h i g h l i g h t s 10 VPHC columns with steel reinforcements were tested to study bar buckling.2 VPHC and 2 HPC columns with Ni-Ti reinforcements were tested to study bar buckling.Columns with both Ni-Ti and steel reinforcements were compared.
Compressed reinforcement buckling in concrete columns can reduce ductility in structural elements. In order to avoid this, design codes propose maximum required tie spacing. Nonetheless, they do not incorporate the positive effect of concrete fibers in their formulation, whose capability of delaying buckling has been proved. For this reason, recommendations for maximum required tie spacing for elements made with concrete, with or without steel fibers, and with normal or high strength, are proposed in this article. In order to achieve this, the mixed model proposed by Pereiro-Barceló and Bonet was extended to consider elements made of HSC with and without steel fibers thanks to the results of an experimental campaign of HSC columns with and without fibers, under monotonic loading. In these tests, the buckling critical load in compressed reinforcement was experimentally determined in all the columns. In addition, a comparison of the proposed transverse concrete separation with respect to the recommendations proposed by the main existing codes was made.
El presente trabajo muestra una parte del complejo tratamiento de restauración llevado a cabo en el ilustre Panteón de la familia Pau (1895), situado en el Cementerio General de Valencia. El panteón está atribuido al arquitecto Gerardo Roig i Gimeno y posee unas medidas de 3,90 x 7,85 x 4,2 m. Concretamente, la figura escultórica del ángel alado objeto de esta intervención está tallada en mármol estatuario de Carrara y, del conjunto de daños identificados, la presencia de grietas en la parte trasera representaba el deterioro más destacado, el cual comprometía su estética y estabilidad estructural. Con el fin de dar solución a los daños, se aplicaron una serie de estrategias centradas en, a) desmontaje de las alas; b) limpieza fisicoquímica; c) consolidación; d) tratamiento del volumen, cosidos, sellados, desarrollo de espigas híbridas piedra-fibra de vidrio y montaje de las alas; e) protección; y, f) plan de mantenimiento. El trabajo presentado pone de relieve la operación desarrollada, con un enfoque mínimamente invasivo, lo que permitió recuperar la estabilidad estructural ante el inminente estado de colapso en el que se hallaba la pieza.
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