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Mr M. James (Health & Safety Executive): In his paper Dr. Dickie likened the structure of demountable grandstands to that of both space frames and storage racking. In fact this is not so, as these structures tend to have a form of plan bracing at various levels, while in most grandstands the only plan bracing available is at seating level. This means that, unless the stands are quite small, the taller rear frames will receive no support from adjacent ones for a large proportion of their height. Wear or poorly-designed seat fixings would make this problem even more acute.
The paper describes the development and design of the steel rising sector gates of the Thames Barrier. Particular attention is also paid to the structural model testing programme which was undertaken as part of the design process. R.G.R. Tappin, Professor P.J. Dowling and P.J. Clark
This paper describes the reconstruction of a stone tower in the medieval walled defences around the old City of York. The towers and walls making up the defences are a scheduled ancient monument. Any reconstruction or restoration work to them consequently requires very specialised engineering techniques that will not only satisfy the structural needs of the monument but will leave it in an authentic and original form. J.R. Nursey and R.W.A. Dallas