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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    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.