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Synergistic effects of typical clean gaseous fire-extinguishing agents 典型清洁气体灭火剂的协同效应
IF 3.4 3区 工程技术 Q1 Engineering Pub Date : 2024-06-18 DOI: 10.1016/j.firesaf.2024.104206
Qichang Dong, Jiacheng Qi, Song Lu, Long Shi

Gaseous fire-extinguishing agents have received widespread attention due to their high efficiency, excellent extinguishing performance, and limited damage to protected objects. Previous attempts have mainly focused on the fire-extinguishing effect of single gaseous fire-extinguishing agents, where the synergistic use of gaseous extinguishing agents with different extinguishing agents has been less summarized. This study critically reviewed typical gaseous fire-extinguishing agents and their synergistic extinguishing effects, including Novec1230, hydrofluorocarbons (HFCs), inert or inactive gases, etc. It was known that the synergistic use of different extinguishing agents could compensate for the shortcomings of a single agent in physical or chemical fire extinguishing, reduce the amount of extinguishing agent used, the production of toxic substances, and improve the efficiency of the mixed system of fire extinguishing. Gas-gas synergy (e.g., Novec1230-C6F15N or Novec1230-CO2) can inhibit the flammability of some gaseous extinguishing agents at low concentrations and enhance the flame retardant and explosion suppressant effects of the mixed systems. Gas-liquid synergy (e.g., Novec1230-water mist or HFC-227ea-water mist) considers both the roles of rapid fire suppression and cooling of the protection object. To a certain extent, gas-solid synergy (e.g., HFC-227ea-SiO2 dry powder or N2-ABC dry powder) makes up for the poor coverage of dry powder fire extinguishing agents to achieve rapid and low-pollution fire extinguishing goals. This review offers guidance and suggestions for the efficient and clean use of extinguishing agents and the potential future direction.

气体灭火剂因其灭火效率高、灭火性能优越、对被保护对象的损害有限而受到广泛关注。以往的尝试主要集中在单一气体灭火剂的灭火效果上,对气体灭火剂与不同灭火剂的协同使用总结较少。本研究对典型的气体灭火剂及其协同灭火效果进行了严格审查,包括 Novec1230、氢氟碳化合物(HFCs)、惰性或非活性气体等。众所周知,不同灭火剂的协同使用可以弥补单一灭火剂在物理或化学灭火中的不足,减少灭火剂的使用量和有毒物质的产生,提高混合系统的灭火效率。气-气协同(如 Novec1230-C6F15N 或 Novec1230-CO2)可抑制某些气态灭火剂在低浓度下的可燃性,增强混合体系的阻燃和抑爆效果。气液协同(如 Novec1230-水雾或 HFC-227ea-水雾)兼顾了快速灭火和冷却保护对象的作用。气固协同(如 HFC-227ea-SiO2 干粉或 N2-ABC 干粉)在一定程度上弥补了干粉灭火剂覆盖面小的缺陷,达到快速、低污染灭火的目的。本综述为高效、清洁地使用灭火剂以及潜在的未来方向提供了指导和建议。
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引用次数: 0
Analytical formulations with experimental validation for determining the incident heat flux from firefronts 通过实验验证确定火面入射热通量的分析公式
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-12 DOI: 10.1016/j.firesaf.2024.104205
MohammadReza Modarres , Miguel Almeida , Gilberto Vaz , Domingos X. Viegas

Any target exposed to a heat source receives a certain amount of heat flux, depending on the distance, view factor, characteristics of the source, and environmental properties. Incident heat flux is mainly characterized by firefront properties, e.g., flame dimensions, and its thermal attributes by fuel properties, topography, and meteorological factors. Predicting the incident heat flux from the firefronts is crucial for fire risk management and analytical and numerical fire modelling. Based on this specification, safe zones can be defined for elements such as unprotected individuals, firefighters, and buildings. Since the contribution of radiation and convection varies with the fire evolution, it is essential to specify them as a function of distance and slope. This study elaborates determination of radiation and convection for firefronts. Sets of laboratory-scale experiments were conducted using fuel beds of straw with a load of 1.5 kg/m2 on the slopes of 0°, 20°, and 40° measuring the incident radiative and total heat fluxes. The proposed methodology was validated using available approaches and correlations between the flame length and the acceptable safety distance (ASD) were established. Unlike the existing models, a nonlinear correlation between convection and radiation during the firefront evolution is proposed.

任何暴露在热源下的目标都会接收到一定量的热通量,这取决于距离、视角系数、热源特性和环境属性。入射热通量主要由火面特性(如火焰尺寸)以及燃料特性、地形和气象因素决定的热属性来表征。预测来自火面的入射热通量对于火灾风险管理以及火灾分析和数值建模至关重要。根据这一规范,可以为无保护人员、消防员和建筑物等要素定义安全区域。由于辐射和对流的作用随火灾演变而变化,因此必须将它们指定为距离和坡度的函数。本研究详细阐述了火场辐射和对流的确定方法。在 0°、20° 和 40° 坡度上使用负载为 1.5 kg/m2 的稻草燃料床进行了多组实验室规模的实验,测量入射辐射和总热流量。利用现有方法对所提出的方法进行了验证,并建立了火焰长度与可接受安全距离(ASD)之间的相关性。与现有模型不同的是,提出了火线演变过程中对流与辐射之间的非线性关联。
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引用次数: 0
Systematically varying zwitterionic-siloxane surfactant structure to affect interfacial properties, foam stability, and fire suppression 系统改变齐聚物硅氧烷表面活性剂结构以影响界面特性、泡沫稳定性和灭火效果
IF 3.4 3区 工程技术 Q1 Engineering Pub Date : 2024-06-12 DOI: 10.1016/j.firesaf.2024.104199
Ramagopal Ananth , Katherine M. Hinnant , Matthew C. Davis , Arthur W. Snow , Caleb M. Bunton , Stanley Karwoski (Jr) , John P. Farley

Zwitterionic siloxane-sulfobetaine (siloxaneSB) surfactants are developed to replace per- and poly-fluoroalkyl substances (PFAS) used currently in aqueous firefighting foams because PFAS pose significant threats to environment and human health. SiloxaneSB surfactant's head and tail structures are varied gradually, one step at a time, to vary hydrophilicity of the head and hydrophobicity, and oleophobicity of the tail. Identical methods and conditions are used across all the surfactants to correlate surfactant structure to interfacial and foam properties, and fire suppression. The results suggest that the amphiphilic balance of the siloxane surfactant have dramatic effects on CMC, interfacial tension, foam expansion ratio, foam degradation, heptane vapor permeation through a foam layer, and fire suppression but little effect on bubble size, coarsening, and liquid drainage. They show synergism between siloxaneSB and alkylpolyglycoside in gasoline fire suppression while trisiloxane-polyoxyethylene exhibited synergism in heptane fire suppression. A 28 ft2 gasoline pool-fire suppression results were consistent with the bench-scale findings for tetrasiloxaneSB and trisiloxane-polyoxyethylene formulations. Small changes to surfactant molecular structure can dramatically improve its amphiphilic balance, synergisms, fuel-foam interactions resulting in improved effectiveness of fluorine-free foams but depend very much on the fuel, unlike the fluorocarbon surfactants.

硅氧烷-磺基甜菜碱(siloxaneSB)表面活性剂是为了取代目前在水性消防泡沫中使用的全氟烷基和多氟烷基物质(PFAS)而开发的,因为全氟烷基和多氟烷基物质(PFAS)对环境和人类健康构成重大威胁。硅氧烷-SB 表面活性剂的头部和尾部结构是一步一步逐渐改变的,以改变头部的亲水性、疏水性和尾部的疏油性。所有表面活性剂均采用相同的方法和条件,以将表面活性剂结构与界面和泡沫特性以及灭火性能联系起来。结果表明,硅氧烷表面活性剂的两亲平衡对 CMC、界面张力、泡沫膨胀率、泡沫降解、庚烷蒸汽通过泡沫层的渗透和灭火有显著影响,但对气泡大小、粗化和排液影响很小。研究表明,硅氧烷-SB 和烷基聚糖苷在汽油灭火方面具有协同作用,而三硅氧烷-聚氧乙烯在庚烷灭火方面具有协同作用。28 平方英尺汽油池的灭火结果与四硅氧烷-SB 和三硅氧烷-聚氧乙烯配方的台架试验结果一致。表面活性剂分子结构的微小变化可以显著改善其两亲平衡、协同作用以及燃料与泡沫之间的相互作用,从而提高无氟泡沫的功效,但与碳氟化合物表面活性剂不同的是,这在很大程度上取决于燃料。
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引用次数: 0
Effect of structural characteristics on charring shrinkage and cracking of densified wood under radiative heatings 结构特征对辐射加热条件下致密木材炭化收缩和开裂的影响
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-11 DOI: 10.1016/j.firesaf.2024.104204
Tianyang Chu , Chuangang Fan , Chunli Liu , Saiya Feng , Zhengyang Wang , K.M. Liew

Densified wood (DW) is a novel engineering material with excellent mechanical properties. It forms a thermally insulating and hardly-cracked char layer during pyrolysis and combustion. However, the scientific fundamentals regarding how wood structural characteristics (e.g. density) affect its charring behavior remain unknown, which is important for the fire safety of wood. In this work, the charring shrinkage and cracking of NW and DW with various densities (ρ) under heating exposures (Qr) are investigated and analyzed. Partial crack closure was observed due to the oxidation. As wood ρ increases or Qr decreases, the number of cracks (Nc) decreases and cracking time (tc) is delayed because both the surface temperature (Tsurf) and altered thermal stress concentrations on the wood surface are reduced. DW presents an earlier mass loss peak and lower peak value due to the delignification. DW presents high fluctuations in Tsurf due to the combing effect of thermal inertia and radial rebound. As wood ρ increases, char shrinkage depth at tc decreases and shrinkage gradient at tc increases first and then decreases. An empirical correlation is proposed and well-predicts the Nc based on ρ and Qr. It can be potentially implemented in the combustion model to improve prediction accuracy.

致密木材(DW)是一种新型工程材料,具有优异的机械性能。它在热解和燃烧过程中会形成隔热且几乎不开裂的炭化层。然而,有关木材结构特征(如密度)如何影响其炭化行为的科学基础仍然未知,而这对木材的防火安全非常重要。在这项工作中,研究和分析了不同密度 (ρ) 的 NW 和 DW 在加热暴露 (Qr) 下的炭化收缩和开裂情况。由于氧化作用,观察到部分裂缝闭合。随着木材 ρ 的增大或 Qr 的减小,裂纹数量(Nc)减少,开裂时间(tc)推迟,因为木材表面温度(Tsurf)和改变的热应力浓度都降低了。由于木质素的脱落,DW 的质量损失峰值较早,峰值较低。由于热惯性和径向反弹的组合效应,DW 的 Tsurf 波动较大。随着木材 ρ 的增大,tc 处的炭收缩深度减小,tc 处的收缩梯度先增大后减小。根据 ρ 和 Qr 提出了一种经验相关性,并能很好地预测 Nc。可以将其应用于燃烧模型,以提高预测精度。
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引用次数: 0
Comparative extinction of pine needle fires by gravity-fed release of inert cryogen or water 通过重力释放惰性冷冻剂或水对松针火的灭火效果进行比较
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-10 DOI: 10.1016/j.firesaf.2024.104203
Aobo Liu, Michael A. Delichatsios, Yiannis A. Levendis

Dead needle debris accumulates in pine forest floors and poses wildfire hazards. This manuscript reports on laboratory-scale research, where gravity-fed liquid nitrogen (LN2) jets were used to suppress and extinguish pine needle fires. Minimum quantities of LN2 needed for fire extinction were determined, and similar quantities of gravity-fed water jets or water sprays were also used to illustrate differences in the underlying extinction mechanisms. LN2 snuffed the fires instantaneously, as its massive flash-vaporization and volumetric expansion displaced the surrounding air and starved the fires for oxygen. Concomitant cooling of the flame zone and the fuel bed also occurred by the vaporizing cryogen. To the contrary, water suppressed the fire by wetting and cooling accessible fuel surfaces. However, fuel bed surfaces which were not wetted continued to pyrolyze and smolder, and eventually reignited. In these experiments, a portion of the volatile LN2 jet vaporized in transit, a portion vaporized while traversing the hot gases of the flame, a portion vaporized in the pine needle pile, and some reached the ground and was absorbed therein. Application of LN2 to fires in confined spaces was most effective for fire extinction. Application of the cryogen to hot spots facilitated flash vaporization for maximum volumetric expansion.

枯针碎屑积聚在松林地表,对野火造成危害。本手稿报告了实验室规模的研究,使用重力输送液氮(LN2)喷射器抑制和扑灭松针火灾。研究人员确定了灭火所需的最低液氮量,还使用了类似数量的重力喷射水柱或水喷雾,以说明基本灭火机制的差异。LN2 能瞬间熄灭大火,因为它的大量闪蒸和体积膨胀会排出周围的空气,使大火缺乏氧气。汽化的低温物质还同时冷却了火焰区和燃料层。相反,水通过润湿和冷却可接触到的燃料表面抑制了火势。然而,未被润湿的燃料层表面继续热解和燃烧,并最终复燃。在这些实验中,一部分挥发性 LN2 喷射在运输途中气化,一部分在穿越火焰的热气时气化,一部分在松针堆中气化,还有一部分到达地面并被吸收。在密闭空间中使用 LN2灭火最有效。将低温剂用于热点可促进瞬间汽化,从而实现最大的体积膨胀。
{"title":"Comparative extinction of pine needle fires by gravity-fed release of inert cryogen or water","authors":"Aobo Liu,&nbsp;Michael A. Delichatsios,&nbsp;Yiannis A. Levendis","doi":"10.1016/j.firesaf.2024.104203","DOIUrl":"https://doi.org/10.1016/j.firesaf.2024.104203","url":null,"abstract":"<div><p>Dead needle debris accumulates in pine forest floors and poses wildfire hazards. This manuscript reports on laboratory-scale research, where gravity-fed liquid nitrogen (LN<sub>2</sub>) jets were used to suppress and extinguish pine needle fires. Minimum quantities of LN<sub>2</sub> needed for fire extinction were determined, and similar quantities of gravity-fed water jets or water sprays were also used to illustrate differences in the underlying extinction mechanisms. LN<sub>2</sub> snuffed the fires instantaneously, as its massive flash-vaporization and volumetric expansion displaced the surrounding air and starved the fires for oxygen. Concomitant cooling of the flame zone and the fuel bed also occurred by the vaporizing cryogen. To the contrary, water suppressed the fire by wetting and cooling accessible fuel surfaces. However, fuel bed surfaces which were not wetted continued to pyrolyze and smolder, and eventually reignited. In these experiments, a portion of the volatile LN<sub>2</sub> jet vaporized in transit, a portion vaporized while traversing the hot gases of the flame, a portion vaporized in the pine needle pile, and some reached the ground and was absorbed therein. Application of LN<sub>2</sub> to fires in confined spaces was most effective for fire extinction. Application of the cryogen to hot spots facilitated flash vaporization for maximum volumetric expansion.</p></div>","PeriodicalId":50445,"journal":{"name":"Fire Safety Journal","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0379711224001164/pdfft?md5=0f2f4907be834437487907c500986053&pid=1-s2.0-S0379711224001164-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141323465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical design calculation of bolted lap joints at elevated temperatures 高温条件下螺栓搭接接头的数值设计计算
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-08 DOI: 10.1016/j.firesaf.2024.104202
Batuhan Der, František Wald

This paper presents experimental and numerical studies to investigate the mechanical behaviour of bolted lap joints at elevated temperatures. The load-deformation curves, failure modes, and resistance values of the specimens were obtained from experimental studies. A solid finite element model generated using ABAQUS software was validated and verified by the experimental results and analytical models to investigate the different failure modes and predict the fire resistance of bolted lap joints at elevated temperatures, respectively. Then, the component-based finite element model (CBFEM) was prepared to analyse the fire behaviour of bolted lap joints as an alternative to design specifications for structural fire engineers. The CBFEM was verified by the validated solid model and analytical models in terms of load-deformation curve, fire resistance, and failure modes. Parametric studies were performed to investigate the influence of several parameters on the fire response of bolted lap joints. The study shows that the CBFEM may be used to design bolted lap joints at elevated temperatures and the 5 % limit strain for plates proposed in EN 1993-1-5 can be applicable for predicting the fire resistance of steel connections.

本文通过实验和数值研究来探讨螺栓搭接接头在高温下的机械性能。实验研究获得了试样的载荷-变形曲线、失效模式和阻力值。利用 ABAQUS 软件生成的实体有限元模型通过实验结果和分析模型进行了验证,分别研究了螺栓搭接接头在高温下的不同失效模式并预测了其耐火性。然后,编制了基于构件的有限元模型(CBFEM)来分析螺栓搭接接头的防火行为,作为结构防火工程师设计规范的替代方案。CBFEM 在载荷-变形曲线、耐火性和失效模式方面得到了经过验证的实体模型和分析模型的验证。还进行了参数研究,以探讨多个参数对螺栓搭接接头火灾响应的影响。研究表明,CBFEM 可用于设计高温下的螺栓搭接接头,EN 1993-1-5 中提出的板材 5 % 极限应变可用于预测钢连接的耐火性。
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引用次数: 0
Impact of supply and exhaust ventilation system on gas concentrations in a compartment during thermal decomposition and combustion of materials 材料热分解和燃烧过程中送风和排风系统对隔间内气体浓度的影响
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-07 DOI: 10.1016/j.firesaf.2024.104201
R.S. Volkov, G.V. Kuznetsov, A.S. Sviridenko, P.A. Strizhak

Experiments were conducted on the detection of fires when using different operation modes of an indoor supply and exhaust ventilation system. The operating conditions of the supply and exhaust ventilation system were identified that exclude the formation of hazardous concentrations of products of thermal decomposition, gasification and combustion of class A materials (wood, cardboard and linoleum). The changes in the concentrations of the gas-air mixture components (CO, O2, CO2) were recorded in different operation modes of the supply and exhaust ventilation system and for different mechanisms of thermal decomposition and flame combustion initiation. The performance characteristics of the supply and exhaust ventilation system were determined that are necessary and sufficient for efficient operation of fire detection, containment and suppression systems.

对室内送排风系统的不同运行模式进行了火灾探测实验。确定了送排风系统的运行条件,以排除 A 类材料(木材、纸板和油毡)热分解、气化和燃烧产物形成的危险浓度。在送排风系统的不同运行模式下,以及在不同的热分解和火焰燃烧启动机制下,记录了气体-空气混合物成分(CO、O2、CO2)浓度的变化。确定了供气和排气通风系统的性能特点,这些特点对于火灾探测、遏制和灭火系统的有效运行是必要和充分的。
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引用次数: 0
A novel historical data-based method for predicting firefighters demand in urban fires 基于历史数据的预测城市火灾中消防员需求的新方法
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-06 DOI: 10.1016/j.firesaf.2024.104200
Chen-yue Zhang, Rui Zhao, Ning Wang, Xin Nie

Urban fires are a prevalent type of fire that requires prompt and effective responses. Determining the appropriate number of firefighters at the alarm time is crucial, but it mostly relies on the experience of decision-makers. Due to the fuzziness and limitations of human knowledge, there is often a deviation between the number of firefighters dispatched relying on personal subjective experience and the realistic demand. This paper proposed a historical data-based method for predicting the demand number of firefighters in urban fire. Initially, the National Fire Incident Reporting System (NFIRS) data and Global Historical Climatology Network Daily (GHCN-D) weather data were combined to create a fused dataset. The dataset was subjected to anomaly detection and feature selection, then the processed data was used to predict the number of firefighters using artificial neural network (ANN). In this process, the Genetic Algorithm (GA) was applied to optimize ANN structure. Finally, comparative experiments were conducted to evaluate the performance of the proposed method, which demonstrated superior accuracy in comparison to common regression models and traditional ANN. This advancement brings the number of dispatched firefighters closer to the actual demand and contributes to ensuring an adequate allocation of firefighters for urban fires. Consequently, decision-makers can make more informed decisions regarding the number of firefighters to dispatch, leading to more effective responses to urban fires.

城市火灾是一种普遍存在的火灾类型,需要迅速有效的应对措施。在报警时间确定适当的消防员人数至关重要,但这主要依赖于决策者的经验。由于人类知识的模糊性和局限性,依靠个人主观经验派遣的消防员人数往往与现实需求存在偏差。本文提出了一种基于历史数据的城市火灾消防员需求人数预测方法。首先,将国家火灾事故报告系统(NFIRS)数据和全球历史气候学网络每日(GHCN-D)天气数据结合起来,创建一个融合数据集。对数据集进行异常检测和特征选择,然后利用人工神经网络(ANN)对处理后的数据进行消防员人数预测。在此过程中,应用了遗传算法(GA)来优化 ANN 结构。最后,进行了对比实验来评估所提出方法的性能,结果表明,与普通回归模型和传统 ANN 相比,该方法具有更高的准确性。这一进步使派遣的消防员数量更接近实际需求,有助于确保为城市火灾分配足够的消防员。因此,决策者可以就派遣消防员的数量做出更明智的决定,从而更有效地应对城市火灾。
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引用次数: 0
Examining the cost-effectiveness of fire service prevention and youth engagement activities 研究消防服务预防和青年参与活动的成本效益
IF 3.1 3区 工程技术 Q1 Engineering Pub Date : 2024-06-05 DOI: 10.1016/j.firesaf.2024.104186
Sara Waring, Susan Giles, Pippa Carlton, Verity Buchanan

Many fire services have expanded their fire prevention focus to include other community-based risks, such as water safety, road safety, and youth engagement. However, to date, little research focus has been directed to examining the economic and social value of these wider prevention activities and whether they represent a wise resource investment. Further work is also needed to establish the reliability of existing fire prevention economic models. The following study adopts a cost-benefit analysis approach to economically evaluate the range of prevention activities delivered by one fire service in England (Merseyside), which focus on accidental dwelling fires, road, water, and arson-related incidents, and promoting youth engagement. Data was accessed from open sources and a systematic search of existing economic models and fire service records. Cost-benefit ratios demonstrated that the economic value provided by prevention investment was five and 21 times the investment for accidental and deliberate fires. Social value provided by youth engagement activities ranged from two to 13 times the investment for the Beacon Project and Fire Cadets. Findings pose important implications for informing fire sector discussions regarding the resourcing of prevention to address community risks, and for improving data collection to robustly model the economic and social value of activities.

许多消防部门已将防火重点扩展到其他社区风险,如水安全、道路安全和青少年参与。然而,迄今为止,很少有研究重点关注这些更广泛的预防活动的经济和社会价值,以及它们是否是明智的资源投资。还需要进一步开展工作,以确定现有防火经济模型的可靠性。以下研究采用成本效益分析方法,对英格兰默西塞德郡消防部门开展的一系列预防活动进行了经济评估,这些活动主要针对意外住宅火灾、道路火灾、水上火灾和纵火相关事件,以及促进青少年参与。数据来源于公开资料以及对现有经济模型和消防服务记录的系统搜索。成本效益比率表明,预防性投资的经济价值分别是意外火灾和蓄意火灾投资的 5 倍和 21 倍。青少年参与活动的社会价值是灯塔项目和消防学员投资的 2 到 13 倍。研究结果对消防部门讨论如何为预防工作提供资源以应对社区风险,以及改进数据收集工作以建立活动的经济和社会价值模型具有重要意义。
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引用次数: 0
Observations and impact of char layer formation and loss for engineered timber 对工程木材炭化层形成和损失的观察和影响
IF 3.4 3区 工程技术 Q1 Engineering Pub Date : 2024-06-04 DOI: 10.1016/j.firesaf.2024.104196
Laura Schmidt , Rory M. Hadden , Dilum Fernando

The char layer plays a critical role in the fire behaviour of engineered timber. Several chemical and physical processes can reduce char layer thickness and integrity. A series of experiments studied 12 cross-laminated timber (CLT) columns (130 × 790 × 125 mm WxHxD) exposed to combined thermal (20 kW/m2 or 50 kW/m2) and mechanical loading (39 kN, eccentric). Char loss from the surface lamella was observed and the impact of this on the thermal response of the timber studied. In all cases, unprotected CLT exhibited fall-off of charred pieces. Cracking, shrinkage and movement of char contributed significantly to the exposure of underlying timber sections to external heating. There was no direct correlation between char fall-off and the measured glue line temperature in this configuration. To enable comparison between CLT with and without char fall-off, a thin layer of glass fibre-reinforced polymer was added to the exposed surface of six samples which prevented all char fall-off. Retention of the char layer significantly decreased temperatures beneath the char layer, loss of section and burning duration compared to samples with char fall-off.

炭化层对工程木材的防火性能起着至关重要的作用。一些化学和物理过程可以减少炭化层的厚度和完整性。一系列实验研究了 12 根交叉层压木材(CLT)柱子(130 × 790 × 125 mm WxHxD),这些柱子暴露在热荷载(20 kW/m2 或 50 kW/m2)和机械荷载(39 kN,偏心)的双重作用下。观察了表面薄片的炭化损失,并研究了这对木材热反应的影响。在所有情况下,未受保护的 CLT 都会出现炭化块脱落的现象。裂缝、收缩和炭化移动在很大程度上导致下层木材暴露于外部加热。在这种结构中,木炭脱落与测量到的胶线温度之间没有直接关联。为了对有无木炭脱落的 CLT 进行比较,在六个样本的暴露表面添加了一薄层玻璃纤维增强聚合物,以防止所有木炭脱落。与有木炭脱落的样品相比,保留木炭层可大大降低木炭层下的温度、截面损失和燃烧持续时间。
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引用次数: 0
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