• Title, Summary, Keyword: full scale fire test

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A practical approach for fire safety design of fire-resistant steel members

  • Li, Guo-Qiang;Ding, Jun;Sakumoto, Y.
    • Steel and Composite Structures
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    • v.5 no.1
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    • pp.71-86
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    • 2005
  • Based on the test data of Nippon Steel Corporation, the formulas for calculating mechanical properties of fire-resistant (FR) steel at elevated temperatures have been established. A practical approach for fire safety design of FR steel members, including axially compressed members, flexural members and eccentrically compressed members, is developed in this paper. Compared with the full-scale specimen experiments and FEM numerical analysis, this practical approach for fire safety design of FR steel members is demonstrated to be effective and precise.

Evaluation on Fire Spread Speed of Standard Rack in Korea for Performance based Fire Extinguishing System (성능위주 소화설비 적용을 위한 표준랙크의 화재확산속도 평가)

  • Cho, Gyu-Hwan;Yeo, In-Hwan
    • Fire Science and Engineering
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    • v.30 no.6
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    • pp.84-91
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    • 2016
  • In case of fire, vertically and intensively loaded rack warehouses are faced with a severe status due to the rapid increase in fires. In this regard, there have been trials to prevent fires from spreading by applying fire extinguishing systems, such as ESFR and In-Rack Sprinklers, vertical and horizontal barriers, etc.; however, it is difficult to calculate and design proper fire extinguishing systems caused by various composition conditions, such as the size and loading density of the rack, types of loading commodities, etc. Therefore, in this study, a standard rack was manufactured, incorporating a rack warehouse in Korea by site investigations, surveys, etc. In addition, a full scale fire test was executed to check the fire characteristics depending on the conditions of the ignition points. As a result, the extracted fire spread speed is expected to be utilized as a reference for performance comparisons of the fire extinguishing systems to be developed and applied in the future.

Application of Horizontal Barrier on a Rack to Reduce Fire Spread (화재확산 저감을 위한 랙크 내 수평차단막 적용에 관한 연구)

  • Yeo, In-Hwan;Cho, Gyu-Hwan
    • Fire Science and Engineering
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    • v.31 no.4
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    • pp.71-79
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    • 2017
  • A rack warehouse with a vertically loading type and high loading density has severe risks and damage during its fire. In this regard, US and Japan strive to minimize the fire spread by applying in-rack sprinkler, horizontal barriers, etc. corresponding to their own rack warehouse but there is no study and policy in Korea. Therefore, a model scale fire test was carried out targeting the standard rack incorporating the national rack warehouse in order to check fire characteristics in ignition points and installation distances of horizontal barriers in this study. As a result of the test, vertical fire spread of about 30% was inhibited by narrowing its installation distance from 2-layer to 1-layer in an ignition condition of the flue space. In addition, as a result of the measurement of the temperature in the upper and lower parts of the horizontal barrier, the temperature distribution showed about 2~4 higher in a condition with an installation of the barrier than that in the condition without the barrier. Consequently, it is likely that the horizontal barrier will help the initial operation of in-rack sprinkler.

Hot- Fire Injector Test for Determination of Combustion Stability Boundaries Using Model Chamber

  • Sohn Chae Hoon;Seol Woo-Seok;Shibanov Alexander A.;Pikalov Valery P.
    • Journal of Mechanical Science and Technology
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    • v.19 no.9
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    • pp.1821-1832
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    • 2005
  • This study realizes the conceptual method to predict combustion instability in actual full-scale combustion chamber of rocket engines by experimental tests with model (sub-scale) chamber. The model chamber was designed based on the methodologies proposed in the previous work regarding geometrical dimensions and operating conditions, and hot-fire test procedures were followed to obtain stability boundaries. From the experimental tests, two instability regions are presented by the parameters of combustion-chamber pressure and mixture (oxidizer/fuel) ratio, which are customary for combustor designers. It is found that instability characteristics in the chamber with the adopted jet injectors can be explained by the correlation between the characteristic burning or mixing time and the characteristic acoustic time: In each instability region, dynamic behaviors of flames are investigated to verify the hydrodynamically-derived characteristic lengths of the jet injectors. Large-amplitude pressure oscillation observed in upper instability region is found to be generated by lifted-off flames.

Experimental Study on the Measurement of Fire Behavior and Heat Release Rate in Building Compartment Space - Focus on Full Scale Fire Test of the Bed Mattress - (건축물 구획공간에 따른 화재성상 및 열방출율 측정에 관한 실험적 연구 - 실물규모 침대 매트리스 화재시험 중심으로 -)

  • Seo, Bo-Youl;Jang, Woo-Bin;Park, Kye-Won;Hong, Won-Hwa
    • Fire Science and Engineering
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    • v.32 no.6
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    • pp.28-33
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    • 2018
  • To measure the full scale fire test and heat release rate of bed mattresses according to the building compartment space, a fire test was performed using the Standard test method to determine the heat release rate of mattresses and mattress sets (KS F ISO 12949: 2011). Both test locations showed similar fire growth until approximately 3 minutes after burner ignition. After 3 minutes, the heat release rate in the test room was higher than the open calorimeter. For bed mattresses (SS), the maximum heat release rate in the open calorimeter was 735 kW and the maximum heat release rate in the test room was 992 kW. For bed mattresses (Q), the heat release rate in the test room increased more rapidly than the open calorimeter. The maximum heat release rate in the open calorimeter was 1,087 kW (346 s) and the maximum heat release rate in the test room was 2,127 kW (287 s). The difference between the maximum heat release rate and the measurement time according to the test location was confirmed.

Fire resistance of high strength fiber reinforced concrete filled box columns

  • Tang, Chao-Wei
    • Steel and Composite Structures
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    • v.23 no.5
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    • pp.611-621
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    • 2017
  • This paper presents an investigation on the fire resistance of high strength fiber reinforced concrete filled box columns (CFBCs) under combined temperature and loading. Two groups of full-size specimens were fabricated. The control group was a steel box filled with high-strength concrete (HSC), while the experimental group consisted of a steel box filled with high strength fiber concrete (HFC) and two steel boxes filled with fiber reinforced concrete. Prior to fire test, a constant compressive load (i.e., load level for fire design) was applied to the column specimens. Thermal load was then applied on the column specimens in form of ISO 834 standard fire curve in a large-scale laboratory furnace until the set experiment termination condition was reached. The test results show that filling fiber concrete can improve the fire resistance of CFBC. Moreover, the configuration of longitudinal reinforcements and transverse stirrups can significantly improve the fire resistance of CFBCs.

Experimental investigation of the behaviour of a steel sub-frame under a natural fire

  • Santiago, Aldina;Simoes da Silva, Luis;Vaz, Gilberto;Vila Real, Paulo;Lopes, Antonio Gameiro
    • Steel and Composite Structures
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    • v.8 no.3
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    • pp.243-264
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    • 2008
  • This paper details a testing facility ("NATURAL FIRE FACILITY") that allows closely-controlled experimental testing on full-scale sub-frames while reproducing the spatially transient temperature conditions measured in real fires. Using this test facility, an experimental investigation of six steel sub-frames under a natural fire was carried out at the Department of Civil Engineering of the University of Coimbra. The main objective of these tests was to provide insight into the influence of these connection types on the behaviour of steel sub-structures under fire. The experimental layout is defined by two thermally insulated HEA300 columns and an unprotected IPE300 beam with 5.7 m span, supporting a composite concrete slab. Beam-to-column connections are representative of the most common joint type used on buildings: welded joints and extended, flush and partial depth plate. Finally, the available results are presented and discussed: evolution of the steel temperature; development of displacements and local deformations and failure modes on the joints zone.

Development for the Water Mist Package Having a Low Pressure Nozzles on Wooden Cultural Properties and Temples (중저압 노즐을 이용한 사찰 및 목조 문화재용 미분무 패키지 소화설비 개발)

  • Kim, Tae-Hwan;Myeong, Sang-Yeong
    • Fire Science and Engineering
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    • v.24 no.4
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    • pp.62-68
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    • 2010
  • The present study purposed to develop the water mist package system for the cultural properties fire prevention and fire suppression system through analyzing fire protection system and cultural property's characteristic, and to suggest directions for the development of cultural property fire prevention system in the future. Maximum safety with minimum damage has issued a main objective in fire protection of the cultural property in Korea. Two types of the water mist nozzles having a low pressure had been developed by KEI. The one is for inside using in wooden cultural properties, the flow rate is 30~35 l/min and the discharging pressure is 13~14 bar. The other one is for out-side of wooden properties, the flow rate is 25~30 l/min and the discharging pressure is 14~15 bar. To evaluate the nozzles performance test, we made the fire scenario and full-scale model of wooden cultural properties for fire test. The size of full-scale model was 4.9 m length, 4 m wide, 6.6 m height, all was made by wooden. This real fire test results showed that the low pressure water mist nozzles having a $200{\mu}m$ dour size were very effectively fire extinguishing and suppression on wooden cultural properties fire. Even though the oil fuel fire was not extinguished, the fire suppression effects for the during mobilization of fire brigade was enough.

Experimental Study to Estimate the Required Flow of Fire Extinguishing System for Flame Spread Prevention on Composite Panel (복합패널 화재확산 방지를 위한 소화시스템의 소요유량 산정을 위한 실험적 연구)

  • Park, Byoung-Jik;Shin, Hyun-Jun;Yoo, Yong-Ho;Park, Jin-Ouk;Kim, Hwi-Seong;Kim, Yang-Kyun
    • Fire Science and Engineering
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    • v.31 no.6
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    • pp.33-39
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    • 2017
  • Composite panel refers to the particular plywood produced in a way of stacking the different kinds of material in sandwich form and adhering them using adhesives and is widely used as building material for its constructability and cost efficiency. But as the surface is finished with steel plate, fire extinguishing agent cannot reach to the core material because of such steel plate on surface which causes the difficulties in suppressing the fire as well as in fire-fighting activities due to collapse. This study, to deal with such problem, is intended to set the fire pipe in core material to prevent the fire from spreading and in a bid to achieve this using minimized fire water, water supply test device was fabricated to estimate the required water flow of fire extinguisher and consequently, optimal water flow (0.5 L/min) was determined through a full-scale fire test.

The Real Scale Fire Tests for Vertical Fire Spread Study of External Finishing Material (외벽 마감재료의 수직화재 확산 연구를 위한 실물화재 실험)

  • Kweon, Oh-Sang;Yoo, Yong-Ho;Kim, Heung-Youl;Kim, Jung-Hyun;Min, Se-Hong
    • Fire Science and Engineering
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    • v.26 no.6
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    • pp.85-91
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    • 2012
  • To reduce human life and property damage at the fire in a building, it is most critical to control flame spread in the early stage. Fire spread prevention measure generally includes fire resistance performance securing of structure member in the arson zone and use limitation based on combustion performance of finishing material. The latter is most fundamental fire safety design to determine flame spread, but domestic combustion test determines combustion performance by specimen sized fire test method. Thus, there are many restrictions in the determination of combustion performance by composite material such as sandwich panel. Especially, outer finishing material uses a variety of composite material such as dry bit, aluminum composite panel, and metal panel compared to inner finishing material. Therefore, this study would determine vertical fire spread features by a full scaled fire experiment through the test method of ISO 13785-2, an international test standard.