Naslov
Numerical Modelling of Explosive Failure of Concrete due to Fire

Autori
Periškić, Goran ; Ožbolt, Joško ; Jelčić, Marija

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

Izvornik
Proceedings of the First International Conference on Computational Technologies in Concrete Structures (CTCS'09) / Choi, C.K. ; Meyer, C. ; Bićanić, N. - Daejeon : Techno-Press, 2009, 1389-1399

ISBN
978-89-89693-26-0

Skup
Conference on Computational Technologies in Concrete Structures (1 ; 2009)

Mjesto i datum
Jeju City, Republika Koreja, 24.05.2009. - 27.05.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
concrete spalling; numerical modelling; fire loading

Sažetak
In the present paper a three-dimensional thermo-hygro mechanical model for concrete and its application in the numerical analysis of explosive spalling of concrete at high temperature present and discussed. The model is formulated in the framework of continuum mechanics under assumption of validity of irreversible thermodynamics. The response of the model is controlled by the following unknown variables: temperature, pore pressure, (moisture), stresses and strains. The distribution of temperature, pore pressure and moisture (thermo-hygro properties) depends on damage of concrete. Moreover, the relevant mechanical properties, Young's modulus, tensile strength, compressive strength and fracture are temperature dependent. The mechanical strain, which is due to loading, temperature induced stresses and pore pressure and pore pressure, is calculated by employing temperature dependent microplane model. Modelling of transport processes in concrete is based on a single phase model (Bažant and Kaplan, 1996). To study explosive spalling of concrete cover, a 3D finite element analysis of a concrete slab made of high strength concrete, which is locally exposed to high temperature, is performed. In the analysis are varied thermo-hygral (humidity and permeability), mechanical properties of concrete and loading (heating) rate. The results indicate that relatively high pore pressure in concrete can cause spalling of concrete cover and that the governing parameter that controls spalling is the permeability of concrete.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti

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