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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“Aplicación de disipadores de energía tipo ADAS/TADAS a una configuración estructural, ubicada en la ciudad de Pujilí, por el método del espectro capacidad”.
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas., 2025) Claudio Benites José Luis; Cañizares Ortega Freddy Fernando
"APPLICATION OF ADAS/TADAS-TYPE ENERGY DISSIPATORS TO A STRUCTURAL CONFIGURATION LOCATED IN THE CITY OF PUJILÍ USING THE CAPACITY SPECTRUM METHOD." MODALIDAD DE TITULACIÓN: Degree project with applied research and/or development components. AUTHOR: Ing. José Luis Claudio Benites DIRECTOR: Ing. Freddy Fernando Cañizares Ortega, Mg. DATE: 18 de marzo del 2025. EXECUTIVE SUMMARY The growing concern for the safety and stability of structures under dynamic loads, such as earthquakes and wind, has driven the search for innovative solutions in structural engineering. In this context, ADAS/TADAS-type energy dissipators have emerged as an effective technology to mitigate vibrations and oscillations in buildings, bridges, and other infrastructures. These devices absorb and dissipate the kinetic energy generated by external forces, reducing the impact of seismic events and enhancing structural resilience. Their implementation not only increases the safety of structures but also contributes to lowering maintenance and repair costs by minimizing structural damage. Additionally, their design allows for greater comfort for occupants, especially in high-rise buildings where wind effects can cause discomfort. To evaluate the effectiveness of ADAS/TADAS dissipators, an analysis was conducted based on customized structural design criteria, considering variables such as geographic location, expected dynamic loads, and specific characteristics of each project. Numerical studies and computer simulations were carried out to assess their performance under various loading conditions. Furthermore, structures with and xv without dissipators were compared, showing significant differences in terms of displacement reduction and induced stress mitigation. The most commonly evaluated applications included skyscrapers, where these devices enhance stability against wind and seismic forces; bridges, where they help control vibration and extend service life; and industrial structures, where they protect sensitive equipment from excessive oscillations. The results showed a significant reduction in vibrations and oscillations, improving structural stability and occupant safety. However, future research may focus on optimizing materials and configurations to maximize efficiency and economic feasibility.
Diseño y análisis del comportamiento estructural de un edificio en la ciudad de Ambato mediante el uso de disipadores sísmicos.
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas., 2025) López Sánchez José Luis; Cañizares Ortega Freddy Fernando
This research project presents a comparative analysis of the seismic performance of a special building located in Ambato, utilizing Special Moment Frames (SMF) and Buckling-Restrained Braces (BRB). The main objective of the study is to evaluate the structural performance in terms of strength, capacity, stiffness, and nonlinear behavior under seismic loading. The proposed design for the steel structure incorporates BRB frames, aimed at minimizing deformations induced by seismic events. These systems utilize braces with ductile cores and replaceable assemblies, which enable efficient energy dissipation. The applied methodology is based on international standards such as AISC 360, AISC 341, NEC 15, and ASCE 41-17, covering literature review, soil analysis, load estimation, nonlinear time history analysis, and unit cost comparison. The results show that BRB systems offer superior seismic performance compared to moment-resisting frames, without involving a significant increase in implementation costs. However, it is important to note that the findings of this research are specific to the soil and loading conditions of the analyzed structure; therefore, further studies are recommended for other types of buildings and geotechnical contexts.
Estudio de la influencia de las funciones de impedancia en la interacción suelo-estructura para edificaciones de acero en suelos intermedios de la ciudad de Ambato - Ecuador
(2025) Cañizares Proaño Juan Javier; Cañizares Ortega Freddy Fernando
Conventional building design is commonly carried out under the assumption that the structure is fixed at its base and the foundation is rigid. However, soil-structure interaction (SSI) can significantly influence the seismic performance of buildings and, consequently, their design. The objective of this research was to evaluate the extent to which SSI affects interstory drifts through the implementation of impedance functions. This analysis depends on various factors such as building height, foundation depth, effective average shear wave velocity (Vs), and the fundamental vibration period of the structure. It is well understood that a structure founded on an intermediate soil (with Vs less than 360 m/s) responds differently under dynamic seismic excitation compared to one on an infinitely rigid base. Therefore, it becomes necessary to analyze such structures considering flexible foundations by implementing soil springs and damping effects In the development of this study, the influence of SSI on interstory drifts was assessed using parameters provided by FEMA P-2091, ASCE 7-16, the seismic microzonation of Ambato, an in-situ geotechnical investigation, a soft soil stratum as a reference example, and a mathematical model. The results showed that, for this particular case, there was no significant difference in interstory drifts between Model 1 (structure with a fixed-base assumption) and Model 2 (structure with a flexible-base on the actual site). However, a notable difference was observed in the model incorporating a soft soil layer with a flexible base, which exhibited changes in both the vibration period and interstory drifts of the structure. It was concluded that, in this case, SSI did not play a significant role for the structure built over soil with Vs greater than 360 m/s. Thus, designing based on a fully fixedbase assumption is a practical, efficient, and economical approach, especially considering that site-specific parameters are also included when determining the seismic loading on the structure. Conversely, for soil strata with Vs values between 180 and 360 m/s, the study showed that such assumptions lead to underestimations inxvii interstory drifts, seismic demands, and structural periods. Therefore, it is recommended that structural engineering efforts incorporate seismic refraction studies across various zones of the city to enhance design efficiency, particularly in areas with artificial fill or soils susceptible to liquefaction.
Evaluación estructural de un puente en el sector Yaguana del cantón Quijos.
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas., 2025) Yambay Guano Dolores; Cañizares Ortega Freddy Fernando
The present study focused on the analysis and structural reinforcement of the bridge over the Yahuana River, which presented critical problems due to deformations, cracks and corrosion in its structure. The initial inspection revealed that the most affected girder suffered a complete torsion due to soil saturation after heavy rains, which caused deformations in the bracing and diagonals. In addition, cracks were observed in the bridge slab, causing corrosion in the reinforcement due to water infiltration. These problems were aggravated by the reduction of the minimum clearance of the bridge, compromising its safety and functionality. Analysis of both dead and live loads identified that the main girders had critical web slenderness, which made them susceptible to buckling under high loads. The maximum bending and torsional moments, as well as the vertical displacements, exceeded the regulatory limits established by AASHTO, which highlighted the need for structural strengthening. After the implementation of the strengthening, a significant improvement in the structural response of the bridge was observed. Vertical displacements were reduced by 71.16%, bending moments by 66.31% and torsional moments by 69.48%. These results confirmed that the proposed strengthening was effective in improving the stability and strength of the bridge, complying with the limits established by the AASHTO standards. The study demonstrated that the reinforcement by means of reinforcing plates in the web of type I girders is a viable solution to correct structural deficiencies in bridges with slenderness and buckling problems. In addition, it highlights the importance of performing detailed inspections and structural analysis to ensure the safety and functionality of critical infrastructure. Finally, it is recommended to implement a regular monitoring and maintenance program, as well as to improve the drainage system around the bridge to prevent future problems related to water infiltration and ground instability.