The growth of global ground-motion databases has allowed generation of non-ergodic ground-motion prediction equations (GMPEs) based on specific on-site recordings. Several studies have investigated the differences between the hazard estimates from ergodic versus non-ergodic GMPEs. Here instead we focus on the impact of non-ergodic PSHA estimates on the seismic risk of nonlinear single-degree-of-freedom systems representing ductile structures and compare it with the traditional risk estimates obtained using ergodic GMPEs. The structure-and-site-specific risk estimates depend not only on the difference in the hazard estimates but also on the different hazard-consistent ground-motion record selection that informs the response calculation. The more accurate structure-and-site-specific non-ergodic risk estimates show that traditional ones may be biased in a way impossible to predict a priori. Hence, the use of the non-ergodic approach is recommended, whenever possible. However, further advancements of non-ergodic GMPEs are necessary before being routinely utilized in real-life risk assessment applications.
Impact of partially non-ergodic site-specific probabilistic seismic hazard on risk assessment of single buildings
Mohsen Kohrangi, RED – Risk Engineering + Development, Via Frank Giuseppe, 38, 27100 Pavia PV, Italy. Email: email@example.com
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Mohsen Kohrangi, Sreeram Reddy Kotha, Paolo Bazzurro; Impact of partially non-ergodic site-specific probabilistic seismic hazard on risk assessment of single buildings. Earthquake Spectra 2021;; 37 (1): 409–427. doi: https://doi.org/10.1177/8755293020938813
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