Masonry structures shear failure is generally preceded by a massive cracking development in the mortar joints. For this reason, the mortar joints limit the final strength. Mechanical properties degradation and structural safety loss make the rehabilitation or reinforcement necessary. The reinforcement technique with fiber reinforcement polymers has experimentally proved to be very effective. However, in the present, analytical and numerical capacity to quantify this retrofitting system efficiency is still subject of research. In order to improve these intervention techniques it is necessary to have more experimental data and a numerical tool to simulate their behavior. Although the in-plane mechanical behaviour of unreinforced masonry and masonry retrofitted with fiber reinforced polymer (FRP) laminates has been studied by several authors, the analytical modelling of mechanical behaviour of masonry remains an open problem, due to its natural variability and inhomogeneity. A coupled damaged-plasticity model in which bricks and mortar are separately modelled (micro approach) is considered to carried out a parametric study of in plane shear behavior of unreinforced and FRP retrofitted scaled masonry walls. Composite materials are simulated as an elastic orthotropic material. Parametric study results are compared with experimental data obtained from unreinforced and FRP reinforced panels subjected to shear loads.
En las últimas décadas, se ha extendido el uso de un solo tipo de fibras, ya sean de acero o sintéticas, como refuerzo del hormigón en tubos premoldeados. Sin embargo, el hormigón tiene comportamiento a la fractura en múltiples escalas y un tipo de fibra proporciona refuerzo solo en un nivel y dentro de un rango limitado de deformaciones. Por ello, un refuerzo más eficiente podría lograrse utilizando la combinación de fibras de diferentes materiales, geometría y/o características mecánicas. El hormigón reforzado con dos o más tipos de fibras, combinadas racionalmente, se denomina Hormigón Reforzado con Fibras Híbridas (HRFH). En este trabajo, se presentan los resultados de una campaña experimental en la que se estudió la capacidad de carga de tubos de HRFH (THRFH), sometidos al ensayo de compresión diametral de tres aristas. Los resultados se comparan con los obtenidos para tubos de hormigón con refuerzo tradicional de barras de acero (THA) y tubos de hormigón reforzado con fibras de acero (THRFA), elaborados y ensayados en la misma campaña. Los resultados mostraron que los THRFH alcanzaron una capacidad de carga equivalente a los THA y superior a la de los THRFA.
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