Impact of partially non-ergodic site-specific probabilistic seismic hazard on risk assessment of single buildings. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Kohrangi, Mohsen; Kotha, Sreeram Reddy; Bazzurro, Paolo
• Is Part Of: Earthquake spectra. Volume 37:Issue 1(2021)
• Page Start: 409
• Page End: 427
• Publication Date: 2021-02
• Subjects: Building-specific risk assessment -- non-ergodic GMPE -- site-specific PSHA -- ground-motion selection -- ergodic GMPE; Earthquake engineering -- Periodicals; Earthquake engineering; Periodicals; 624.1762
• DOI: 10.1177/8755293020938813
• Languages: English
• ISSNs: 8755-2930

Abstract

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.