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Numerical study on the nonlinear thermomechanical behaviour of refractory masonry with dry joints

•A comparison is performed between two modelling approaches, the homogenisation approach (macro-modelling) and the micro-modelling approach.•Both modelling approaches provide a reliable prediction of masonry response at the ambient and high temperatures.•These modelling approaches can be used in com...

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Bibliographic Details
Published in:Engineering structures 2023-09, Vol.291, p.116468, Article 116468
Main Authors: Gajjar, Pratik N., Ali, Mahmoud, Sayet, Thomas, Gasser, Alain, Blond, Eric, Pereira, João M., Lourenço, Paulo B.
Format: Article
Language:English
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Summary:•A comparison is performed between two modelling approaches, the homogenisation approach (macro-modelling) and the micro-modelling approach.•Both modelling approaches provide a reliable prediction of masonry response at the ambient and high temperatures.•These modelling approaches can be used in combination. Refractory masonry with dry joints is widely employed as a protective lining in industrial applications requiring high-temperature treatments. The thermal and mechanical behaviour of alumina spinel refractory masonry is investigated for a wide range of mechanical loading conditions at ambient and high temperature up to 1500 °C within the framework of the ATHOR project. This paper discusses the different numerical analysis approaches for the simulation of the experimental results. Micro and macro modelling approaches show good agreement with the large scale uniaxial and biaxial compression tests for loading and unloading at the ambient temperature. Simulations carried out for large scale uniaxial and biaxial creep tests as well as biaxial relaxation tests at 1500 °C show good agreement. The numerical results indicate the ability of these modelling approaches to represent the complex thermomechanical behaviour of the refractory masonry. Both methods demonstrate an orthotropic and highly nonlinear behaviour of the refractory masonry as observed in the experimental campaign. The numerical outcome, validated with experimental results demonstrate compatibility between micro and macro modelling approach that can be employed to evaluate local and global behaviour of large industrial installations.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2023.116468