Author: Turnbull, D B;Milner, M;Hislop, P J
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Turnbull, D B;Milner, M;Hislop, P J
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.
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
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.