Comportamiento Experimental y Modelaje de un Disipador Sísmico de Bajo Daño y de Alta Dureza Aplicable a Uniones Viga - Columna de Marcos de Resistencia a Momento

dc.contributor.advisorChanchí Golondrino, José Christianspa
dc.contributor.authorDuque Sierra, José Luisspa
dc.date.accessioned2021-01-18T21:53:36Zspa
dc.date.available2021-01-18T21:53:36Zspa
dc.date.issued2020spa
dc.description.abstractEn esta tesis un disipador sísmico aplicable a uniones viga columna metálicas resistentes a momento y denominado disipador de fricción rotacional es propuesto. Un modelo simple para predecir el comportamiento histerético del disipador también es propuesto. El disipador de fricción rotacional está conformado por dos platinas fijas, tres platinas con ranuras circulares denominadas platinas ranuradas y dos discos circulares. El disipador es ensamblado colocando cada platina fija como cara exterior del disipador, el grupo de las tres platinas ranuradas entre las platinas fijas y cada disco en cada interfaz entre platinas fija y ranurada. Este arreglo de platinas es unido con un pasador central y pernos de alta resistencia. Un total de 24 disipadores fueron ensamblados con pernos de alta resistencia A325 de diámetro 16mm – 22mm, platinas fijas, platinas ranuradas y pasadores centrales de Acero A36 y con discos de Aluminio, Acero A36, Cobre, y Fleje templado. Los disipadores fueron ensayados cuasi-estáticamente entre dos y cuatro veces, sin re-tensionamiento o cambio de pernos, sin cambio de discos o platina ranuradas y con un tiempo entre ensayos de 40 minutos. Los resultados muestran que el ciclo de histéresis del disipador es aproximadamente rectangular. La fuerza definida por la meseta del ciclo de histéresis denominada fuerza de rotación del disipador es desarrollada cuando las platinas ranuradas son forzadas a rotar alrededor del pasador central y de los pernos de alta resistencia superando la fricción inducida por los pernos de alta resistencia en las interfaces entre las platinas ranuradas y los discos. La repetibilidad de la fuerza de rotación es baja para discos de dureza similar a la dureza de la las platinas ranuradas y se incrementa con el aumento de la dureza de los discos respecto a la dureza de las platinas ranuradas. Incrementos en la dureza de los discos también generaron reducciones en la fuerza de rotación. Los resultados también muestran que la fuerza de rotación se incrementa con la fuerza de ensamblaje de los pernos y se reduce entre corridas debido a la pérdida de tensión en los pernos como consecuencia de la degradación de las interfaces entre las platinas ranuradas y los discos. Esta reducción en resistencia entre corridas disminuye con el aumento de la dureza de los discos respecto a la dureza de las platinas ranuradas. El modelo propuesto muestra que los ángulos asociados a las rigideces de carga y descarga del ciclo de histéresis pueden ser asumidos de 90° logrando aproximaciones sobre los resultados experimentales del 78% - 94%. El modelo también muestra que la fuerza de rotación del disipador puede ser calculada asumiendo que el disipador se comporta como una conexión tipo embrague y usando coeficientes de fricción definidos experimentalmente para las interfaces de rotación entre las platinas ranuradas y los discos. Aproximaciones entre la fuerza de rotación promedio experimental y la calculada con el modelo propuesto de 89% – 115% fueron obtenidas. El modelo propuesto también permite estimar la fuerza máxima y mínima de rotación del disipador usando coeficientes de sub-resistencia y sobre-resistencia definidos experimentalmente y que tienen en cuenta la variación de la fuerza de ensamblaje de los pernos, la variación del coeficiente de fricción y la degradación de las interfaces de rotación entre las platinas ranuradas y los discos.spa
dc.description.abstractIn this thesis, a seismic dissipator applicable to moment-resistant metallic column beam joints and called a rotational friction dissipator is proposed. A simple model to predict the hysterical behavior of the dissipator is also proposed. The rotational friction dissipator is made up of two fixed plates, three plates with circular slotted called slotted plates and two circular discs. The dissipator is assembled by placing each fixed plate as the outer face of the dissipator, the group of the three slotted plates between the fixed plates and each disc at each interface between the fixed and slotted plates. This set of plates is attached with a center pin and high-strength bolts. A total of 24 dissipator were assembled with 16mm - 22mm diameter A325 high-strength bolts, Fixed plates, slotted plates and central pin in Steel A36 and with discs in Aluminum, Steel A36, Copper, and Bisalloy. The dissipators were tested quasi-statically between two and four times, without re-tensioning or change of bolts, without change of discs or slotted plate and with a time between tests of 40 minutes. The results show that the hysteresis cyclic of dissipator is approximately rectangular. The force defined by the plateau of the hysteresis cycle called the dissipator rotational force is developed when the slotted plates are forced to rotate around the center pin and the high-strength bolts overcoming the friction induced by the high-strength bolts at the interfaces between slotted plates and discs. The repeatability of the rotational force is low for discs of similar hardness to the hardness of the slotted plates and increases with the increase of the hardness of the discs in retation to the hardness of the slotted plates. Increases in the hardness of the discs also generated reductions in the rotational force. The results also show that the rotational force increases with the bolt assembly force and decreases between runs due to the loss of tension in the bolts as This reduction in resistance between runs decreases as the hardness of the discs increases relative to the hardness of the slotted plates. The proposed model shows that the angles associated with the loading and unloading stiffnesses of the hysteresis cycle can be assumed to be 90 °achieving approximations on the experimental results of 78% - 94%. The model also shows that the dissipator rotational force can be calculated assuming that the dissipator behaves like a clutch-type connection and using experimentally defined friction coefficients for the rotational interfaces between the slotted plates and the discs. Approximations between the experimental average rotational force and that calculated with the proposed model of 89% - 115% were obtained. The proposed model also allows estimating the maximum and minimum rotational force of the dissipator using coefficients of under-resistance and over-resistance defined experimentally and that take into account the variation of the bolt assembly force, the variation of the friction coefficient and degradation of the rotational interfaces between slotted plates and discs.eng
dc.description.additionalTesis o trabajo de investigación presentada(o) como requisito parcial para optar al título de: Magister en Ingeniería - Estructuras. -- Línea de Investigación: Disipación Sísmica.spa
dc.description.degreelevelMaestríaspa
dc.format.extent127spa
dc.format.mimetypeapplication/pdfspa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/78808
dc.language.isospaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Manizalesspa
dc.publisher.departmentDepartamento de Ingeniería Civilspa
dc.publisher.programManizales - Ingeniería y Arquitectura - Maestría en Ingeniería - Estructurasspa
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dc.rightsDerechos reservados - Universidad Nacional de Colombiaspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-SinDerivadas 4.0 Internacionalspa
dc.rights.spaAcceso abiertospa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/spa
dc.subject.proposalSeismic dissipationeng
dc.subject.proposalDisipación sísmicaspa
dc.subject.proposalPassive dissipationeng
dc.subject.proposaldisipación pasivaspa
dc.subject.proposaldisipadores de bajo dañospa
dc.subject.proposalLow damage dissipatorseng
dc.subject.proposaldisipación por fricciónspa
dc.subject.proposalFriction dissipationeng
dc.subject.proposalRotational frictioneng
dc.subject.proposalfricción rotacionalspa
dc.subject.proposalSliding forceeng
dc.subject.proposalfuerza de deslizamientospa
dc.subject.proposalrelación de durezaspa
dc.subject.proposalHardness ratioeng
dc.subject.proposalRotational friction dissipatoreng
dc.subject.proposaldisipador de fricción rotacionalspa
dc.subject.proposaldiseño de estructurasspa
dc.subject.proposalStructural designeng
dc.titleComportamiento Experimental y Modelaje de un Disipador Sísmico de Bajo Daño y de Alta Dureza Aplicable a Uniones Viga - Columna de Marcos de Resistencia a Momentospa
dc.title.alternativeExperimental Behavior and Modeling of a Low Damage and High Hardness Seismic Dissipator Applicable to Beam-Column Joints of Moment Resistance Framesspa
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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