Naslov
3D Thermo-hygro-mechanical model for concrete

Autori
Ožbolt, Joško ; Periškić, Goran ; Eligehausen, Rolf

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

Izvornik
Fracture Mechanics of Concrete and Concrete Structures - Proceedings of the 6th international conference on fracture mechanics of concrete and concrete structures / Taylor & Francis - Leiden : BALKEMA, 2007, 17-22

ISBN
978-80-01-03762-1

Skup
Fracture Mechanics of Concrete and Concrete Structures

Mjesto i datum
Catania, Italija, 17.06.2007. - 22.06.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Concrete; Fracture; Transport processes; Finite Elemens; Spalling

Sažetak
In the present paper numerical analysis of spalling of concrete at high temperature is discussed. For a given boundary conditions the distribution of moisture, pore pressure, temperature, stresses and strains is calculated by employing a three-dimensional transient finite element analysis. The used thermo-hygro-mechanical model accounts for the interaction between hygro and thermal properties of concrete. Moreover, these properties are coupled with the mechanical properties of concrete, i.e. it is assumed that the mechanical properties (damage) have an effect on the distribution of moisture (pore pressure) and temperature. The mechanical strain, which is due to loading, temperature induced stresses and pore pressure, is calculated by employing temperature dependent microplane model for concrete. To study spalling of concrete cover, a 3D finite element analysis of a concrete slab, which was locally exposed to high temperature, is performed. In the analysis are varied thermo-hygro and mechanical properties of concrete. It is shown that relatively high pore pressure in concrete can cause spalling of concrete cover. The results show 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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