Performance based seismic design of an offshore platform in the Caspian Sea

Author: Rupert Gibson BEng, MSc, CEng, MIMechE Tom R Wilcock MEng, CEng, MICE Damian N Grant PhD, PE David A Gration BEng, CEng, MIMechE (All authors are with Arup, London)

Date published

26 October 2012

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Performance based seismic design of an offshore platform in the Caspian Sea

The Structural Engineer
Performance based seismic design of an offshore platform in the Caspian Sea
Date published

26 October 2012

Author

Rupert Gibson BEng, MSc, CEng, MIMechE Tom R Wilcock MEng, CEng, MICE Damian N Grant PhD, PE David A Gration BEng, CEng, MIMechE (All authors are with Arup, London)

Price

Standard: £9 + VAT
Members/Subscribers: Free

Buy Now
Author

Rupert Gibson BEng, MSc, CEng, MIMechE Tom R Wilcock MEng, CEng, MICE Damian N Grant PhD, PE David A Gration BEng, CEng, MIMechE (All authors are with Arup, London)

The development of gas fields in a highly seismic zone in the Caspian Sea required an innovative offshore platform. Arup were the detailed designers of a self-installing gravity based structure (GBS) to meet this demand – the first such platform to be commissioned in the region. Arup became involved after an elastic analysis based prescriptive design approach predicted the platform to have inadequate capacity to withstand signifiant seismic events. The Arup team adopted a performance based approach, in combination with advanced non-linear analyses, to demonstrate the suitability of the design for use in this location. Non-linear time history soil-structure interaction finie element analyses were used to demonstrate that the GBS platform satisfied the peformance requirements of ISO 19901-21. In addition, the performance based approach provided the client with an improved understanding of the likely response of the structure to a real earthquake and a greater ability to manage the risks associated with the facility.

Additional information

Format:
PDF
Pages:
9
Publisher:
The Institution of Structural Engineers

Tags

Project Focus Issue 11

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