• Title/Summary/Keyword: post-fire

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Condition assessment of fire affected reinforced concrete shear wall building - A case study

  • Mistri, Abhijit;Pa, Robin Davis;Sarkar, Pradip
    • Advances in concrete construction
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    • v.4 no.2
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    • pp.89-105
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    • 2016
  • The post - fire investigation is conducted on a fire-affected reinforced concrete shear wall building to ascertain the level of its strength degradation due to the fire incident. Fire incident took place in a three-storey building made of reinforced concrete shear wall and roof with operating floors made of steel beams and chequered plates. The usage of the building is to handle explosives. Elevated temperature during the fire is estimated to be 350C350C based on visual inspection. Destructive (core extraction) and non-destructive (rebound hammer and ultrasonic pulse velocity) tests are conducted to evaluate the concrete strength. X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) are used for analyzing micro structural changes of the concrete due to fire. Tests are conducted for concrete walls and roof slab on both burnt and unburnt locations. The analysis of test results reveals no significant degradation of the building after the fire which signifies that the structure can be used with full expectancy of performance for the remaining service life. This document can be used as a reference for future forensic investigations of similar fire affected concrete structures.

Mapping of Post-Wildfire Burned Area Using KOMPSAT-3A and Sentinel-2 Imagery: The Case of Sokcho Wildfire, Korea

  • Nur, Arip Syaripudin;Park, Sungjae;Lee, Kwang-Jae;Moon, Jiyoon;Lee, Chang-Wook
    • Korean Journal of Remote Sensing
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    • v.36 no.6_2
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    • pp.1551-1565
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    • 2020
  • On April 4, 2019, a forest fire started in Goseong County and lasted for three days, burning the neighboring areas of Sokcho. The strong winds moved the blaze from one region to another region and declared the worst wildfire in South Korea in years. More than 1,880 facilities, including 400 homes, were burnt down. The fire burned a total area of 529 hectares (1,307 acres), which involved 13,000 rescuers and 16,500 military troops to control the fire occurrence. Thousands of people were evacuated, and two people are dead. This study generated post-wildfire maps to provide necessary data for evacuation and mitigation planning to respond to this destructive wildfire, also prevent further damage and restore the area affected by the wildfire. This study used KOMPSAT-3A and Sentinel-2 imagery to map the post-wildfire condition. The SVM showed higher accuracy (overall accuracy 95.29%) compared with ANN (overall accuracy of 94.61%) for the KOMPSAT-3A. Moreover, for Sentinel-2, the SVM attained a higher accuracy (overall accuracy of 91.52%) than the ANN algorithm (overall accuracy 90.11%). In total, four post-wildfire burned area maps were generated; these results can be used to assess the area affected by the Sokcho wildfire and wildfire mitigation planning in the future.

Development Plan for the Consequence Management in Response to Large-Scale Wildfire Disasters Using Air Force Transport Aircraft (C-130) (공군 수송기(C-130)를 활용한 대형산불 재난 대응 시 사후관리(CM) 발전방안)

  • Sangduk Kim;Minki Kim
    • Journal of the Society of Disaster Information
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    • v.20 no.1
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    • pp.232-243
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    • 2024
  • Purpose: Recently, large-scale forest fires caused by climate change, natural disasters, and human factors have been increasing every year in the East Coast and Taebaek Mountains region. Although forest fire extinguishing using helicopters is currently increasing, the need to introduce air force transport aircraft has continued to be raised due to the importance of early fire extinguishment to respond to large forest fires and the difficulty of extinguishing forest fires between sheep. This study seeks to present a plan for developing a post-fire management system for several aspects - achieving operational objectives, overcoming the operating environment, selecting a staging area, and efficient operation measures - to efficiently perform forest fire extinguishing missions using Air Force transport aircraft. Method: Based on literature research on forest fire extinguishing, forest fire extinguishing experiments using fixed-wing aircraft, and the operation status and operation method of forest fire extinguishing helicopters, the pros and cons of helicopter operation and the effects of large forest fire extinguishing using a large transport aircraft (C-130) Analyze the effectiveness of operation through analysis. Results: When extinguishing a large forest fire, an effective CM (Consequence Management) application plan was derived, including effective operation, control, command system, dispatch request, and forest fire extinguishment when integrating helicopter and fixed-wing aircraft (C-130). Conclusion: The application of the concept of CM (Consequence Management) is partially applied to some areas of chemical, biological, and radiological (CBRNE) protection in Korea, but efficient operation, control, and command systems are established when integrated operation of helicopters and large aircraft (C-130) in forest fire extinguishment. the concept of CM (Consequence Management), which is operated in advanced countries, was applied for safety management, dispatch requests, and forest fire extinguishing, thereby contributing to the establishment of a more advanced disaster and post-disaster management system.

CROSS FLOW EFFECTS ON THE FLAME HEIGHT OF AN INTERMEDIATE SCALE DIFFUSION FLAME

  • Kolb, Gilles;Torero, Jose L.;Most, Jean-Michel;Joulain, Pierre
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 1997.11a
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    • pp.169-177
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    • 1997
  • An experimental study has been conducted at an intermediate scale to study the effect of a cross flow on a purely buoyant fire. Video taping of the flame and post processing of the images by means of a novel technique provide a contour of a mean flame for all cases studied. This flame contour allows the determination of a mean flame length and a mean flame height. The mean flame length and height are recorded as functions of the forced flow velocity. Three dimensional flow patterns are formed in the flame trailing edge affecting both the mean flame length and height. The three dimensional patterns are studied systematically as functions of the cross flow velocity to quantify the effect of confinement on the flame geometry.

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Problem and Improvement Plan of Existing Fire Examination and Investigation System (현행 화재조사 및 수사체계의 문제점과 개선방안)

  • Kim, Hyung-Doo
    • Fire Science and Engineering
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    • v.21 no.1 s.65
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    • pp.37-50
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    • 2007
  • A primary task of fire department is maintaining public safety, system maintenance and welfare improvement by protecting life, body and property of a people through prevent and extinguish of the fire in emergency. Rescue part of those affairs has supported by the people but affairs related to the fire examination and investigation could not get it. Although fire examination is a very important part of fire department administration, it has been understood indifferently due to lack of awareness and concern. There are no scientific fire examination because of lacking education study and the whole responsibility capacity about it. There are many things have to be improved at fire examination and investigation system in Korea. Especially, establishment of the whole responsibility post is urgent through assuring professionals to improve accuracy of fire examination and investigation. Equipment which can do scientific fire examination and investigation have to be fully furnished. Efficiency of fire examination and investigation has to be increased through improving law related to fire examination and investigation, giving rescuers investigation right. Through this, it systematically have to be good for fire prevent.

Analysis of the Relationship between Landform and Forest Fire Severity (지형과 산불피해도와의 관계 분석)

  • Lee, Byung-Doo;Won, Myoung-Soo;Jang, Kwang-Min;Lee, Myung-Bo
    • Journal of the Korean Association of Geographic Information Studies
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    • v.11 no.1
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    • pp.58-67
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    • 2008
  • Topography factors, as homeostasis variables at forest fire, affect the formation of fuel load patterns, atmospheric phenomena and forest fire behavior. Examination of the correlation between landforms and fire severity is important to decision making for fire hazard analysis and fighting strategies. In this study, fire severity was analyzed using Normalized Burn Ratio(NBR) derived from pre- and post-fire Landsat TM/+ETM images and landform were classified based on Topographic Position Index(TPI) in Samcheok(2000), Cheongyang(2002), and Yangyang(2005) forest fire regions. F-tests and Duncan's multi-range test between landform and fire severity showed that fire severities of headwater, high ridges, and upper slopes is higher than ones of local ridges, midslope ridges, and plains. Fire severity were more sensitive in coniferous forest than broadleaf forests.

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Effects of Forest Therapy Program on Stress levels and Mood State in Fire Fighters (산림치유프로그램이 소방공무원의 외상 후 스트레스 및 기분상태 변화에 미치는 효과)

  • Park, Choong-Hee;Kang, Jaewoo;An, Miyoung;Park, SuJin
    • Fire Science and Engineering
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    • v.33 no.6
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    • pp.132-141
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    • 2019
  • This study was conducted to investigate the effects of a forest therapy program on post-traumatic stress disorder (PTSD) and mood states of fire fighters. A total of 293 participants completed two psychological questionnaires before and after the program was conducted: the Post Traumatic Stress Disorder Checklist (PCL) and the Profile of Mood States (POMS). Data were analyzed with paired t-test and ANCOVA using SPSS 24.0. The PTSD results showed a significant decrease from 11.38 ± 12.58 points before the program to 6.91 ± 10.50 points after the program. Results of the POMS questionnaire revealed an increase in positive factors and a decrease in negative factors, with a significant overall decrease in POMS results from 8.58 ± 18.47 points before the program to -0.63 ± 15.83 points after the program. As a result of analyzing the differences in stress reduction effects according to the amount of sleep participants had, PTSD showed improvement at 6-8 hours of sleep. These results are expected to be utilized as a basis for stress management and relief in fire fighters.

Flexural Performance of RC Beams Strengthened with NSM-GFRP Exposed to High Temperature (GFRP 표면매립공법으로 보강된 RC보의 고온노출 후 휨 성능)

  • Kim, Hee-Seung;Lee, Hye-Hak;Choi, Kyoung-Kyu
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.4
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    • pp.35-42
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    • 2018
  • This study evaluated the fire resisting capacity and post-fire serviceability of the concrete beams retrofitted by near surface mounted method(NSM) using GFRP plates. Main parameters in the test are grout materials and fire exposure. For the test, two types of grout materials between concrete substrate and GFRP plate were used; flame resisting epoxy and filling mortar. Four RC beam specimens were made and two of them were exposed to fire according to real scale fire curve proposed KS F 2257. After the fire exposure test, flexural test were performed to investigate the flexural performance of concrete beams including strength and deformation. From the test results, it was found that the beam retrofitted by NSM-GFRP presented higher flexural strength than that of the beam without retrofit, which indicates NSM-GFRP retrofit technologies is effective to maintain flexural strength even after fire exposure. In addition, the specimens grouted by epoxy showed good performance in strength but bad performance in ductility.

An Investigation of Fire Human Reliability Analysis (HRA) Factors for Quantification of Post-fire Operator Manual Actions (OMA) (화재 후 운전원수동조치(OMA) 정량화를 위한 화재 인간신뢰도분석 (HRA) 요소에 대한 고찰)

  • Sun Yeong Choi;Dae Il Kang;Yong Hun Jung
    • Journal of the Korean Society of Safety
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    • v.38 no.6
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    • pp.72-78
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    • 2023
  • The purpose of this paper is to derive a quantified approach for Operator Manual Actions (OMAs) based on the existing fire Human Reliability Analysis (HRA) methodology developed by the Korea Atomic Energy Research Institute (KAERI). The existing fire HRA method was reviewed, and supplementary considerations for OMA quantification were established through a comparative analysis with NUREG-1852 criteria and the review of the existing literature. The OMA quantification approach involves a timeline that considers the occurrence of Multiple Spurious Operations (MSOs) during a Main Control Room Abandonment (MCRA) determination and movement towards the Remote Shutdown Panel (RSP) in the event of a Main Control Room (MCR) fire. The derived failure probability of an OMA from the approach proposed in this paper is expected to enhance the understanding of its reliability. Therefore, it allows moving beyond the deterministic classification of "reliable" or "unreliable" in NUREG-1852. Also, in the event of a nuclear power plant fire where multiple OMAs are required within a critical time range, it is anticipated that the OMA failure probability could serve as a criterion for prioritizing OMAs and determining their order of importance.

A Clinical Study of Art Therapy for Children Who Witnessed a Tragic Accident (충격적 사고를 목격한 아동에 대한 미술치료 사례)

  • Kim, Sun-Hyun;Chang, Young-Yoon;Kim, Boong-Nyeun;Kwon, Bok-Ja;Jang, Eun-Hee
    • Journal of the Korean Society of School Health
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    • v.23 no.2
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    • pp.143-150
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    • 2010
  • Purpose: This study aims to examine what can be seen in children's paintings, their common characteristics, and what role art therapy plays in diagnosing the post-traumatic stress disorder in children who experienced trauma, through an art therapy program among elementary school students that witnessed the death of parents from a fire drill accident. Methods: A program of three times of art therapy was progressed among 34 children who witnessed a fire accident. Revised Children's Manifest Anxiety Scale (RCMAS) was used for comparative analysis of art therapy results. Results and Conclusion: First, children who had the possibility to develop post-traumatic stress disorder were found through art therapy. Second, an opportunity to express themselves were given to children who refused psychological tests or treatment through art therapy.