Author: Scott, R H
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Scott, R H
The Structural Engineer, Volume 70, Issue 18, 1992
Preservation of structural timbers On 19 May, we summarised the background to the correspondence that has appeared in Verulam on this topic. Dr A. F. Bravery, who is Head of Timber Division at BRE, enlarges on the numerous factors affecting the issues covered by our correspondents: In focusing on the specific issue of achieving adequate penetration of liquid wood preservatives into the heartwood of timber species that are inherently variable or inconsistent in their resistance to fluid penetration, and on whether specification and monitoring should be on a results or process basis, your correspondents appear to cast doubts on the confidence in timber in general and preservative-treated timber in particular for structural purposes. This is particularly regrettable at a time when the supreme environmental advantages of wood as a natural, renewable material, which absorbs carbon dioxide from the atmosphere, have never been more important. Verulam
Jack Waller will succeed Tony Cusens as President of the Institution 1992-93 at an Ordinary Meeting at Institution headquarters on 1 October 1992. The handover will be at 6 pm when the new President will give his Presidential Address ‘An agenda for a New Age’, the full text of which will be published in The Structural Engineer in November.
Century Tower is a twin-tower 100m-tall office building in central Tokyo completed in early 1991. Lateral resistance is provided in one direction by rigid frames and, in the other, by eccentrically braced frames of unusual geometry. Being taller than 6Om, the structure had to pass the special approval procedures of the Japanese Ministry of Construction. These procedures involved the explicit non-linear analysis of the structure for moderate and extreme earthquakes. The paper describes the basis of the design and the analyses carried out. A.J. Fitzpatrick