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This colloquium is intended to be an enjoyable experience, with a serious objective. Professor Sir Alan Harris, Mr J. Bobrowski, Professor E. Happold, Professor R. G. Taylor, and Mr C. Hobbs will present the short papers that follow, to initiate a stimulating and provocative informal discussion.
A prewar aeroplane hangar structure is described, the roof of which consists of a series of hyperboloids of revolution supported on bowstring girders of 70 m clear span. The thickness of the membrane was 1.4 mm. The authors of the structure had intended that the membrane should be stabilised by tensioning it in a spanwise direction, thereby inducing tension on the membrane in a transverse direction as well. In fact, no advantage was taken of the membrane effect, since the hyperboloids were
stiffened by light open-web beams spanning between the bowstring girders.
Professor Sir Alan Harris
We have received a letter signed jointly by Dr. D. D. Matthews, Chairman CSB/39 (concrete Code), and Mr B. A. Haseltine, Chairman CSB/33 (masonry Code): The January, February, May, June, and September 1980 issues of The Structural Engineer contained a running debate on the subject of the restraint of loadbearing masonry walls by precast concrete floors and the implications for the robustness of hybrid structures. We realise, from the correspondence to Verulam and from questions raised at other meetings, that this is a subject that is bothering many members of our profession. We thought, therefore, that it would be helpful if we gave our joint views on the subject.
R. M. Weed (Department of Transportation, State of New Jersey, USA): I am completely in agreement with the author’s efforts to point out that many of the acceptance criteria in existing specifications leave a lot to be desired.