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Título del libro: Earthquake Geotechnical Engineering For Protection And Development Of Environment And Constructions- Proceedings Of The 7th International Conference On Earthquake Geotechnical Engineering, 2019
Título del capítulo: Seismic performance evaluation of a bridge crossed by a normal fault

Autores UNAM:
JUAN MANUEL MAYORAL VILLA; MIGUEL PEDRO ROMO ORGANISTA;

Autores externos:

Idioma:
Inglés

Año de publicación:
2019

Palabras clave:

Earthquakes; Fault slips; Seismic waves; Soil structure interactions; Finite difference model; Massive concrete walls; Potential faults; Seismic performance evaluation; Spectral acceleration; Spectral matchings; Synthetic ground motions; Uniform hazard spectrums; Geotechnical engineering

Resumen:

A seismic performance evaluation of the supports of a 300 m long bridge, which is crossed by a normal active fault, was conducted to establish a technically sound foundation alternative capable of attenuating the seismic demand acting on the structure. Sets of three-dimensional finite difference models were developed to assess both the free field response, considering topographic and site effects, as well as the seismic soil-structure interaction along the bridge, accounting for the presence of the fault. The seismic environment was characterized through a uniform hazard spectrum, UHS. Synthetic ground motions were developed for the numerical study using a time-domain spectral matching. The numerical models considered both conventional, and casing-like foundations. This casing foundation is comprised of massive concrete walls that enclose the soil. From the results gathered in this study, it was concluded that the casing foundation significantly reduces the spectral accelerations at the supports, and improves their foundation capacity to withstand differential settlements due to a potential fault offset. © 2019 Associazione Geotecnica Italiana, Rome, Italy.

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