Publicação
Evaluation of the performance of steel fibre reinforced self-compacting concrete in elevated slab systems; from the material to the structure
| Resumo: | The advent of steel fibre reinforced self-compacting concrete (SFRSCC) complemented the continuous advances in concrete technology to respond the growing need for a new generation of cement-based materials with advanced mechanical properties in civil engineering applications. The additional resistance to the crack opening governed by the bridging mechanism of fibres leads to a significant improvement in the fracture toughness and ductility of the SFRSCC. The present work aims to explore the potentialities of the post-cracking response of SFRSCC in elevated (E-SFRSCC) slab system where due to the support redundancy character of the structure, the benefits of SFRSCC are more efficiently mobilised and the stress redistribution capacity provides an ultimate load that is much greater than the load at crack initiation. Therefore, in this structural system, the conventional reinforcement of slab can be substituted by the reinforcing mechanism of discrete fibres. In an extensive experimental programme, the post-cracking response of different series of SFRSCCs was characterised, at the material levels, through various approaches conventionally used in the literature. In this experimental programme, the influence of the test methodology was evaluated on the derived constitutive laws of SFRSCC. At the structural level, a quarter-scale prototype of E-SFRSCC was built and tested for assessing the performance of this structural system under serviceability and ultimate limit state conditions. These two experimental levels are correlated with each other by performing advanced FEMbased numerical simulations. Furthermore, a novel methodology is presented based on the yield line theory which is capable of taking into consideration the volume fraction of fibres and the fibre segregation on the height of slab’s cross section to predict the load carrying capacity of ESFRSCC slab panels under the uniformly distributed and concentric load. |
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| Autores principais: | Salehian, Hamidreza |
| Ano: | 2015 |
| País: | Portugal |
| Tipo de documento: | tese de doutoramento |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The advent of steel fibre reinforced self-compacting concrete (SFRSCC) complemented the continuous advances in concrete technology to respond the growing need for a new generation of cement-based materials with advanced mechanical properties in civil engineering applications. The additional resistance to the crack opening governed by the bridging mechanism of fibres leads to a significant improvement in the fracture toughness and ductility of the SFRSCC. The present work aims to explore the potentialities of the post-cracking response of SFRSCC in elevated (E-SFRSCC) slab system where due to the support redundancy character of the structure, the benefits of SFRSCC are more efficiently mobilised and the stress redistribution capacity provides an ultimate load that is much greater than the load at crack initiation. Therefore, in this structural system, the conventional reinforcement of slab can be substituted by the reinforcing mechanism of discrete fibres. In an extensive experimental programme, the post-cracking response of different series of SFRSCCs was characterised, at the material levels, through various approaches conventionally used in the literature. In this experimental programme, the influence of the test methodology was evaluated on the derived constitutive laws of SFRSCC. At the structural level, a quarter-scale prototype of E-SFRSCC was built and tested for assessing the performance of this structural system under serviceability and ultimate limit state conditions. These two experimental levels are correlated with each other by performing advanced FEMbased numerical simulations. Furthermore, a novel methodology is presented based on the yield line theory which is capable of taking into consideration the volume fraction of fibres and the fibre segregation on the height of slab’s cross section to predict the load carrying capacity of ESFRSCC slab panels under the uniformly distributed and concentric load. |
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