objective of this research is to evaluate of fire damage for steel-concrete composite bridge superstructure and PSC bridge superstructure under highway bridge exposed to fire loading. To enhance the accuracy and efficiency of the numerical analysis, the proposed heat flow fire analysis method is implemented in ANSYS. The proposed heat flow analysis method is applied to fire damage analysis and performance evaluation for Buchen and Yangsan highway bridge. The result of analysis, temperature of concrete slab and lower flange of steel-concrete composite bridge superstructure are exceed the critical temperature. Also, temperature of slab, lower and upper flange, web of PSC bridge superstructure are exceed the critical temperature. However, the major component, tendon, did not exceed the critical temperature.

Post-Fire Damage and Structural Performance Assessment of a Steel-Concrete Composite Bridge Superstructure Using Fluid-Structure Interaction Fire Analysis (FSI 화재해석을 이용한 강합성 교량 상부구조의 화재 후 손상 및 구조성능 평가)

  • Yun, Sung-Hwan;Gil, Heungbae
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.41 no.6
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    • pp.627-635
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    • 2021
  • The fire damage and structural performance of a steel-concrete composite superstructure under a highway bridge exposed to fire loading was evaluated. To enhance the accuracy and efficiency of the numerical analysis, a proposed fluid-structure interaction fire analysis method was implemented in Ansys Fluent and Ansys Mechanical. The temperature distribution and performance evaluation of the steel-concrete composite superstructure according to the vertical distance from the fire source to the bottom flange were evaluated using the proposed analysis method. From the analysis, the temperature of the concrete slab and the bottom flange of the steel-concrete composite superstructure exceeded the critical temperature. Also, when the vertical distance from the fire source was 13 m or greater, the fire damage of the steel-concrete composite superstructure was found to within a safe limit.

An Experimental Study on the Engineering Properties of Deteriorated Concrete using Recycled Fine Aggregate by Fire Damage (재생잔골재를 활용한 화재피해를 입은 콘크리트의 공학적 특성에 관한 실험적 연구)

  • Kwon, Yung-Jin
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.1
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    • pp.190-196
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    • 2006
  • In the existed study, a fire outbreak in a reinforced concrete structure looses the organism by the different contraction and expansion of hardened cement pastes and aggregate, and causes cracks by thermal stress, leading to the deterioration of the durability. So accurate diagnosis of deterioration is needed based on mechanism of fire deterioration in general concrete structures. Fundamental information and data on the Properties of concrete exposed to high temperature are necessary for accurate diagnosis of deterioration. Therefore, This study is willing to propose fundamental data for quick and accurate diagnosis of deteriorated concrete structure by fire damage with making variable concrete test specimen, exposing high temperature environment, observing the explosive spalling and examining engineering property.

Analysis of Forest Fire Damage Areas Using Spectral Reflectance of the Vegetation (식생의 분광 반사특성을 이용한 산불 피해지 분석)

  • Choi, Seung-Pil;Kim, Dong-Hee;Ryutaro, Tateishi
    • Journal of Korean Society for Geospatial Information Science
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    • v.14 no.2 s.36
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    • pp.89-94
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    • 2006
  • Forest damage is a worldwide issue and specially, a forest fire involves damage to itself and causes secondary damage such as a flood etc. However, actually, clear analysis on forest fire damage can be hardly conducted due to difficulty in approaching a forest fire and quite a long period of time for analysis. To overcome such difficulty, recently, forest fire damage has been actively investigated with satellite image data, but it is also difficult to obtain satellite image data fitted to the time a forest fire occurred. In addition, it is burdensome to verify accuracy of the obtained image. Therefore, this study was attempted to look into the damaged districts from forest fires by reference to spectroradiometric characteristics of the obtained vegetation with a spectroradiometer as preliminary work to use satellite image data. To begin with, the researcher analyzed the field survey data each measured 3 months and 6 months after occurrence of a forest fire by judging the extent of the damage through visual observation and using a spectroradiometer in order to investigate any potential errors arising out of one-time visual observation. Besides, in this study, groups showing possibilities that trees might be restored to life and wither to death could be classified on the sampling points where forest fire damage is minor.

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Characteristics of Internal Hydrate Change in High Temperature Heated Concrete through Micro Analysis (미시 분석을 통한 고온 가열된 콘크리트의 내부 수화물 변화 특성)

  • Ji, Woo-Ram;Shin, Ki-Don;Cho, Hyeon-Seo;Lee, Gun-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.132-133
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    • 2018
  • The In this study, the change of composition of the hydrates according to the recovery age of concrete in the case of fire damage was confirmed through microscopic analysis. In 28 days of age, the production of ettringite was higher than that of day 1, and the calcium hydroxide was increased in the 91 day. It has been recovered through the generation of major hydrates which affect the strength.

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An Experimental Study on the Various Factors affect the Explosive Spalling of High Performance Concrete (고성능 콘크리트의 폭열에 미치는 각종 요인에 관한 실험적 연구)

  • Na, Chul-Sung;Shin, Kwan-Soo;Lee, Eui-Bae;Kwon, Young-Jin;Kim, Gyu-Yong;Kim, Moo-Han
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2006.04a
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    • pp.172-175
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    • 2006
  • Recently, fire resistance of high performance concrete for explosive spatting was issued as high performance concrete was vulnerable to the explosive spatting in initial fire. Therefore, This study is willing to propose fundamental data for quick and accurate diagnosis of deteriorated concrete structure by fire damage with making variable concrete test specimen, exposing high temperature environment, observing the explosive spatting and examining engineering property.

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