Determination of Fire Resistance of Ceiling Structure Variant Design on the Basis of Timber Using Numerical Calculation Methods

2016 ◽  
Vol 820 ◽  
pp. 379-384
Author(s):  
Róbert Leško ◽  
Martin Lopušniak
Keyword(s):  
High Temperature ◽  
Numerical Calculation ◽  
Fire Resistance ◽  
Building Materials ◽  
Effective Alternative ◽  
Fire Tests ◽  
Calculation Methods ◽  
Variant Design ◽  
Temperature Impacts

Ability to resist of high temperature impacts during fire is not based exclusively on ignitability of building materials. At the present time, fire resistance is declared mainly through fire tests, but numerical procedures for the determination of fire resistance also represent an effective alternative in this field. Using calculation methods for the determination of ceiling structure fire resistance on the basis of timber is subject of the submitted paper. The main objective of this paper is to demonstrate the fact that timber, or products from it, are building materials capable to resist impacts of fully developed fire for the period of more than 60 minutes in spite of their flammability. Applicability of these results in selected countries of Europe can be seen from the list of requirements.

scholarly journals THE BEHAVIOUR OF SPECIAL OSB BOARDS UNDER FIRE CONDITIONS, The influence of OSB board´s fire coating on the fire resistance of light timber frame assemblies

2016 ◽  
Author(s):  
Petr Kuklík ◽  
Magdaléna Charvátová
Keyword(s):  
Fire Resistance ◽  
Fire Test ◽  
Test Laboratory ◽  
Fire Tests ◽  
Load Bearing ◽  
Timber Frame ◽  
Charring Rate ◽  
Fire Conditions

The paper is focused on the influence of fire resistant coatings used on OSB boards on the fire resistance of entire light timber frame wall assemblies. Two fire tests were performed in the fire test laboratory of PAVUS, a.s. in Veselí nad Lužnicí. The fire tests were performed on a load bearing wall. The wall dimensions were 3.0 (depth) x 3.0 (height) m. According to EN 1995-1-2, the calculation for fire paints and coatings is not possible. The aim of the paper is the determination of the influence of this type of coating on the OSB board’s charring rate, the determination of the start of charring of a timber stud and the fire resistance of the whole construction.

scholarly journals Critical ignition conditions in exothermically reacting systems for arbitrary reaction kinetics

2016 ◽  
Vol 472 (2192) ◽  
pp. 20160529 ◽  
Author(s):  
Valeriy Yu. Filimonov ◽  
Konstantin B. Koshelev
Keyword(s):  
High Temperature ◽  
Numerical Calculation ◽  
Analytical Calculation ◽  
Maximum Temperature ◽  
Universal Method ◽  
Exothermic Reactions ◽  
Calculation Results ◽  
Critical Ignition ◽  
Reacting Systems

In this work, a universal method for determination of the critical ignition conditions taking into account the reactant consumption is proposed. Based on the analysis of the phase trajectories equation, the equation for maximal temperatures of exothermic reactions was obtained. In this case, the asymptotic criterion of ignition is determined by the impossibility of slow reaction mode realization with low value of maximum temperature. The method allows demarcating the regions of low- and high-temperature modes of exothermic reactions and to establish the criteria of transition to the region of high-temperature modes. The corresponding parametric diagrams can be characterized as the bifurcation ones (bistability). It was found that the region of thermal explosion (TE) existence is bounded by the classical TE conditions from below and by the degeneration conditions from above. The comparison of analytical calculation results with the results of numerical calculation gives a satisfactory agreement.

Complexation equilibria between uranium(VI) and 2-(2’-thiazolylazo)-4,6-dimethylphenol and 2-(4’,5’-dimethyl-2’-thiazolylazo)-4,6-dimethylphenol. Extraction-spectrophotometric determination of uranium

1988 ◽  
Vol 53 (2) ◽  
pp. 258-268 ◽  
Author(s):  
Brígida Santana ◽  
María J. Sánchez ◽  
Juan J. Arias ◽  
Francisco García-Montelongo
Keyword(s):  
Numerical Calculation ◽  
Sulphuric Acid ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Acid Leaching ◽  
Ionization Constants ◽  
Water Medium ◽  
Calculation Methods ◽  
Spectrophotometric Methods

2-(2’-Thiazolylazo)-4,6-dimethylphenol (TADMP) and 2-(4’,5’-dimethyl-2’-thiazolylazo)-4,6-dimethylphenol (DMTADMP) have been synthesized and their ionization constants determined by spectrophotometric methods and graphical and numerical calculation methods. Both reagents form UO2R+ and UO2R2 complexes with uranium (TADMP: log β101 = 9.18 ± 0.02, log β102 = 17.64 ± 0.01; DMTADMP: log β101 = 8.38 ± 0.02, log β102 = 18.78 ± 0.14) in a 40% (v/v) ethanol-water medium at I = 0.25 (NaClO4). An extraction-spectrophotometric method for the determination of 1.35-9.45 ppm uranium based on its extraction into toluene with TADMP from a pH 6.5 buffered medium has been developed ( ε = 1.6 . 104 l mol-1 cm-1 at 580 nm), and applied to its determination in sulphuric acid leaching residues.

scholarly journals CALCULATION METHODS OF HIGH TEMPERATURE DISTRIBUTION WITHIN STRUCTURAL COMPONENTS AND APPLICATION OF THESE METHODS TO FIRE RESISTANCE ASSESSMENT /AUKŠTŲ TEMPERATŪRŲ PASISKIRSTYMO STATYBINĖSE KONSTRUKCIJOSE SKAIČIAVIMO BŪDAI IR JŲ TAIKYMO ANALIZĖ ĮVERTINANT ATITVARŲ ATSPARUMĄ UGNIAI

2001 ◽  
Vol 7 (5) ◽  
pp. 391-396
Author(s):  
Romualdas Mačiulaitis ◽  
Kęstutis Lukošius
Keyword(s):  
High Temperatures ◽  
Fire Resistance ◽  
Material Properties ◽  
Thermal Conduction ◽  
Building Materials ◽  
Heat Exposure ◽  
Thermal Characteristics ◽  
Calculation Methods ◽  
Normal Environment ◽  
Temperature Conduction

Fire resistance of a building structure is one of important properties which describes the behaviour of the structure exposed to fire. Performance based on codes allows to use calculation methods. Given a satisfactory characterisation of the heat exposure, the designer may then compute how quickly temperatures will increase at various sections within the structural component. There are many calculation methods. They can divided into three groups (Fig 1): using experimental data, using both temperature conduction process and non-stationary thermal conduction. Thermal conduction, temperature conduction and thermal capacitance are general properties for temperature prediction methods. Usually building materials have thermal characteristics for normal environment, which can not exactly describe material properties at high temperatures. But many calculation methods lack accurate thermal characteristics describing building material properties at high temperatures. This article is intended for the analysis of this question.

scholarly journals Ignitability small attack flame fire test of gypsum composite reinforced with natural fibres

2019 ◽  
Vol 10 (1) ◽  
pp. 57-61
Author(s):  
Jiří Teslík ◽  
Markéta Hošťálková ◽  
Nikola Vavřínová
Keyword(s):  
Composite Materials ◽  
Building Materials ◽  
Fire Test ◽  
Natural Fiber ◽  
Natural Fibres ◽  
Fire Tests ◽  
Flame Resistance ◽  
Building Products

Ignitability is one of the parameters that characterize the behaviour of building materials on flame action. The Ignitability Small Attack Flame fire test is used for the classification of building products by their reaction to fire. On the basis of the Ignitability fire test it can be determined that the tested material will be classified into the class E by reaction to fire. The Ignitability Small Attack Flame fire test precede the Single Burning Item fire test, that is used for classification of building products to class D, C, B, A2. The results of the Ignitability fire test were carried out as part of the research on the properties of gypsum composite with natural fiber reinforcement. As part of the research series of ignitability tests on two types of gypsum composite were carried out. The first type was a gypsum composite reinforced with straw fibres. The second type was composite reinforced with wooden fibres. Developed composite materials could be used in the future as board materials and therefore the determination of their fire parameters is a very important part of research. The results of the fire tests have shown that the developed material has a very good flame resistance.

scholarly journals Fire barrier based on expanded perlite composites

2019 ◽  
Author(s):  
Robert Kusiorowski ◽  
Jerzy Witek ◽  
Izabela Majchrowicz ◽  
Andrzej Kleta ◽  
Anna Jirsa-Ociepa
Keyword(s):  
Fire Resistance ◽  
Fire Safety ◽  
Building Materials ◽  
Expanded Perlite ◽  
Board Thickness ◽  
Fire Barrier ◽  
Safety Systems ◽  
Economic Considerations

Decreased strength of building materials as a result of flame impingement (e.g. during a fire) is one of major threats in the construction branch. For these reasons, the effectiveness of fire safety systems in various kinds of facilities or structures is extremely important. One of the determinants of this effectiveness is so-called fire insulation, i.e. time expressed in minutes after which an increase in the temperature of a protected structure or facility exceeds a certain admissible value (140 °C). The results of investigations presented in the article concern the determination of the effect of various mineral binders used in the manufacture of insulation boards from expanded perlite on fire resistance and, in consequence, on extending the time of fire insulation in the conditions of cellulose and hydrocarbon fire. The conducted research has revealed that the fire resistance of perlite products can be modelled by selecting adequate mineral binders, with respect to specific applications and economic considerations. Insulation boards based on expanded perlite – depending on the binder used – were characterized by a fire insulation ranging (with a board thickness of 50 mm) from 50 to 100 minutes in the conditions of cellulose fire and from 20 to 30 minutes in the conditions of hydrocarbon fire.

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