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Earthquakes and Structures
  Volume 7, Number 6, December 2014, pages 1241-1258

Response of structures to seismic sequences corresponding to Mexican soft soils
Gerardo Díaz-Martínez, Jorge Ruiz-García and Amador Terán-Gilmore

    This is paper presents the results of an analytical study aimed at evaluating the effect of narrow-banded mainshock/aftershock seismic sequences on the response of structures built on very soft soil sites. Due to the scarce availability of recorded seismic sequences in accelerographic stations located in the lake-bed of Mexico City, artificial narrow-banded sequences were employed. In the first part of this study, a parametric investigation was carried out to identify the mainshock/aftershock ground motion features that have detrimental effects in the seismic performance of equivalent single-degree-of-freedom systems representative of framed-buildings that house standard and essential facilities. In the second part of this work, the seismic response of two (8- and 18-story) steel-moment resisting frames that house essential facilities is examined. It is concluded that buildings with fundamental periods of vibration longer than the dominant period of the mainshock can experience a significant increment in their inter-story drift demands due to the occurrence of an aftershock.
Key Words
    seismic sequences; displacement-based design; soft soils; performance-based design
Gerardo Díaz-Martínez and Amador Terán-GilmoreDepto. de Materiales, Universidad Autónoma Metropolitana-Azcapotzalco, 02200 México D.F., México

Jorge Ruiz-García: Facultad de Ingeniería Civil, Universidad Michoacana de San Nicolás de Hidalgo, Edificio C, Planta Baja,
Cd. Universitaria, 58040 Morelia, México

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