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The Structural Engineer

Quality manufactured timber I-beams (also known as ‘I-joists’) have been frequently and successfuily in use in Scandinavia and North America for more than two decades. D.B. Turnbull, M.W. Miller and C.J. Mettem

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Author – Turnbull, D B;Milner, M W;Mettem, C J

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The Structural Engineer

This paper presents an overview of work-in-progress in relation to the use of commercial adhesives to bond rods into oversized holes in order to achieve structural connections in timber and timber-based composite products. The work presented forms a 3-year European project titled ‘GIROD: Glued-In Rods For Timber [email protected], performed through collaborative activities between partners from the UK, Germany, and Sweden. The objectives, study items, and progress to date, are summarised, with particular emphasis upon issues of fatigue and design Code development. R.J. Bainbridge and C.J. Mettem

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Author – Bainbridge, R J;Mettem, C J

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The Structural Engineer

Mr C. B. Wilson (M) (Ove Arup & Partners) Having been closely involved in the development of the M-beam, I wish to explain how it incorporated incremental innovation, and, at the same time, I will clear up a misconception.

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The Structural Engineer

The ‘double entry-point’ to design caused by timber remaining ‘working stress’, whilst other materials have long been ‘limit states’, is no longer helpful to professional engineers. To overcome the problem, TRADA Technology, with funding from DETR and TRADA, is undertaking a project entitled ‘Demystifying limit states design in timber’. The project has an Advisory Group, chaired by consulting engineer Stefan Tietz, and includes other practising engineers, timber design specialists, TRADA engineering staff, and an educational representative from the University of Bath. Professionally, the project involves the Institution of Structural Engineers’ regional branches and the Professional Activities Group. The UK Glued Laminated Timber Association (GLTA) is also contributing. Christopher Mettem and Stefan Tietz

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The Structural Engineer

The West Stow Anglo-Saxon Village is a cooperation between St Edmundsbury Borough Council, the West Stow Anglo-Saxon Village Trust, and the Friends of West Stow Anglo- Saxon Settlement. The chance finding of fragments of pottery unearthed by burrowing rabbits led to the discovery of this important archaeological site. Fortunately, the area had been covered by a sand dune since the 13th century, giving archaeologists the opportunity to study a largely undisturbed Anglo-Saxon village. Most of the original timbers had decayed, but Suffcient evidence remained to plot the changes that took place between the 5th and 7th centuries and to gain a good impression of the form of the settlement. To make the discoveries accessible to the public, the village was reconstructed using tools and techniques available to the Anglo-Saxons. Fig 1 gives an indication of these reconstructions, each of which tests specific archaeological ideas. Deb Turnbull and Martin Milner

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Author – Turnbull, D B;Milner, M;Hislop, P J

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The Structural Engineer

Shear in concrete Ian Feltham writes from London, W1: Although we all prefer guidance that results in greater structural economy, Arup Research & Development is advising users of BS 8110 within OAP of two instances where the Code permits shear designs with a lower factor of safety than other Codes and where a more conservative approach should be considered.

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