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The Structural Engineer, Volume 75, Issue 3, 1997
This note provides guidance on the design of braced steel frames for buildings, utilising the significant moment resistance of unstiffened connections such as those shown in Fig 1. They do not provide full continuity but both BS 5950 and Eurocode 32 permit a ‘semi-continuous’ approach to design. These connections require only moderate fabrication effort and hence are relatively cheap. Semi-continuous framing is therefore becoming recognised as providing a more cost-effective approach than either simple or fully-continuous design. So far though, its application has been hindered by uncertainty over the extent of the benefits, by the failure of design Codes to provide methods to predict connection properties, and by lack of guidance on how to approach design of the frame as a whole. Guidance can now be provided on each of these aspects. Professor D. Anderson and A.F. Hughes
This paper discusses the philosophy of the conservation of the built environment as seen by English Heritage and other conservation bodies. It examines the role of the structural engineer in building conservation and considers whether the education of engineers allocates sufficient time to the study of existing structures. I.J. Hume
Mr E. H. F. Taylor (F) (Ove Arup & Partners) How times change! This paper takes me back some 35 years to Trafford Park in Manchester and part of the structural steelwork industry. The most basic chore in that office was the scheduling of bolts for a job. We used to arm ourselves with full-sized sections of rolled steel joints and rolled steel channels showing the exact dimensions of bolts through the flanges, and then we would proceed: 3/4in diameter generally, 5/8in diameter for 4in flanges, 1/2in diameter for 3 1/2in flanges. It was, of course, sacrosanct that no part of the threaded portions occurred in the shear planes. Our economical length was 1/4in. On occasions we would end up by specifying a bolt, say, connecting a channel to a joist with perhaps up to two flat washers, an 8° washer, a 5°washer, and a description showing the drawing, the stanchion number, the details of the connection, and so on.