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Avtorstvo: Jana ŠELIH // 1.08 Objavljeno predavanje na znanstveni konferenci
Leto: 1999
Citat: ŠELIH, Jana, SOUSA, Antonio C. M. Numerically assessed behaviour of concrete walls exposed to fire. V: DHIR, Ravindra K. (ur.), MCCARTHY, Michael J. (ur.). Concrete durability and repair technology : proceedings of the international conference held at the University of Dundee, Scotland, UK on 8-10 September 1999. London: Thomas Telford, 1999, str. 731-738.
Povzetek: An analysis combines heat and mass transport with the calculation of thermal stresses due to non-uniform temperature distribution is presented for a concrete wall exposed to a short duration high intensity fire scenario. The mathematical formulation of simultaneous heat and mass transfer is based on the averaging procedure over a representative elementary volume of the porous medium, and the calculation of the thermal stresses assumes elastic strains only. Particular attention is given to the effect upon the wall response of the modulus of elasticity changes induced by temperature, which, as the results indicate, have a pronounced influence upon the stress distribution in a fire-exposed wall. The results also indicate that thermal stresses higher than those resulting from vapour trapped within the material may develop in concrete walls exposed to fire conditions.

V članku je prikazana analiza betonske stene, izpostavljene požaru. Analiza temelji na kombiniranem modelu simultanih toplotnih in masivnih pretokov in toplotnih napetosti zaradi neenakomerne porazdelitve temperature v prerezu stene. Izbrani model za požar je SDHI (short duration high intensity) tipa. Rezultati kažejo, da so toplotne napetosti zelo velike v primerjavi s pornimi pritiski v betonu med požarom.
Tipologija: 1.08 Objavljeno predavanje na znanstveni konferenci
COBISS ID 262247 Polni zapis iz sistema COBISS
Vpisal 2001/08/08 19:56