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The Chairman remarked that the paper had referred to a 2-ton crane, the existing 2-ton cranes in the low-level hangar having been taken down, reconditioned and re-erected one bay further out on the cantilever roof. But Fig 6 showed a 5-ton crane on the outer part of the cantilever roof. Was that the crane referred to, or was there another 2-ton crane somewhere? If it was a 5-ton crane that had been moved out, had it been necessary to strengthen the roof structure?
The development of a general computer programme for economical solution of large space frameworks by the stiffness method is described. The programme includes routine for equation solution by direct methods; the latter take advantage of the symmetry, bending and sparseness of the stiffness matrix.
D.F. Brooks and D.M. Brotton
The author considers the requirements for workmanship in the construction of structural concrete. The concrete mix, batching and placing, the design, construction and striking of formwork are all covered, together with the requirements of curing and
cold-weather concreting. The author proposes a svstem of tolerances for construction and gives special consideration to surface finishes for architectural effects.