Browsing by Author "Fuentealba Bizama, Francisco Javier"

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    Evaluación del desempeño sísmico de edificio de flotación neumática según NCh2369 2023.
    (Universidad de Concepción, 2024) Fuentealba Bizama, Francisco Javier; Silva Muñoz, Rodrigo Antonio
    Earthquakes are part of the country's collective identity, but unlike other natural disasters in Chile, there is a very high seismic culture in society. The way potential damages are addressed is through the application of seismic-resistant standards, with NCh 2369 "Seismic Design of Industrial Structures and Installations" being the norm that sets the minimum standards for the design of industrial structures. The first edition was in 2003, but technological advances, discoveries, and seismic experiences since its implementation make it possible to update it, following the same design philosophy that has prevailed even before its creation, namely a design based on over-resistance and aiming to use ductility as little as possible. Initially, a linear design of the structure is carried out, reflecting the new provisions of the norm, such as the incorporation of an amplification factor for reduced seismic loads for non-fusible elements, a new spectral shape, and changes in compactness limits. The changes incorporated in the new norm will be reflected in increases in masses in certain profiles, such as seismic columns, now designed with amplified seismicity. However, the main objective of this work is to evaluate the seismic performance of the structure, in this case, a Pneumatic Flotation Building, based on a mixed system of braced frames at the first level and rigid frames from the second level. The performance will be evaluated according to the norm and will be carried out through a nonlinear time-history analysis, where the nonlinearity of bolts, bracings, and beams will be considered using plastic hinges. Two levels of seismic demand will be considered: design level (SDI) and maximum possible seismic level (SMP). The seismic performance showed an over-resistance slightly below that projected by the linear design. This is because both the columns and the bracings were designed as much as possible with high utilization factors, and the bolts of the main anchors are also designed to the limit, so this situation was expected. The use of ductility by the structure proved to be low, an expected result considering its structure, i.e., seismic columns designed to remain in the elastic range and the existence of bracings that help dissipate energy only at the first level of the building.
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