Ingeniería Civil y Mecánica

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Subject: search.filters.subject.AISLADORES SÍSMICOS

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    Análisis y diseño de un edificio con aisladores sísmicos utilizando el programa ETABS
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2022-07) Chimbo Chacha, Washington Joel; Ramírez Cabrera, Wladimir José
    For the development of this project, the difference in the dynamic behavior of fixed and isolated structures was identified. the difference in dynamic behavior of structures with: fixed base and with isolation, for this purpose, the objective was to analyze and compare the seismic behavior between them. This research was evaluated on the design of base isolators, observing the behavior of the following parameters: drifts, mass participation, vibration period, accelerations and shear. Through the pre-design, we proceeded with the modeling of the two buildings by using appropriate software for the analysis, performing the linear modal spectral analysis for the fixed base building by using the NEC - 15 design spectrum; for the system with isolation, the nonlinear time-history analysis was performed, considering the maximum probable earthquake, for which appropriate accelerograms were used and adjusted according to the area and type of soil. It is concluded that the implementation of seismic isolators to a fixed base structure, provides a better structural behavior during an earthquake due to the damping provided by these devices, obtaining much smaller relative displacements of floors, therefore, the structure with base isolators can remain operative and with minimum or null damages in comparison to a structure with a structural system of fixed base frames.
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    Análisis estático no lineal (Push Over) de los talleres de la Facultad de Ingeniería Civil y Mecánica y de la Facultad de Ingeniería en Sistemas Electrónica e Industrial, con aisladores sísmicos, ubicadas en el campus Huachi de la Universidad Técnica de Ambato
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas, 2022) López Sánchez, Byron Leonardo; Ureña Aguirre, Maritza Elizabeth
    This research work presents a comparative analysis of the structural behavior of a conventional structure and another with the implementation of seismic isolators, which are devices that allow the building to deform elastically and dissipate energy during the occurrence of earthquakes of considerable magnitude. The structures analyzed were the workshops of the faculties of: Civil and Mechanical Engineering and Systems, Electronics and Industrial Engineering and they are classified as special according to the Ecuadorian Construction Standard (NEC 2015), and present a structural system of special earthquake resistant gantries made of hot rolled steel with stiffening diagonals, they are also used as laboratories for the production area and as a higher education center.xxiii As a first study, a linear analysis of the structures was performed to verify their current state by analyzing their vibration period, displacements and permissible drifts, then a non-linear static analysis was performed to determine their seismic performance, and then the isolation system was pre-dimensioned. It was designed taking as a priority the ASCE/SEI 7-10 standard, the dead loads of the building plus 30 percent of the live load above the isolation system and based on the information provided by the manufacturer. It should be taken into account that there are a large number of options of anti-seismic devices to improve the performance and behavior of a structure; in this case study, the lead core elastomeric isolator (LRB) was chosen. Subsequently, all the established limits such as drifts, shear and displacements were verified, taking into account the provisions of the Ecuadorian Construction Standard. For the workshop of the Faculty of Civil and Mechanical Engineering with isolated base, the floor drifts were reduced by 64 percent compared to the structure without isolation, for the basal shear and horizontal displacements a reduction of 73 and 51 percent respectively, likewise for the workshop of the Faculty of Systems, Electronics and Industrial Engineering the floor drifts, shear and displacement were reduced by 69, 74 and 63 percent respectively.