Unidad de Posgrado Civil y Mecánica

URI permanente para esta comunidadhttp://repositorio.uta.edu.ec/handle/123456789/901

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2013 - 201912020 - 20221

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  • Miniatura
    Item type:Ítem,
    Incidencia y eficiencia del uso de conexiones no precalificadas, ni ensayadas experimentalmente, en el desempeño de estructuras metálicas en el Ecuador; tipos y pseudo - criterios
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas, 2022-09)
    Toapanta Molina, Álvaro Santiago
    ;
    López Villacís, Gonzalo Eduardo
    Structural engineering has undergone major changes as a result of the need to innovate and create new building methods, likewise, changing from conventional materials to materials with better structural behavior in the face of seismic events as a starting point, which several professionals prioritize in their designs. So, currently Home Boulding, buildings, bridges and others are built with structural steel elements, a material that has been very popular in the industry in recent years. However, several of the systems used lack design criteria or do not obey the demands for load request and seismic effects, which are established in international and national standards (AISC, FEMA and NEC). This research work analyzes the use of A36 steel in Beam-column Connection for buildings, made of tubular sections, with dimensions taken from a real structural system (SMF). The type of connection is also evaluated, using for this a welding cord with E6011 electrodes, which does not meet design criteria for qualified connections, since the filler material and type of welding are not those recommended by the reference standards in this research. Connections that are very often used in steel structures in our environment. The connection proposed in this work is then prioritized to determine if it meets the requirements of the AISC 341-16 and AISC 358-16 standard, for prequalified connections, by analyzing the behavior of 5 full-scale connection prototypes subjected to load cycles. By controlling the drift angle produced between the beam and the column, as recommended by FEMA 350 for loading protocols. One of the prototypes or specimens is used to determine the ultimate strength before connection failure occurs, what is known as a monotonic laterally loaded testing. The hysteresis curves of the prototypes tested relative to the moment vs the angle of drift or rotation (0.04 rad) defined in the loading protocol should be at least 80% of the probable moment, calculated according to the mechanical properties of the material of the elements. With the data obtained experimentally and verifying compliance with the prequalification parameters of the beam-column connection, the comparative analysis of results is carried out, with a mathematical model that uses finite elements for its development (ANSYS), likewise the unitary deformations reached are shown., by means of the software mentioned and the data thrown by the strain gauges, located near the welding cord in the connection. Conclusions, this type of connections in Ecuador have not been tested and are not prequalified either, leaving a precedent on their efficiency and impact on construction, for those professionals who use them.
  • Miniatura
    Item type:Ítem,
    Estudio del comportamiento mecánico de una sección de la superestructura del autobús interprovincial marca Miral Infiniti en chasis Hino Ak sometida a volcadura, mediante los programas Ansys Ls-Dyna y su incidencia en el espacio de supervivencia
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Diseño Mecánico, 2013)
    Arroba Arroba, César Hernán
    ;
    Córdova Suárez, Manolo Alexander
    La investigación de basa en la simulación del ensayo de vuelco en una sección de la superestructura del Autobús de servicio interprovincial fabricado por Miral Autobuses mediante los software, Ansys y Ls-Dyna para determinar si la configuración de la superestructura garantiza que el espacio de supervivencia determinado por el Reglamento CEPE/ONU 66 no es invadido al finalizar el ensayo. Para realizar el ensayo de vuelco primero se caracterizó el material que utiliza Miral Autobuses en la fabricación de la superestructura del autobús determinando propiedades mecánicas que son necesarios para el software Ls-Dyna. Se realiza una validación de resultados emitidos por Ls-Dyna simulando los ensayos de tracción, flexión, y flexión de una sección del pórtico y comparando con los resultados de ensayos físicos realizados en la maquina universal. Se efectúa la simulación de la sección de la superestructura del autobús para determinar si el espacio de supervivencia es invadido, encontrando oportunidades de mejora, realizando un rediseño de la superestructura que cumpla con la normativa NTE INEN 1323 y Reglamento_n°_66_(CEPE/ONU).