Maestría en Ingeniería Civil con Mención en Estructuras Metálicas

Permanent URI for this collectionhttp://repositorio.uta.edu.ec/handle/123456789/34193

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Comparación de diseños de vigas de alma abierta con conectores de corte de perfil angular y de varilla corrugada para determinar su grado de eficiencia
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas., 2025) Oña Cifuentes Cristian Jair; Cevallos Cabrera Jorge Washington
The purpose of this article is to compare the strength and deflections at the yield limit and maximum capacity provided by the composite system of an open-web beam with a solid slab and shear connectors using corrugated rebar and angles. The specimens were fabricated using materials from Ambato y Quito, Ecuador, including ASTM A36 steel, ASTM A615 steel, and concrete with a compressive strength of f'c = 210 kg/cm². These comparisons were based on the results obtained from a four-point bending test conducted on two six-meter-long specimens with corrugated rebar connectors and two with angle connectors. This research analyzed the efficiency of the specimens in dissipating energy in the elastic and plastic regions, their ductility, stiffness, structural behavior regarding deformations, and failure modes during the interactive load versus deflection process. The average capacity for each type of connector was determined, and comparative calculations were performed, revealing a 16% variation in the yield limit and a 6% variation in the plastic limit, concluding that the two systems differ in structural strength. The results also validate the accuracy of the calculation methodologies for the beam’s nominal moment resistance and the precision of the formulations adapted for shear connectors using rebar and angles, given that AISC and SJI do not provide a specific method for this type of connection.
Estudio comparativo de la deflexión de una viga de alma abierta con diferentes cuantías de acero
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas., 2025) Martínez Ortiz Alfredo; Cevallos Cabrera Jorge Washington
This study focuses on the analysis of the behavior of Joist-type open web beams with different amounts of steel, evaluating their stiffness and deflection under distributed loads. The beams, fabricated in ASTM A36 structural steel, were subjected to experimental tests and computational simulations to determine how the variation in the amount of steel influences their structural performance. The results showed that a higher amount of steel significantly reduces the deflection and increases the stiffness of the beams, which is consistent with structural design theory. The research also revealed significant variability in deflection under high loads, attributed to factors such as imperfections in fabrication, differences in material properties, and the configuration of diagonal and chord elements. These findings have important implications for the design of steel structures, suggesting that, in applications with high loads, it is advisable to use beams with a greater amount of steel to ensure lower deflection and greater safety. The study highlights the importance of more detailed analysis and testing to reduce variability and optimize the design of open web beams. The results provide a sol id basis for future research, which could include the analysis of other factors such as beam geometry, load distribution and behavior under dynamic loads, with the aim of improving the efficiency and safety of these structures in practica! applications.