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https://hdl.handle.net/1822/68128
Título: | Finite element based micro modelling of masonry walls subjected to fire exposure: Framework validation and structural implications |
Autor(es): | Ravi Prakash, P. Azenha, Miguel Pereira, João Miguel Lourenço, Paulo B. |
Palavras-chave: | Thermo-mechanical analysis Masonry Fire resistance Nonlinear thermal gradients |
Data: | 2020 |
Editora: | Elsevier Science Ltd |
Revista: | Engineering Structures |
Resumo(s): | This paper presents a 2-D finite element (FE) based micro modelling framework for thermo-mechanical response history analysis of solid brick masonry structures subjected to fire. The 2-D FE framework considers geometric and material nonlinearities, and transient states of strain in conjunction with the temperature-dependent material properties. Material nonlinearity within the 2-D FE model is considered by the temperature-dependent total strain rotating crack model. The FE framework is validated against the thermo-mechanical response of a half-scale masonry wall subjected to one-sided fire exposure, and it is observed that the predictions of the FE framework are reasonably accurate. Utilizing the validated FE framework, thermo-mechanical response history characterization is performed on a full-scale masonry wall subjected to one-sided fire exposure. Critical physical phenomena which include thermal bowing, heat diffusion, unit-mortar thermo-mechanical interaction, cracking and stress profiles within the masonry structures are studied intricately. Furthermore, thermo-mechanics within representative volumes enclosing unit as well as mortar and their correlation with the global thermo-mechanical response is studied. Such 2-D micro-scale thermo-mechanical computations on masonry walls followed by a detailed discussion on their thermo-mechanics are one of the novel features of the present study. It is observed that thermal bowing resulted from a complex interaction between thermal dilation and cracking and crushing in the mortar and unit within the masonry structure. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/68128 |
DOI: | 10.1016/j.engstruct.2020.110545 |
ISSN: | 0141-0296 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S0141029619331931 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | ISISE - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Ravi et al. EngStruct_2020.pdf | 1,66 MB | Adobe PDF | Ver/Abrir |