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Earthquake response spectra taking account of number of response cycles
Author(s) -
Kawashima Kazuhiko,
Aizawa Koh
Publication year - 1986
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290140203
Subject(s) - spectral line , acceleration , reduction (mathematics) , ground motion , peak ground acceleration , amplitude , base (topology) , mathematics , seismology , structural engineering , physics , geology , mathematical analysis , geometry , engineering , classical mechanics , quantum mechanics
Proposed is a new definition of earthquake response spectra, which takes account of the number of response cycles N. The N th largest amplitude of absolute acceleration response of a linear oscilator with natural period T and damping ratio h , which is subjected to ground motion at its base, is defined as S A ( T , h , N ). By defining a reduction factor η( T , h , N ) as S A ( T , h , N )/S A ( T , h , 1), characteristics of η( T , h , N ) were investigated based on 394 components of strong motion records obtained in Japan. Two practical empirical formulae to assess the reduction factor η( T , h , N ) are proposed.