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The Structural Engineer

This paper describes an efficient finite element technique for the elasto-plastic analysis of rectangular plates subjected to uniaxial compression. Results are presented covering aspects of plate behaviour meriting further study, which serve both to demonstrate the applicability of the method and to enhance the available information on plate behaviour. The plates analysed are supported along all four edges, and the studies presented include investigations into the effects of inplane and out-of-plane boundary conditions. The results show that the general pattern of collapse behaviour of plates is similar for all configurations of boundary conditions considered, and can be economically and accurately predicted by this method from the analysis of plates of low aspect ratio. It is shown, however, that care must be exercised in the prediction of the behaviour of plates fully constrained inplane when elastic buckling stress and yield stress are nearly equal, and of fully clamped plates of low to intermediate aspect ratio. J. ap C. Harris and G.H. Little

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Author – Harris, J ap C;Little, G H

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The Structural Engineer

Mr R. P. Dawson (H. L. Dawson & Partners) We shared the privilege of wrestling with the structure and subsoil and with the concept of Farrells on this most interesting and challenging project.

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The Structural Engineer

Raised collar roof trusses During the correspondence on this subject, introduced by Mr R. 0. C. Seaman on 18 December last, doubts have been expressed by some of our correspondents (Mr Seaman on 18 December, Owen Hope on 16 April, and Mr D. E. Clark on 18 June) on whether present practice adequately takes into account the effects of spread deflections and resisting forces introduced at the supports of trusses of this type. On 19 February Frank Hall drew attention to the guidance given by the International Truss Plate Association in restricting the recommended horizontal spread deflection of ‘raised tie trusses’ to 12mm, and to a Technical Bulletin of the Association justifying such a limiting deflection as acceptable with respect to its effect on masonry walls. Mr Clark, in his contribution, questioned the basis for this guidance. We now hear from Dr. Luke Whale, of Gang-Nail Systems Ltd. in Aldershot, in which he elaborates on the guidance quoted by Mr Hall: Having read the latest correspondence on this topic, I must confess to a feeling of great frustration over the nature of the comments made. Verulam

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