Požarne krivulje in temperaturni profili AB prečnih prerezov

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Jezik:	Slovenski jezik
Leto izida:	2012
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[A. Egart]
UDK:	614.8:624.07(043.2)
COBISS:	5986657
Št. ogledov:	2160
Št. prenosov:	350
Ocena:	0 (0 glasov)
Metapodatki:

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Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Fire curves and temperature profiles of reinforced concrete sections
Sekundarni povzetek:	The thesis introduces variety of fire scenarios. This are simplified methods for describing the intensity of fire and they give the development of gas temperatures in the vicinity of the element as a function of time. We divide the nominal and modelled fire curves. Nominal fire curves represent fully developed fire in a fire sector. Some of these curves are given in the SIST EN 1991-1-2 standard, like the standard curve temperature-time. Modelled fire curves are simplified model of natural fires, which are based on specific physical parameters with limited use. The parametric fire curve is also given in SIST EN 1991-1-2. For selected fire curves heat analysis is made, this means, that time distribution of the temperature across the reinforced cross section is determined. Heat conductors across reinforced section are described with partial differential equation of first order, translation of heat across the external surface due to convection and radiation is taken into account with the relevant border conditions. The system is solved with the finite element method. In a parametric study influence of the elements size and form of the cross sections on time distribution of the temperature with the use of fire curves is analysed. The temperature profiles of present reinforced cross sections are drawn for next characteristic periods: t=30 min, t=60 min and t=90 min.
Sekundarne ključne besede:	fire curves;temperature profiles;standard fire curve;parameter fire curve;temperature analysis
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo/naloga
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	xi, 35 str.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Fire curves and temperature profiles of reinforced concrete sections
Ključne besede (ePrints):	požarne krivulje;temperaturni profili;standardna požarna krivulja;parametrična požarna krivulja;temperaturna analiza
Ključne besede (ePrints, sekundarni jezik):	fire curves;temperature profiles;standard fire curve;parameter fire curve;temperature analysis
Povzetek (ePrints):	V diplomski nalogi predstavimo različne požarne krivulje. To so poenostavljene metode za opisovanje jakosti požara in podajajo spreminjanje temperature plinov v okolici elementa kot funkcijo časa. Ločimo nominalne in modelirane požarne krivulje. Nominalne požarne krivulje predstavljajo polno razvit požar v požarnem sektorju. Nekaj teh krivulj je podanih tudi v standardu SIST EN 1991-1-2, kot na primer standardna krivulja temperatura-čas. Modelirane požarne krivulje so poenostavljeni modeli naravnih požarov, ki temeljijo na specifičnih fizikalnih parametrih z omejeno možnostjo uporabe. Standard SIST EN 1991-1-2 podaja parametrično krivuljo temperatura-čas. Za izbrane požarne krivulje opravimo toplotno analizo, to pomeni, da določimo časovno razporeditev temperatur po AB prečnem prerezu. Prevajanje toplote po AB prerezu opišemo s parcialno diferencialno enačbo prvega reda, prehod toplote skozi zunanje površine zaradi konvekcije in radiacije pa upoštevamo z ustreznimi robnimi pogoji. Sistem rešimo z metodo končni elementov. V parametrični študiji analiziramo vpliv velikost in oblike prečnega prereza na časovno razporeditev temperatur in sicer pri uporabi različnih požarnih krivulj. Za obravnavane AB prečne prereze prikazujemo tudi temperaturne profile za naslednje karakteristične čase: t=30, 60 in 90 min.
Povzetek (ePrints, sekundarni jezik):	The thesis introduces variety of fire scenarios. This are simplified methods for describing the intensity of fire and they give the development of gas temperatures in the vicinity of the element as a function of time. We divide the nominal and modelled fire curves. Nominal fire curves represent fully developed fire in a fire sector. Some of these curves are given in the SIST EN 1991-1-2 standard, like the standard curve temperature-time. Modelled fire curves are simplified model of natural fires, which are based on specific physical parameters with limited use. The parametric fire curve is also given in SIST EN 1991-1-2. For selected fire curves heat analysis is made, this means, that time distribution of the temperature across the reinforced cross section is determined. Heat conductors across reinforced section are described with partial differential equation of first order, translation of heat across the external surface due to convection and radiation is taken into account with the relevant border conditions. The system is solved with the finite element method. In a parametric study influence of the elements size and form of the cross sections on time distribution of the temperature with the use of fire curves is analysed. The temperature profiles of present reinforced cross sections are drawn for next characteristic periods: t=30 min, t=60 min and t=90 min.
Ključne besede (ePrints, sekundarni jezik):	fire curves;temperature profiles;standard fire curve;parameter fire curve;temperature analysis
ID:	8312571