Regional Group Profile (South Eastern Counties)

Author: Various

Date published

2 May 2012

First published: 2 May 2012

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Regional Group Profile (South Eastern Counties)

The Structural Engineer
Regional Group Profile (South Eastern Counties)
Date published

2 May 2012

First published

2 May 2012

Author

Various

Price

Standard: £9 + VAT
Members/Subscribers: Free

Buy Now

One of the Institution's largest Regional Groups places strong emphasis on CPD...

Additional information

Format:
PDF
Pages:
4
Publisher:
The Institution of Structural Engineers

Tags

Opinion Issue 5

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The United States Air Force Memorial – Use of impact dampers to control wind induced vibrations

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The United States Air Force Memorial (USAFM), overlooking the Pentagon in Washington DC, comprises three stainless steel spires which evoke an image of aircraft in a ‘bomb-burst’ manoeuvre. The elegance and simplicity of their architectural form belies the complexity of their engineering design. Structurally they consist of a stiffened stainless steel shell with the lower two thirds of each filled with concrete. A second component, essential to the integrity of the structure, is also hidden by the steel skin; a series of large, steel-coated spheres, free to roll in oversized padded boxes, are located inside each spire. The purpose of these ‘impact dampers’ is to stabilise the motions of the spires in high winds. This article provides an overview of the spire structures and focuses on the challenges encountered during the design, development and test of the damping devices.

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Complete issue (May 2012)

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All articles published in the May 2012 issue.

(NB Technical Guidance Note Level 1, No. 8 contained within this issue was updated in October 2016. For the updated article, see the individual article entry for this issue.)

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