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In July 1992 a colloquium was held at Pembroke College, Cambridge, to discuss the development and performance of tensioned fabric and airsupported structures. Participants included representatives from users and fabricators, as well as engineers and other specialists. The aim of the colloquium was primarily to review the performance of these structures, to understand where the shortcomings were, and to see how the reliability could be improved. The discussion did indicate that air-supported structures could be safe and reliable, but that there were many deficiencies in design, construction, and operation, which resulted in an unacceptably large number of failures. The same did not apply to tensioned fabric structures, which have a good record of reliability. The meeting to be held at the Institution on 2 September 1993 will address these problems and review whether the situation can be improved. W.I. Liddell
An all-steel sandwich punel consists of two steel facing flat plates spot-welded onto a core of stiffeners, which may consist of zed sections, tophats, channels, or corrugated sheeting. Such panels have been studied extensively, and both numerical and analytical comparisons have been reported. This paper presents a modified thick plate approach for the analysis of snndwich panels. To better appreciate the development of the proposed method, a brief review of the previous modelling techniques - i.e. closed-form solution, grillage analogy and the conventional finite element modelling - is given. K.H. Tan, T.C. Fung and T.S. Lok
The behaviour of purlins subject to wind uplift has never addressed in British Standards or Codes of Practice but, completion of EC3, design rules are now available. This assesses the competitiveness of such methods when compared the traditional 'design by testing' approach, and illustrates this new 'state-of-the-art' design method appears to be conservative by about 30%. P. Leach and P. Robinson