Naslov
Calculation of temperature curves under the influence of actual fires in steel halls

Autori
Peroš, Bernardin ; Boko, Ivica

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
EUROSTEEL 2002 / Lamas, Antonio ; Simoes da Silva, Luis - Lisabon : Multicomp, 2002, 1345-1354

Skup
EUROSTEEL 2002

Mjesto i datum
Coimbra, Portugal, 19.09.2002. - 20.09.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Actual Fire Load; Large compartment; Zone Model; Temperature Curves; Code

Sažetak
According to current scientific research findings in the field of fires, their breakout and growth (development/expansion), it is not possible to predict the where and when a fire might break out. Fires in industrial objects can be caused by various factors, the most significant being man. Most fires are caused by men either directly (sabotage, bombing) or indirectly (malfunctions due to improper maintenance) and only a small part of fires is caused by natural disasters. The products of a fire are: the development of high temperatures and great quantities of smoke in enclosures. High temperatures influence the supporting structure of the building, while smoke threatens humans, since most loss of life in fires is caused by smoke inhalation. This paper deals only with the effect of high temperatures upon the supporting steel structure. During the last few years significant efforts have been made in scientific research to understand the process of the breakout of fires and their growth so that there is a specific scientific discipline referred to as “Fire Science”. Immediately after ignition a fire displays characteristics of a fire in open space. During the expansion period, the average temperature in the enclosure is low and the fire is localised. The heat released by gases heats the material which has not yet burst into flames. The transition from the fire breakout into a fully developed fire occurs as soon as the flames reach the ceiling and expand along it. Then high temperatures develop which can cause the collapse of the supporting structure. That phase is followed by the combustion phase which is characterised by a decrease in temperature of the enclosure. Fire in industrial buildings passes through all these phases unless the fire expansion has been prevented by various means (sprinklers, fire brigades). These problems have been dealt with in ENV 1991-2-2: 1995, wherein fire action is classified as heat action, i.e. accidental action in the classification of various actions. Heat actions are defined by: nominal temperature-time curve and parametric fire exposure. Parametric fire exposures have been only initiated and it has been left to each country to solve this within the National Application Documents which is one of the main tasks of this paper. During the recent years various numerical models have been developed which attempt to simulate actual fire loads and the results are compared with actual, i.e. experimental fires.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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