Abstract:This work presents an analysis of different proposals of rehabilitation of a masonry building, built around the beginning of the XX century for public schools, in the highest seismic risk zone of Argentine; and which was closed down after Mendoza`s Earthquake in 1985. The building has masonry walls of artisanal ceramic bricks and wood-framed roof but it does not have lateral ties. Currently, it gives evidence of structural pathologies due to various seismic events and the lack of maintenance by water losses. The work was developed in two stages, one in 1999, and the other one in 2010. At each stage, the evaluation of pathologies was carried out. Studies of the soil and the characterization of materials used were also conducted. As a reference, the effect of vibrations generated by the traffic was measured. With the parameters obtained, the structure was modeled through finite elements in order to verify the status of damage and the behavior of the proposed rehabilitation (reinforced concrete or steel structure). The technique of rehabilitation accepted by the heritage experts is the reversible type, in order to avoid further damage to the existing masonry. The seismic capacity is evaluated according to the rules in force. Both proposals should be considered as determining the site conditions and soils in relation to the vulnerability of construction and structural safety. The chosen solution has not only taken into account the use but also the service life of this intervention and the lowest cost possible with local technologies.
Sustainability is concerned with the most efficient use of resources where the residues play an essential role. Trends in concrete technology include natural or artificial additions and additives in order to reduce the consumption of cement. The characterization of the wastes is of great importance with respect to the amount that must be incorporated into the matrices of construction materials both for its economic and engineering impacts (strength and durability). The authors study the impact in strength, durability, and sustainability of the use of finely ground waste of ferroalloys in concrete. The behavior of durability of sustainable concrete also is evaluated. The proportioning between traditional materials and these additions involves preliminary tests on pastes and mortars. Also, they study the impact of the use of different plastic wastes (polyethylene) in different percentages. They evaluated consistency, compressive strength, suction capability, and leaching.
En América se ha utilizado la mampostería cerámica cocida desde mediados del siglo XVIII la cual forma parte del patrimonio cultural local. La permanencia en el tiempo se debe a su técnica de construcción, calidad de materiales y mantenimiento además del efecto de los terremotos. Se presentan resultados de inspección detallada de cinco construcciones de mampostería cerámica de valor patrimonial con diferentes patologías que requieren distintas tecnologías de puesta en valor en la zona de mayor riesgo sísmico de Argentina. La metodología de estudio utilizada para las propuestas de rehabilitación incluye la modelación por elementos finitos, lo que requiere de parámetros de comportamiento de mampuestos y morteros para comprender las patologías subyacentes obtenidos de ensayos de laboratorio y monitoreo in situ. La puesta en valor debe considerar que no se presente incompatibilidad de materiales aplicando tecnologías locales.
Masonry is a composite material characterised by its good behaviour under dead loads and in a nonaggressive environment. However, this noble material does not satisfactorily resist seismic loads. The different types of historical masonry that have remained over time are characterised by an adequate mixture of materials with low chemical reactions that are degrading due to environmental conditions. There are numerous historical masonry construction techniques in the world, reflecting local conditions of materials and workmanship. The key to its permanence and maintenance over time despite the effects of earthquakes is the construction technology and quality of materials used. As a result of earthquake damage observation and experimental research, various technical solutions for rehabilitation and retrofit of masonry are now available. Finite element modelling has become a very useful tool to identify the damage problem in historical masonry but requires a significant contribution of parameters obtained from destructive and nondestructive tests.
O conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons Atribuição-Não-Comercial NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0). Direitos para esta edição cedidos à Editora Artemis pelos autores. Permitido o download da obra e o compartilhamento, desde que sejam atribuídos créditos aos autores, e sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.A responsabilidade pelo conteúdo dos artigos e seus dados, em sua forma, correção e confiabilidade é exclusiva dos autores. A Editora Artemis, em seu compromisso de manter e aperfeiçoar a qualidade e confiabilidade dos trabalhos que publica, conduz a avaliação cega pelos pares de todos manuscritos publicados, com base em critérios de neutralidade e imparcialidade acadêmica.
RESUMENLa Escuela Mitre es un edificio educacional monumental, habilitado en 1906, de mampostería cerámica cocida sin encadenar. Durante su vida útil ha sufrido daños debido a los terremotos impulsivos de Mendoza, Argentina, a los cambios en los materiales y a la falta de mantenimiento. La metodología de estudio ha incluido las siguientes etapas: una inspección detallada, las decisiones de emergencia, el análisis de las condiciones de conservación del edificio, el diagnóstico y las alternativas de rehabilitación. Con los datos de campo y de laboratorio, se ha modelado el edificio mediante elementos finitos. Las ventajas del uso del hormigón en la rehabilitación es lograr el menor costo y el mejor desempeño estructural de acuerdo con las normas de rehabilitación vigentes, pero desde el punto de vista patrimonial, se ha preferido la combinación de estructuras de acero que no interfieren con la fábrica original y la rehabilitación de fundaciones con hormigón armado.Palabras clave: patrimonio; seguridad; sismorresistente; puesta en valor.ABSTRACTThe Mitre School is a monumental building enabled in 1906 using fired ceramic masonry without tie-reinforcement. During its service life it has suffered damages from impulsive earthquakes in Mendoza, Argentina, as well as from changes in the materials and lack of maintenance. The methodology of study included the following stages: a detailed inspection, emergency decisions, analysis of conservation state of the building, as well as the diagnosis and rehabilitation alternatives. With the data from the field and laboratory tests, the building was modeled by using finite elements. The advantages of the use of concrete in the rehabilitation include the lowest cost and the best structural performance according to rehabilitation standards in force; nonetheless, from the standpoint of heritage, the combination of steel structures, that do not interfere with the original factory, and the rehabilitation of reinforced concrete foundations are preferred.Keywords: heritage; safety; seismic resistant; enhancement.
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