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Gabled rigid frames are becoming increasingly common in single-storey factory construction, but where there are two or more bays the analysis by the usual methods of structural theory presents considerable difficulties in computation. This paper presents a method, based on the general conception of moment and thrust distribution, which greatly simplifies such problems. It is particularly advantageous where the
structure consists of a large number of bays, where the roof members are in several straight portions or are curved, and where the members are of variable cross-section. It is also applicable to multi-span portal frame bridges.
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?