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The Structural Engineer

Mr. D. J. Lee (F) : The development of Fort Regent as a leisure centre is a fascinating concept from the planning and architectural point of view. That Mr. Davies possesses a deep knowledge of the fort and its history is evident from reading the first part of the paper. So attractively is the information presented that there must be many members who will be stimulated to study at greater length the historical background of the project and the development of the plan. Much more information is available in his book on Fort Regent. (See page 309).

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The Structural Engineer

The author's experience on several codes-of-practice committees has led him to the conclusion that one of the greatest fields of uncertainty lies in the specifying of effective lengths of continuous columns. This is coincidental with the difficulty of calculating elastic critical load factors and dealing with frame instability. Comprehensive design charts are given for effective lengths of columns with any local degree of end restraint, both for sway and no sway conditions. To design for the limit-state of collapse it is essential to discover new 'desk' methods of dealing with overall frame instability when effective lengths based on local restraints are not accurate enough. A new technique of 'stiffness distribution', akin to moment distribution, will be acceptable in a drawing office, both for steel and reinforced concrete frames, at the same time providing rapid estimates of the other limit-state of permissible sidesway. Important modifications for strain hardening and composite panel stiffening are included, indicating the urgent need for more full-scale tests on composite action with cladding. The emphasis throughout has been on simplicity of theory and of the many worked examples. R.H. Wood

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Author – Wood, R H

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The Structural Engineer

Fig 1. General view of the swimming pool building in the foreground with the adjacent gymnasium behind and assembly hall to the right

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The Structural Engineer

In the history of masonry bridges pride of place is usually given to the arches, with much discussion of their structural behaviour, but in fact the designers' greatest problems were always in the foundations and they also gave serious attention to the spandrels and the road. This paper is devoted to two methods of hollowing the spandrels which were introduced into British bridge building during the eighteenth century, both of which solved some problems of foundation and arch design as well as improving the spandrels. E.C. Ruddock

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Author – Ruddock, E C

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