Publicação
Structural behavior of hybrid GFRP and steel reinforced FRC prestressed beams
| Resumo: | The present thesis intended to contribute for the development of a new generation of high durable and sustainable reinforced concrete (RC) beam structures submitted to flexural loading, by combining the benefits that Glass Fiber Reinforced Polymers (GFRP) and steel bars can provide: the former due to their corrosion immunity, and the latter derived from their high ductility. Furthermore, High Performance Fiber Reinforced Concrete (HPFRC) was developed to improve the ductility of such innovative structures. To avoid corrosion, steel bar was placed with a HPFRC cover thickness, higher than 100 mm, while GFRP bars were applied in the near tensile surface of the HPFRC beams. In addition, the GFRP and steel bars were applied with a certain pre-stress level. The prestressing optimized their reinforcing capabilities, and increased the service load carrying capacity of the beam. On the other hand, conventional shear reinforcements were not used, and they were totally replaced by HPFRC material. Due to the quite high post-cracking tensile strength and energy absorption capacity that HPFRC attained, the composite system showed adequate shear resisting, and also enhancement in the structural performance at both Serviceability and Ultimate Limit States (SLS and ULS). The work started with the assessment to bond behavior between GFRP and HPFRC through experimental tests and analytical investigation. The structural performance of this hybrid prestressed GFRP-steel reinforced HPFRC was investigated by performing four-point bending tests on beams with I-shaped cross section under both monotonic and fatigue loading conditions. Moreover, an extensive analytical formulation was developed in order to theoretically address to the main structural aspect of the tested beams. The obtained experimental results were captured well using the respective results from the analytical study. Finally, finite element (FE) simulations were carried out using two well-known modelling approaches available in the literature for concrete elements in form of both 2D and 3D models. The results obtained from these models were promising, a |
|---|---|
| Autores principais: | Mazaheripour, Hadi |
| Assunto: | GFRP strand HPFRC FE modelling Analytical modelling ductility Engenharia e Tecnologia::Engenharia Civil |
| Ano: | 2016 |
| País: | Portugal |
| Tipo de documento: | tese de doutoramento |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The present thesis intended to contribute for the development of a new generation of high durable and sustainable reinforced concrete (RC) beam structures submitted to flexural loading, by combining the benefits that Glass Fiber Reinforced Polymers (GFRP) and steel bars can provide: the former due to their corrosion immunity, and the latter derived from their high ductility. Furthermore, High Performance Fiber Reinforced Concrete (HPFRC) was developed to improve the ductility of such innovative structures. To avoid corrosion, steel bar was placed with a HPFRC cover thickness, higher than 100 mm, while GFRP bars were applied in the near tensile surface of the HPFRC beams. In addition, the GFRP and steel bars were applied with a certain pre-stress level. The prestressing optimized their reinforcing capabilities, and increased the service load carrying capacity of the beam. On the other hand, conventional shear reinforcements were not used, and they were totally replaced by HPFRC material. Due to the quite high post-cracking tensile strength and energy absorption capacity that HPFRC attained, the composite system showed adequate shear resisting, and also enhancement in the structural performance at both Serviceability and Ultimate Limit States (SLS and ULS). The work started with the assessment to bond behavior between GFRP and HPFRC through experimental tests and analytical investigation. The structural performance of this hybrid prestressed GFRP-steel reinforced HPFRC was investigated by performing four-point bending tests on beams with I-shaped cross section under both monotonic and fatigue loading conditions. Moreover, an extensive analytical formulation was developed in order to theoretically address to the main structural aspect of the tested beams. The obtained experimental results were captured well using the respective results from the analytical study. Finally, finite element (FE) simulations were carried out using two well-known modelling approaches available in the literature for concrete elements in form of both 2D and 3D models. The results obtained from these models were promising, a |
|---|