Predominant period and equivalent viscous damping ratio identification for a full-scale building shake table test

Michelle C. Chen*, Rodrigo Astroza, José I. Restrepo, Joel P. Conte, Tara Hutchinson, Yehuda Bock

*Autor correspondiente de este trabajo

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

12 Citas (Scopus)

Resumen

The predominant period and corresponding equivalent viscous damping ratio, also known in various loading codes as effective period and effective damping coefficient, are two important parameters employed in the seismic design of base-isolated and conventional building structures. Accurate determination of these two parameters can reduce the uncertainty in the computation of lateral displacement demands and interstory drifts for a given seismic design spectrum. This paper estimates these two parameters from data sets recorded from a full-scale five-story reinforced concrete building subjected to seismic base excitations of various intensities in base-isolated and fixed-base configurations on the outdoor shake table at the University of California, San Diego. The scope of this paper includes all test motions in which the yielding of the reinforcement has not occurred and the response can still be considered ‘elastic’. The data sets are used with three system identification methods to determine the predominant period of response for each of the test configurations. One of the methods also determines the equivalent viscous damping ratio corresponding to the predominant period. It was found that the predominant period of the fixed-base building lengthened from 0.52 to 1.30 s. This corresponded to a significant reduction in effective system stiffness to about 16% of the original stiffness. The paper then establishes a correlation between predominant period and peak ground velocity. Finally, the predominant periods and equivalent viscous damping ratios recommended by the ASCE 7-10 loading standard are compared with those determined from the test building
Idioma originalInglés
Páginas (desde-hasta)2459-2477
Número de páginas19
PublicaciónEarthquake Engineering and Structural Dynamics
Volumen46
N.º14
DOI
EstadoPublicada - nov 2017

Nota bibliográfica

Publisher Copyright:
Copyright © 2017 John Wiley & Sons, Ltd.

Palabras clave

  • Base isolation
  • Effective system stiffness
  • equivalent viscous damping ratio
  • Predominant period
  • Shake table testing

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