Time evolution of the modal parameters of a five-story building using strong motion data

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Resumen

This paper presents the identification of the time-variant modal properties of a full-scale fivestory RC building tested on a shake table. The building was tested under fixed-base (FB) and base-isolated (BI) configurations and was subjected to a suite of earthquake motions of various intensities. The deterministic-stochastic subspace identification method is employed to estimate the variations of the modal properties of the BI building during the seismic tests by employing a short-time windowing approach. The changes of the modal parameters are tracked, analyzed, and compared to those previously identified from ambient vibrations data and low-amplitude whitenoise base excitation tests. In addition, observed and measured responses of the structure are studied and correlated with the variation of the identified modal parameters. For the base-isolated configuration, the nonlinear behavior of the isolators generates the variation of the identified natural frequencies and equivalent damping ratios of the building, which change in agreement with the input motion intensity. A high correlation between the effective stiffness of the isolators and the instantaneous frequency of the first mode is found. The effective damping ratio of the isolation system and the instantaneous damping ratio of the fundamental mode of the building are highly correlated.

Idioma originalInglés
Título de la publicación alojada11th National Conference on Earthquake Engineering 2018, NCEE 2018
Subtítulo de la publicación alojadaIntegrating Science, Engineering, and Policy
EditorialEarthquake Engineering Research Institute
Páginas6155-6164
Número de páginas10
ISBN (versión digital)9781510873254
EstadoPublicada - 2018
Evento11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018 - Los Angeles, Estados Unidos
Duración: 25 jun 201829 jun 2018

Serie de la publicación

Nombre11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy
Volumen10

Conferencia

Conferencia11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018
País/TerritorioEstados Unidos
CiudadLos Angeles
Período25/06/1829/06/18

Nota bibliográfica

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Copyright © 2018 Earthquake Engineering Research Institute. All rights reserved.

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