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Fire resistance of RC columns with regard to spalling of concrete
ID Bajc, Urška (Avtor), ID Kolšek Češarek, Jerneja (Avtor), ID Planinc, Igor (Avtor), ID Bratina, Sebastjan (Avtor)

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Izvleček
At date a common agreement seems to be established among researchers that for a proper prediction of fire-induced concrete spalling on structural fire resistance a fully-coupled thermo-hygro-mechanical model should be used in general. Such sophisticated models may engage complex systems of equations. For everyday practical applications, however, the accompanying computational procedures may be found to time-consuming. Proper input material data such as permeability tensor and diffusion coefficients may be found difficult to define as well, especially for modern special-type concretes. Thus, simplified procedures for rough assessments of spalling are still desirable. For reinforced concrete (RC) columns, one of such is proposed here. The model combines two essential analyses, i.e. a hydro-thermal and a mechanical analysis, and runs them separately but simultaneously. For rough estimation of spalling different semi-empirical criteria are used. They consider concrete pore pressure, velocity of spalled-off pieces and buckling length of delaminated concrete. The proposed model is validated against experimental data and shows promising results. In the final part of the paper, the model is implemented in an investigation of the effects of different spalling scenarios on a fire-engulfed column. This shows that spalling may reduce its ultimate fire resistance as much as by 70%.

Jezik:Angleški jezik
Ključne besede:RC column, fire, spalling, simplified procedure, buckling
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
Leto izida:2022
Status objave pri reviji:Objavljeno
Verzija članka:Založnikova različica članka
Datum objave:01.06.2022
Št. strani:15 str.
Številčenje:Letn. 130
PID:20.500.12556/RUL-138588 Povezava se odpre v novem oknu
UDK:624.012.45:624.075.2
ISSN pri članku:0379-7112
DOI:10.1016/j.firesaf.2022.103568 Povezava se odpre v novem oknu
COBISS.SI-ID:113518851 Povezava se odpre v novem oknu
Datum objave v RUL:29.07.2022
Število ogledov:68
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Gradivo je del revije

Naslov:Fire safety journal
Skrajšan naslov:Fire saf. j.
Založnik:Elsevier
ISSN:0379-7112
COBISS.SI-ID:25463040 Povezava se odpre v novem oknu

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:AB steber, požar, luščenje, poenostavljena metoda, uklon

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0158
Naslov:Gradbene konstrukcije in gradbena fizika

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0260
Naslov:Mehanika konstrukcij

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