Fire Research最新文献

VIRGILE project: The concept of virtual fire resistance facility for the assessment of construction products performance VIRGILE项目:虚拟防火设施的概念，用于评估建筑产品的性能

Fire Research Pub Date : 2019-10-15 DOI: 10.4081/fire.2019.72

Gildas Auguin, V. Dréan

引用次数: 0

Synthesis of silica nanoparticles to enhance the fire resistance of cement mortars 纳米二氧化硅的合成提高水泥砂浆的耐火性能

Fire Research Pub Date : 2019-10-11 DOI: 10.4081/fire.2019.77

Joana Vaz-Ramos, A. Santiago, A. Portugal, L. Durães

{"title":"Synthesis of silica nanoparticles to enhance the fire resistance of cement mortars","authors":"Joana Vaz-Ramos, A. Santiago, A. Portugal, L. Durães","doi":"10.4081/fire.2019.77","DOIUrl":"https://doi.org/10.4081/fire.2019.77","url":null,"abstract":"Silica nanoparticles are known to enhance the strength and durability of cementitious materials, due to their nanofilling effect and their high pozzolanic reactivity. They also have the potential to improve their thermal properties and fire resistance. However, these improvements are highly dependent on the nanoparticles’ characteristics. In this work, silica nanoparticles were prepared by sol-gel reaction and a design of experiments with four factors was used to conclude about the parameters that have more influence in the synthesis of these nanoparticles and, thus, optimize this process and the particles’ properties. Using a lower ethanol/water, higher hydrolysis and condensation time and higher volume of catalyst, the smallest particle size was obtained (118 nm). The effect of the incorporation of these silica nanoparticles into cement mortars was studied in terms of density and thermal conductivity of these mortars, after curing at room temperature. The presence of silica nanoparticles led to an increase in density and decrease of thermal conductivity. The mortars were also exposed to high temperature, which originated a significant reduction (~50%) in their thermal conductivity.","PeriodicalId":229102,"journal":{"name":"Fire Research","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114906805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Proposal of new expressions for the calculation of section factor on structural steel columns in contact with walls 提出了与墙体接触钢柱截面系数计算的新表达式

Fire Research Pub Date : 2019-10-11 DOI: 10.4081/fire.2019.73

António J. M. Correia, P. Lopes, J. Rodrigues, J. Correia

{"title":"Proposal of new expressions for the calculation of section factor on structural steel columns in contact with walls","authors":"António J. M. Correia, P. Lopes, J. Rodrigues, J. Correia","doi":"10.4081/fire.2019.73","DOIUrl":"https://doi.org/10.4081/fire.2019.73","url":null,"abstract":"The fire resistance of a steel column is highly affected by the contact between the columns and the walls, leading in general to a favorable effect due to the reduction of temperatures. However, it leads to the Thermal Bowing effect, which is not more than a differential heating in the steel cross sections, causing an inversion of bending moments and an inversion of the deflections of the column. Thus, it is necessary to accurately assess the evolution of the temperature field in the cross section of the steel elements in contact with walls. In Eurocode 3 part 1-2, the structural design of steel elements in fire situation is performed with expressions for the calculation of the section factor of steel profiles, but different cases of positioning the columns and the surrounding walls could be considered as causing extremely high thermal gradients. In this paper, a new approach for the calculation of section factors for cases not included in table 4.2 of Eurocode 3, part 1- 2 are presented. This was achieved using numerical models with finite element modelling with the ABAQUS program, varying the cross-section of the columns, orientation of the web in relation to the walls, and the position and thickness of the walls, to achieve the desired section factors.","PeriodicalId":229102,"journal":{"name":"Fire Research","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132278367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermo-structural analysis of reinforced concrete beams 钢筋混凝土梁的热结构分析

Fire Research Pub Date : 2019-10-11 DOI: 10.4081/fire.2019.74

D. Pires, Rafael C. Barros, R. Silveira, Í. Lemes, P. A. S. Rocha

{"title":"Thermo-structural analysis of reinforced concrete beams","authors":"D. Pires, Rafael C. Barros, R. Silveira, Í. Lemes, P. A. S. Rocha","doi":"10.4081/fire.2019.74","DOIUrl":"https://doi.org/10.4081/fire.2019.74","url":null,"abstract":"The objective of this study is to simulate the behavior of reinforced concrete beams in fire situation. In order to achieve this objective, advanced numerical formulations were developed, implemented and evaluated. When exposed to high temperatures, the properties of the material deteriorate, resulting in the loss of strength and stiffness. To achieve the goal, two new modules within the Computational System for Advanced Structural Analysis were created: Fire Analysis and Fire Structural Analysis. The first one aims to determine the temperature field in the cross section of structural elements through thermal analysis by using the Finite Element Method (FEM). The second was designed to perform the second-order inelastic analysis of structures under fire using FEM formulations based on the Refined Plastic Hinge Method coupled with the Strain Compatibility Method. The results obtained of the nonlinear analyses of two reinforced concrete beams under high temperature were compared with the numerical and experimental solutions available in literature and were highly satisfactory. These results also showed that the proposed numerical approach can be used to study the progressive collapse of other reinforced concrete structures in fire situation and extended to the numerical analysis of composite structures under fire condition.","PeriodicalId":229102,"journal":{"name":"Fire Research","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133123141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Thermal properties of fired clay bricks from waste recycling. A review of studies 回收废烧制粘土砖的热性能研究。研究综述

Fire Research Pub Date : 2019-10-11 DOI: 10.4081/fire.2019.71

A. Ramos, M. Sáez, M. A. Rodriguez, M. Antón, Jesús Gómez, P. Piloto

引用次数: 0

Mechanical analysis of a portal steel frame when subjected to a post-earthquake fire 震后火灾作用下门式钢框架的力学分析

Fire Research Pub Date : 2019-10-11 DOI: 10.4081/fire.2019.76

M. Merouani, B. Lamri, A. Kada, P. Piloto

{"title":"Mechanical analysis of a portal steel frame when subjected to a post-earthquake fire","authors":"M. Merouani, B. Lamri, A. Kada, P. Piloto","doi":"10.4081/fire.2019.76","DOIUrl":"https://doi.org/10.4081/fire.2019.76","url":null,"abstract":"Although current design code can manage the separate action of a fire or an earthquake, which causes a significant threat to the human life and to the integrity of the structures, the dual effect of a Post- Earthquake Fire (PEF) stands as a major hassle to designers and rescuers alike. Algerian seismic design code, RPA99v2003, with no exception does not consider the possibility of a subsequent fire after an earthquake, whose effect can significantly weaken the steel frame and destroy its fire protection. This paper presents the evaluation of the fire resistance for a two-storey steel portal frame, damaged by an earthquake simulated through spectrum response of Chlef, scaled three in the Algerian Seismic Code. First, the design of the steel structure considers seismic actions by a static nonlinear analysis. Second, it is followed by a fire analysis using an ISO834 standard fire model, considering that the structure is partially damaged. The finite element simulation and numerical analysis of the structure in post-earthquake fire condition yield the bilinear capacity curve at ambient temperature and the variation of local and global displacement at high temperature. A final comparison of the damaged (PEF) and undamaged (FIRE) frames subjected to the different fire scenarios is done.","PeriodicalId":229102,"journal":{"name":"Fire Research","volume":"1467 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124786544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Influence of different merging angles of pedestrian flows on evacuation time 不同行人流合并角度对疏散时间的影响

Fire Research Pub Date : 2019-10-11 DOI: 10.4081/fire.2019.75

M. Nappi, Ivana Righetto Moser, J. C. Souza

{"title":"Influence of different merging angles of pedestrian flows on evacuation time","authors":"M. Nappi, Ivana Righetto Moser, J. C. Souza","doi":"10.4081/fire.2019.75","DOIUrl":"https://doi.org/10.4081/fire.2019.75","url":null,"abstract":"The growing number of fires and other types of catastrophes occurring at large events highlights the need to rethink safety concepts and also to include new ways to optimize buildings and venues where events are held. Although there have been some attempts to model and simulate the movement of pedestrian crowds, little knowledge has been gathered to better understand the impact of the built environment and its geometric characteristics on the crowd dynamics. This paper presents computer simulations about pedestrians’ crowd dynamics that were conducted based on the Social Force Model. The influence of different configurations of pedestrian flows merging during emergency evacuations was investigated. In this study, 12 designs with different merging angles were examined, simulating the evacuation of 400 people in each scenario. The Planung Transport Verkehr (PTV, German for Planning Transport Traffic) Viswalk module of the PTV Vissim software (PTV Group, Karlsruhe, Germany) program was adopted, which allows the employment of the Social Force approach. The results demonstrate that both symmetric and asymmetric scenarios are sensitive to the angles of convergence between pedestrian flows.","PeriodicalId":229102,"journal":{"name":"Fire Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130640628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of intumescent coatings in cone calorimeter and open pool fires 膨胀涂层在锥形量热仪和明池火灾中的性能

Fire Research Pub Date : 2019-06-21 DOI: 10.4081/FIRE.2019.45

S. Singh, S. Shivani, S. Siddapureddy, Siddini Venkatesh Prabhu

{"title":"Performance of intumescent coatings in cone calorimeter and open pool fires","authors":"S. Singh, S. Shivani, S. Siddapureddy, Siddini Venkatesh Prabhu","doi":"10.4081/FIRE.2019.45","DOIUrl":"https://doi.org/10.4081/FIRE.2019.45","url":null,"abstract":"Accidental fire is a major concern in terms of safety of infrastructures and human lives. With the technological advancement, several novel methods are developed for minimizing the damages caused by the fire. One of the methods is to paint the base metals/ material with fire retardant coatings which can increase the lead time so that economic destruction and loss of human lives can be avoided. In this work, the performance of the intumescent coating (passive type fire retardant coatings) is studied with the help of cone calorimeter and open pool diesel fire as sources of heat. The transient temperature distribution for bare Stainless Steel 310 plate suggests that the cone calorimeter experiments alone cannot suffice for mimicking real life conditions. Comparison of the behavior of the available paints in cone calorimeter and open pool fire confirms that the performance of intumescent coatings in cone calorimeter is very different from that in open pool fire. The safe initial thickness of the intumescent coating is a function of heat release rate of the source. The effective thermal conductivity of the intumescent coatings is evaluated using one dimensional conduction heat equation with constant boundary temperature condition.","PeriodicalId":229102,"journal":{"name":"Fire Research","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127966272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thermal and structural analysis of a fuel storage tank under an adjacent pool fire 邻池火灾下燃料储罐的热与结构分析

Fire Research Pub Date : 2018-08-22 DOI: 10.4081/FIRE.2018.48

Susana N. Espinosa, R. C. Jaca, L. Godoy

引用次数: 6

Effect of radiation inside square hollow section under moderate non-symmetric fire 中度非对称火灾下方形空心截面内辐射的影响

Fire Research Pub Date : 2018-08-09 DOI: 10.4081/FIRE.2018.42

Jolanta Bączkiewicz, S. Pajunen, M. Heinisuo

引用次数: 1