Product catalogue
Opportunities to enhance seismic demand parameters for future editions of the AS1170.4
<p>Geoscience Australia has recently released its 2018 National Seismic Hazard Assessment (NSHA18). Results from the NSHA18 indicate significantly lower seismic hazard across almost all Australian localities at the 1/500 annual exceedance probability level relative to the factors adopted for the current Australian Standard AS1170.4–2007 (R2018). These new hazard estimates, coupled with larger kp factors, have challenged notions of seismic hazard in Australia in terms of the recurrence of damaging ground motions. As a consequence, the new hazard estimates have raised questions over the appropriateness of the prescribed probability level used in the AS1170.4 to determine appropriate seismic demands for the design of ordinary-use structures. Therefore, it is suggested that the ground-motion exceedance probability used in the current AS1170.4 be reviewed in light of the recent hazard assessment and the expected performance of modern buildings for rarer ground motions.
<p>Whilst adjusting the AS1170.4 exceedance probability level would be a major departure from previous earthquake loading standards, it would bring it into line with other international building codes in similar tectonic environments. Additionally, it would offer opportunities to further modernise how seismic demands are considered in Australian building design. In particular, the authors highlight the following additional opportunities: 1) the use of uniform hazard spectra to replace and simplify the spectral shape factors, which do not deliver uniform hazard across all natural periods; 2) updated site amplification factors to ensure continuity with modern ground-motion models, and; 3) the potential to define design ground motions in terms of uniform collapse risk rather than uniform hazard.
Estimation of seismic hazard at any location is an uncertain science. However, as our knowledge improves, our estimates of the hazard will converge on the actual – but unknowable – (time independent) hazard. It is therefore prudent to regularly update the estimates of the seismic demands in our building codes using the best available evidence-based methods and models.
Simple
Identification info
- Date (Publication)
- 2018-11-15T00:00:00
- Date (Revision)
- 2020-05-12T00:59:37
- Citation identifier
- ga-dataSetURI/https://pid.geoscience.gov.au/dataset/ga/123356
- Cited responsible party
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Role Organisation / Individual Name Details Author Allen, T.
Author Luco, N.
- Name
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Australian Earthquake Engineering Society 2018 Conference
- Purpose
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Conference Paper
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Allen, T.I.
Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
- Spatial representation type
- Topic category
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- Disaster
Extent
Extent
))
- Maintenance and update frequency
- Not planned
Resource format
- Title
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Administration to complete
- Date
- 2020-05-12
- Edition
-
Administration to complete
- Distributor contact
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Role Organisation / Individual Name Details Distributor Geoscience Australia
Voice
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Product
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2018 National Seismic Hazard Assessment
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- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Keywords
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hazards
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- Keywords
-
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
-
4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
-
Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
-
Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
-
Download the document (pdf) [1.9 MB]
Download the document (pdf) [1.9 MB]
- Distribution format
-
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pdf
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Resource lineage
- Statement
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Not supplied
- Hierarchy level
- Product
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/6f3e2112-2014-4e14-9c7d-2b4a4c866a82
- Title
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GeoNetwork UUID
Type of resource
- Resource scope
- Document
- Name
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GA Publication: External Publication
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/123356
- Metadata linkage
-
https://ecat.ga.gov.au/geonetwork/srv/eng//metadata/6f3e2112-2014-4e14-9c7d-2b4a4c866a82
- Date info (Creation)
- 2018-10-04T05:16:11
- Date info (Revision)
- 2018-10-04T05:16:11
Metadata standard
- Title
-
AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3 (Draft Schemas 2015)
- Edition date
- 2015-07-01T00:00:00
- Title
-
Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, April 2015