Browsing by Author "Uribe Opazo, Rodrigo Vicente"

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    Diseño, fabricación y exploración de dispositivo disipador de energía para estructuras en base a fricción en arena.
    (Universidad de Concepción, 2023) Uribe Opazo, Rodrigo Vicente; Silva Muñoz, Rodrigo Antonio; Vásquez Stuardo, Felipe Andrés
    Due to the permanent increase of high-rise constructions in the country, and the evident seismic risk associated, it is necessary to study, experiment and apply different types of energy dissipation devices, which allow a sustainable development added to a perception of safety of the users in the buildings. The development of this report is based on the study of an innovative and sustainable energy dissipation device for structures, using common materials in engineering. A removable dissipator is designed and manufactured, inspired by a prototype devised by Makris et al (2021), made of a steel mantle with sand inside, which is crossed by a rod with a sphere in the middle. The energy dissipation mechanism is activated by the relative displacement of the rod, where friction is generated as the sand flows over the steel sphere. In addition, it is possible to monitor and adjust the confining pressure inside, with strain gauges incorporated in post-tensioned steel wires. From tests on the Instron 8801 machine, located at the Universidad de Concepción, the behavior of the dissipator is analyzed through hysteretic cycles with different displacement amplitudes, confining pressures and velocities. Additionally, the performance of the device is explored with changes in the piston design. Stable hysteretic cycles similar to those found in the literature are obtained, with the difference of the asymmetry in the maximum forces due to the nature of the test. Despite the decrease in pressure due to sand settlement, the dissipator manages to increase the capacity by increasing the confining pressure. In addition, there are no failures in the seals, nor in the other parts of the system, which are reusable. With this it is possible to initiate a study with the purpose of designing a dissipator that optimizes the dimensions and minimizes the loss of pressure in the system.
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