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Uniform risk vs. uniform hazard spectral acceleration for different soil types in Alborze seismic zone

Uniform risk vs. uniform hazard spectral acceleration for different soil types in Alborze seismic... Various methods have been proposed in the last decade to determine maximum credible earthquake for seismic structural design purpose. Uniform risk and uniform hazard approaches are the two ways to investigate the earthquake design spectral acceleration. The current study aims to draw a comparison between uniform risk spectra (URS) and uniform hazard spectra (UHS) at four locations with different soil types in Mazandaran (north of Iran). Since seismic hazard curves were not available for the region of interest, probabilistic seismic hazard analysis was performed at four stations by considering three attenuation relationships to account for local, regional and global effects of earthquakes. The UHS was determined at each station for the 2500-year return period. Furthermore, URS, which leads to one percent probability of collapse of a building in 50 years, was investigated by an iterative technique. It was found that a UHS leads to a greater ground shaking than URS at short periods at all soil conditions. The differences were more evident for a period range of about 0.3–0.4 s and for very strong and soft soil. To sum up, as ASCE 7–10 recommends, using uniform risk spectral acceleration is more confidential for designing short structures on all ground types. The current findings add to a growing body of literature on determination of maximum credible earthquake in seismic design of structures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Asian Journal of Civil Engineering" Springer Journals

Uniform risk vs. uniform hazard spectral acceleration for different soil types in Alborze seismic zone

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Publisher
Springer Journals
Copyright
Copyright
Subject
Engineering; Civil Engineering; Building Materials; Sustainable Architecture/Green Buildings
ISSN
1563-0854
eISSN
2522-011X
DOI
10.1007/s42107-019-00193-3
Publisher site
See Article on Publisher Site

Abstract

Various methods have been proposed in the last decade to determine maximum credible earthquake for seismic structural design purpose. Uniform risk and uniform hazard approaches are the two ways to investigate the earthquake design spectral acceleration. The current study aims to draw a comparison between uniform risk spectra (URS) and uniform hazard spectra (UHS) at four locations with different soil types in Mazandaran (north of Iran). Since seismic hazard curves were not available for the region of interest, probabilistic seismic hazard analysis was performed at four stations by considering three attenuation relationships to account for local, regional and global effects of earthquakes. The UHS was determined at each station for the 2500-year return period. Furthermore, URS, which leads to one percent probability of collapse of a building in 50 years, was investigated by an iterative technique. It was found that a UHS leads to a greater ground shaking than URS at short periods at all soil conditions. The differences were more evident for a period range of about 0.3–0.4 s and for very strong and soft soil. To sum up, as ASCE 7–10 recommends, using uniform risk spectral acceleration is more confidential for designing short structures on all ground types. The current findings add to a growing body of literature on determination of maximum credible earthquake in seismic design of structures.

Journal

"Asian Journal of Civil Engineering" – Springer Journals

Published: Sep 24, 2019

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