Imperial College London
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ProfessorPeterStafford

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Engineering Seismology
 
 
 
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Contact

 

+44 (0)20 7594 7916p.stafford

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

321Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Stafford:2017:10.1785/0120170081,
author = {Stafford, PJ},
doi = {10.1785/0120170081},
journal = {Bulletin of the Seismological Society of America},
pages = {2774--2791},
title = {Interfrequency correlations among Fourier spectral ordinates and implications for stochastic groundmotion simulation},
url = {http://dx.doi.org/10.1785/0120170081},
volume = {107},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Models for the interfrequency correlations among Fourier spectral ordinates and variances of these ordinates are presented. These covariances among Fourier spectral ordinates can be used to generate accelerograms within a stochastic simulation framework that offer improvements over traditional approaches that make use of deterministic Fourier amplitude spectra combined with a random phase spectrum. The article demonstrates that the accelerograms generated in this new way result in response spectral ordinates that have variances that are very consistent with those predicted by empirical groundmotion models. In addition, the interperiod correlations among response spectral ordinates obtained from the simulated motions are also consistent with empirically derived response spectral correlations. The study partitions the variance among Fourier spectral ordinates into betweenevent, betweensite and withinevent components, and interfrequency correlation models, and variance models are derived for each component. The betweenevent correlations are found to exhibit a mild degree of magnitude dependence. An important feature of the new correlation and variance models is that they can be used to generate accelerograms that are broadly consistent with conditional response spectra. This new approach has significant implications for responsehistory analyses within earthquake engineering that make use of conditional spectra as a target.
AU  - Stafford,PJ
DO  - 10.1785/0120170081
EP  - 2791
PY  - 2017///
SN  - 0037-1106
SP  - 2774
TI  - Interfrequency correlations among Fourier spectral ordinates and implications for stochastic groundmotion simulation
T2  - Bulletin of the Seismological Society of America
UR  - http://dx.doi.org/10.1785/0120170081
UR  - http://hdl.handle.net/10044/1/50105
VL  - 107
ER  -
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