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Seismic hazard disaggregation in performance‐based earthquake engineering: occurrence or exceedance?
Author(s) -
Fox Matthew J.,
Stafford Peter J.,
Sullivan Timothy J.
Publication year - 2015
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.2675
Subject(s) - seismic hazard , ground motion , context (archaeology) , incremental dynamic analysis , hazard , earthquake engineering , seismology , selection (genetic algorithm) , geology , earthquake scenario , seismic analysis , engineering , computer science , geotechnical engineering , machine learning , paleontology , chemistry , organic chemistry
Summary Seismic hazard disaggregation is commonly used as an aid in ground‐motion selection for the seismic response analysis of structures. This short communication investigates two different approaches to disaggregation related to the exceedance and occurrence of a particular intensity. The impact the different approaches might have on a subsequent structural analysis at a given intensity is explored through the calculation of conditional spectra. It is found that the exceedance approach results in conditional spectra that will be conservative when used as targets for ground‐motion selection. It is however argued that the use of the occurrence disaggregation is more consistent with the objectives of seismic response analyses in the context of performance‐based earthquake engineering. Copyright © 2015 John Wiley & Sons, Ltd.