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Mr. K. Kretsis (F) : I would like to ask a question with regard to tube combination by internal sub-division. The horizontal beam members of the external tube sides have a considerable stiffness, how is a comparable stiffness achieved in the horizontal beam members of the internal sub-divisions of the tubes so that they may have a substantial effect on the shear lag within the external cross-planes of the tubes?
An experimental investigation on reinforced concrete beams undertaken to determine the influence of fluctuation of loading on deflexions is described. The beams were subjected to a range of loading regimes usually with a fluctuating component. A linear logarithmic relationship was found between the increase in maximum deflexion and the number of fluctuations or the length of time under load. Increases in deflexion of beams under fluctuating loads were about the same as for beams subjected to sustained load equal in magnitude to the maximum of the fluctuation. The results are related to present design criteria and methods of analysis for deflexions of reinforced concrete structures and the implications for design are discussed. P.R. Sparks and J.B. Menzies
The history of the Fort Regent from its origins to the present day are first described followed by the requirements of the States of Jersey and the evolution of the design now under construction. The engineering problems encountered and the derivation of design loadings together with the solutions to these problems and the design logic employed are discussed. The various structural elements that form the complete roof structure, such as the curved roof beams, fascia girders, portal frames, and the north and south ends and the dome, are fully described together with the design procedure for the structural elements and the methods of shop and site fabrication. W.H. davies, B.A. Gray and F.E.S. West