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In May, 1950, the Ministry of Civil Aviation invited tenders for the design and construction of a three-bay hangar at London Airport. With a view to reducing maintenance costs to a minimum, the roof structure was to be fabricated in aluminium alloy but the stanchions, at the discretion of the tenderer, could be either steel or aluminium. This paper will demonstrate that aluminium is a material to be seriously considered for work of this nature.
In presenting a previous paper', the author demonstrated the solution of a five-bay gabled frame of which each bay was unsymmetrical in geometry and loading. The solution was not then published, and in the present paper the calculation is set out in a form which can be applied to gabled frameworks with any inclination of the two rafters and With any loading. If the loading and the bays are symmetrical there is a considerable simplification of the general case.
Mr I.P. Gillson (M) (Central Electricity Generating Board): I draw the attention of specifying engineers to the need to
-study carefully the September 1983 draft ‘Guidance notes’ when dealing with particularly vulnerable structures
-consider the relevance of tests on mortar prisms and cubes to the risk of ASR damage
-consider the scale effects of concrete samples on the risk of ASR damage
-examine evidence from concrete that has been damaged by ASR