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The Structural Engineer

THE recently constructed tissue mill at Northfleet for the Bowater-Scott Corporation is an interesting example in the use of a combination of precast and prestressed construction which embodies certain new techniques. For this reason it is felt that an extension of the methods used may well be applied to particular projects in the future where rapid erection and the employment of a minimum skilled labour force are envisaged. A.E. Beer and L. A. Macer

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The Structural Engineer

Mr. G. SVED: I should like to congratulate Dr. Bray on his clear and comprehensive paper on the application of "An Electrical Analyser for Rigid Frameworks."

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The Structural Engineer

IN a paper describing a series of full scale loading tests on a reinforced concrete uilding1 which was presented to the Institution some time ago an account was given of tests to failure which were made on reinforced concrete slabs spanning in two directions. The slabs were very lightly reinforced, but the ultimate loads found in the tests were much greater than had been anticipated, and exceeded the collapse loads calculated on the basis of plastic behaviour by a considerable margin. At the time it was not possible to account satisfactorily for the unexpected strength exhibited by the slabs. The results of the tests, however, have recently been re-examined and certain experimental investigations have been made. As a result a rational explanation of the behaviour of the two-way slabs at failure can now be put forward. A.J. Ockleston

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Author – Ockleston, A J

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The Structural Engineer

A PREVIOUS paper, "The Failure Load of Rigid A Jointed Frameworks as Influenced by Stability," published in this Journal in July 1954 introduced the idea that elastic critical loads are one of the important parameters governing the behaviour of frameworks. As one side of a research project on the combined effects of plasticity and stability on frameworks, attention was therefore directed to the problem of calculating critical loads. This paper concludes a series of papers on the critical loads of Tall Building Frames. R. E. Bowles and W. Merchant

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Author – Bowles, R E;Merchant, W

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The Structural Engineer

Mr. J. J. LEEMING (Member): Dr. Lightfoot’s paper deals with structures of constant section, and is to that extent misleading, because it is therefore one of those methods which tend to lead designers to fit their structures to their method of design.

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