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At the beginning of this century an aeronaut was one who 'sailed' in a balloon, and apart from the technique of making the necessary fabric gas container there was little of engineering construction about his activities. Since then has come the whole history of airships and the rapid development of aeroplanes, and in both of these aircraft structural engineering has played a large part. These developments were greatly extended and accelerated by the two world wars of this century, which brought about many contacts between engineers normally working in quite different and usually separate fields. As a result there has been much greater 'give and take' between the rather closed world of aeronautics and the general world of engineering structures than would otherwise have occurred, leading to much interaction and mutual interest between the two parties. It is with the outcome of this that this paper is specially concerned.
Sir Alfred Pugsley
In the design of open-web trusses the axial stresses are usually calculated on the following assumptions:
(1) all members are straight and free to rotate at the joints, which are assumed to act as smooth hinges;
(2) all joints lie at the intersection of the centroidal axis of the members; and
(3) all loads, including the weight of the member, are applied at the joints.
Mr. F. T. Middleton (Member) asked what, in United States practice and taking 30 storeys as a maximum, was approximately in the author's estimation and experience the weight, cost and erection speed differential between a high strength bolted structure and a comparable site-welded partially bolted structure?