Ingeniería Civil y Mecánica

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    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.
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    Análisis del comportamiento del rotor en operación de un aerogenerador de baja potencia ubicado en el sector de Río Blanco comunidad Yatzaputzán para determinar su eficiencia
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2018) Romero Rosero, Jesús Emanuel; Mayorga Pardo, Alex Santiago
    The present experimental work consists of obtaining the characteristic curve of a low power wind turbine located in the sector of Río Blanco community Yatzaputzán, province of Tungurahua - Ecuador to determine its efficiency, for which the following variables have been sampled: of wind, rotation speed of the rotor, pressure, temperature, voltage and amperage delivered by the generator to the electric network, as well as the power factor Cp and the annual energy production of the machine were obtained. The analysis was carried out based on the regulations and bibliography on the test of the power curve for small wind turbines. Sampling was done through a data acquisition system that saves the sampled data in a database of its own in real time to tabulate them using the bine method and statistically obtain values; maximum, minimum, standard deviation and average for each bin of wind speed to then plot the power curve, power factor curve, torque coefficient curve and global power coefficient. Optimal time intervals were taken for the measurements with which the behavior of the rotor in operation can be analyzed in a better way, which will enable us to make the necessary changes in the future to increase its performance and improve its efficiency.