Guidelines for Design of Dams and Appurtenant Structures for Earthquake (May 2019)

ANCOLD published its first Guidelines for Design of Dams for Earthquake in 1998. The Guidelines were prepared to bring together knowledge about earthquakes in Australia following the devastating
Newcastle (1989 magnitude Mw 5.4) and the Tennant Creek (1988 magnitude Mw 6.6) earthquakes, and improved analytical methods to predict the behaviour of dams subject to earthquake.

When the 1998 Guidelines were issued, it was recognised that over time there would be improved data and tools to help the designer. This has indeed been the case and ANCOLD decided that it would be timely to update its Guidelines to incorporate the significant advances made in the understanding of earthquakes, seismic hazard assessments, analysis and design.

The Working Group convened to produce these updated Guidelines, replacing the 1998 Guidelines, was composed of representatives from dam owners, State dam safety regulatory agencies and private consulting practices. The draft Guidelines were made available for comment by ANCOLD members and international review of the Guidelines was undertaken by eminent practitioners in the subject matter from the United States, New Zealand and Switzerland.

Because of the seismic hazard uncertainty and the associated structural response, these Guidelines
encourage the use of risk-based methods for assessing existing dams and for the design of new dams. However, the deterministic approach is also covered for those owners who prefer to use it.

This guideline is the culmination of a great deal of voluntary work by convenor, Mr Steve O’Brien and his working group. It is a significant development for dam engineering in Australia and will be a valuable resource.

As with all ANCOLD Guidelines, this guideline is not a design code or standard and has been produced for the guidance of experienced practitioners who are required to apply their own professional skill and judgement in its application. Users must keep abreast of developments in the design of dams and appurtenant structures for earthquake and take those developments into account when using these Guidelines.

The Guidelines will again be reviewed when knowledge and practice have developed to a point when an update is required. Accordingly, ANCOLD welcomes comments from users and other interested parties.

Shane McGrath
Chairman of ANCOLD Inc.

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