Publicação
Development of innovative hybrid DHCC-GFRP sandwich panels
| Resumo: | In this study, a new generation of composite sandwich slab is proposed as a solution for the rehabilitation of slabs in old masonry buildings. The innovative solution proposed includes four components: a Deflection Hardening Cement Composite (DHCC) layer on the top compression skin, a glass fiber reinforced polymer (GFRP) skin at the bottom tension surface, GFRP ribs to transfer shear from top to bottom layers, and foam core for thermal-insulation purposes. The DHCC layer contributes to the load carrying and deflection capacity due to its high stiffness, compressive strength and toughness. It also offers resistance to the occurrence of buckling phenomena in the GFRP ribs, improves the performance of this structural concept against impact and fire, and constitutes an excellent medium for the application of finishing materials, like ceramics or timber. To evaluate the efficiency of the developed innovative slabs, different composite specimens, with various span lengths, were tested under different load conditions, including flexural loading, shear loading, and long term deformation. The obtained results from experimental tests are comprehensively analysed. Advanced numerical simulations on the hybrid slabs are also developed. The influence of considering isotropic or orthotropic behaviour for the GFRP components and linear or nonlinear behaviour for the DHCC is investigated numerically. The results obtained during the experimental tests are used to appraise the performance of the constitutive models adopted in the FEM-based simulations and the quality of the meshes defined. In addition, some analytical models that consider the relation between force and deflection are proposed to evaluate the response of this structural system under static and long-term loadings. |
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| Autores principais: | Mastali, Mohammad |
| Assunto: | 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: | In this study, a new generation of composite sandwich slab is proposed as a solution for the rehabilitation of slabs in old masonry buildings. The innovative solution proposed includes four components: a Deflection Hardening Cement Composite (DHCC) layer on the top compression skin, a glass fiber reinforced polymer (GFRP) skin at the bottom tension surface, GFRP ribs to transfer shear from top to bottom layers, and foam core for thermal-insulation purposes. The DHCC layer contributes to the load carrying and deflection capacity due to its high stiffness, compressive strength and toughness. It also offers resistance to the occurrence of buckling phenomena in the GFRP ribs, improves the performance of this structural concept against impact and fire, and constitutes an excellent medium for the application of finishing materials, like ceramics or timber. To evaluate the efficiency of the developed innovative slabs, different composite specimens, with various span lengths, were tested under different load conditions, including flexural loading, shear loading, and long term deformation. The obtained results from experimental tests are comprehensively analysed. Advanced numerical simulations on the hybrid slabs are also developed. The influence of considering isotropic or orthotropic behaviour for the GFRP components and linear or nonlinear behaviour for the DHCC is investigated numerically. The results obtained during the experimental tests are used to appraise the performance of the constitutive models adopted in the FEM-based simulations and the quality of the meshes defined. In addition, some analytical models that consider the relation between force and deflection are proposed to evaluate the response of this structural system under static and long-term loadings. |
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