Research Article
Oct 1978
Response Spectra of Earthquake Ground Motion
Publication: Journal of the Engineering Mechanics Division
Volume 104, Issue 5
Abstract
In this paper a method is presented for direct scaling of Pseudo Relative Velocity Spectra (PSV) in terms of: (1)Earthquake magnitude M and epicentral distance R; or (2)Modified Mercalli Intensity (MMI) at a site. These models also depend directly on the geologic site conditions and are presented for horizontal and for vertical ground motions. This scaling is realized by means of coefficient functions which are determined through regression analysis of computed PSV spectra from recorded accelerograms. One of the principal advantages of the proposed method is that the ambiguities associated with the scaling of the fixed shape spectra by means of peak amplitudes of ground motion are now completely eliminated. The 91 direct regressions of horizontal and vertical spectra, at 91 periods, smoothed over all periods, lead to more complete and reliable sampling of the frequency-dependent characteristics of strong ground motion than the correlations of peak amplitudes alone.
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Published In
Journal of the Engineering Mechanics Division
Volume 104 • Issue 5 • October 1978
Pages: 1081 - 1097
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: Oct 1978
Published online: Feb 3, 2021
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Authors
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Mihailo D. Trifunac, AM.ASCE
Assoc. Prof., Dept. of Civ. Engrg., Univ. of Southern California, Los Angeles, Calif.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.