Publicação
Compatible strengthening of masonry structures based on the TRM technique
| Resumo: | Several masonry structures are constructed around the world, many of them centuries old. There is a great concern in preserving and rehabilitating these structures, always maintaining their historical, cultural and social value. Many of the retrofitting methods used nowadays do not respect these values. Currently, is common to use composites, such as FRPs, to strength and rehabilitate masonry structures. These composites are composed by a matrix and fibers, being the matrices usually epoxy and the fibers commonly of carbon, glass and basalt. Although solutions using FRPs are very efficient for concrete, for masonry constructions, the behavior is not the same. The epoxy matrices are not compatible with the masonry substrate and the fibers normally used are too stiff. This problem can be solved using the Textile Reinforced Mortar (TRM) reinforcement system. This system replaces the epoxy matrix by an inorganic matrix, which is more physically and chemically compatible with masonry. Being this technique relatively new, it is necessary to make the experimental characterization of this method to understand its behavior under different circumstances. In this dissertation, the characterization of this reinforcement technique is made through experimental tests of bond, traction and shear. There are also performed tests under cyclic loading which provide further knowledge on the subject, helping understand better the behavior of the system und seismic activity. The matrix used is a commercialized hydraulic lime mortar and the fibers are of glass and steel. This work will generate new knowledge mainly on the fiber/matrix and reinforcement/substrate interface behavior in the TRM reinforcement system, necessary for the calibration of numerical models and for the future exploration and application of this reinforcement system on structural components. This work will also provide knowledge on the different tests setups and their advantages and disadvantages. |
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| Autores principais: | Freitas, Ana Raquel Cardoso de |
| Assunto: | Textile reinforced mortar Masonry reinforcement Experimental characterization Composite materials Cyclic loadings Textile reinforced mortar Reforço de alvenarias Caracterização experimental Materiais compósitos Carregamentos cíclicos |
| Ano: | 2016 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Several masonry structures are constructed around the world, many of them centuries old. There is a great concern in preserving and rehabilitating these structures, always maintaining their historical, cultural and social value. Many of the retrofitting methods used nowadays do not respect these values. Currently, is common to use composites, such as FRPs, to strength and rehabilitate masonry structures. These composites are composed by a matrix and fibers, being the matrices usually epoxy and the fibers commonly of carbon, glass and basalt. Although solutions using FRPs are very efficient for concrete, for masonry constructions, the behavior is not the same. The epoxy matrices are not compatible with the masonry substrate and the fibers normally used are too stiff. This problem can be solved using the Textile Reinforced Mortar (TRM) reinforcement system. This system replaces the epoxy matrix by an inorganic matrix, which is more physically and chemically compatible with masonry. Being this technique relatively new, it is necessary to make the experimental characterization of this method to understand its behavior under different circumstances. In this dissertation, the characterization of this reinforcement technique is made through experimental tests of bond, traction and shear. There are also performed tests under cyclic loading which provide further knowledge on the subject, helping understand better the behavior of the system und seismic activity. The matrix used is a commercialized hydraulic lime mortar and the fibers are of glass and steel. This work will generate new knowledge mainly on the fiber/matrix and reinforcement/substrate interface behavior in the TRM reinforcement system, necessary for the calibration of numerical models and for the future exploration and application of this reinforcement system on structural components. This work will also provide knowledge on the different tests setups and their advantages and disadvantages. |
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