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The Structural Engineer

Dr. L. A. Clark (M) (University of Birmingham): This paper is most welcome since, in the past, equations for predicting strains and crack widths in reinforced concrete members have been applied to composite members-sometimes with misleading results. The present paper shows how strains in composite members can be predicted accurately, and the writer looks forward to seeing the publication of the authors’ reference 10, which will be concerned with crack width prediction in composite members.

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The Structural Engineer

This paper describes the development of post-tensioned brickwork beams and their behaviour up to failure under short-term loading. The brickwork section was specially designed for ease of construction and grouting of the tendons. The test results of 15 post-tensioned beams, with spans ranging from 2 m to 6 m, are given. The ultimate moments obtained from the tests are compared with the theoretical moments derived from a simplified cubic parabolic stresdstrain relationship of the brickwork, and it is shown that the ultimate moment of post-tensioned brickwork can be closely predicted by this method. R. F. Pedreschi and B. P. Sinha

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The Structural Engineer

80 pin-ended and 12 simply supported beams were tested by dropping a nominally rigid striker onto the beam at midspan. For each test the impact force history and the beam displacements (maximum and residual) were measured. G. Hughes and A.W. Beeby

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The Structural Engineer

An experimental study of the lateral stability of castellated steel beams is described. Although an extensive survey of the literature on castellated beams showed that this subject had not been investigated experimentally before, some useful information was obtained from tests conducted to investigate in-plane response. This showed that the lateral-torsional buckling failure of castellated beams was similar to that of equivalent plain-webbed beams. Two series of tests were conducted: a preliminary series on specially manufactured small-scale specimens designed to provide qualitative data and a second series of eight full-scale tests using commercially produced beams. The results of the preliminary series, subsequently confirmed by the main series of tests, suggested that the presence of the castellations had negligible effect on lateral buckling behaviour. Comparisons between the experimentally obtained maximum loads for the main series and the strengths predicted by the proposed draft Code for structural steelwork B/20 proved generally satisfactory, provided cross-sectional properties at a castellation were used in the calculations. Similar results were obtained for the two-stage procedure of BS 449, whereas the use of Table 3 in that document was shown to lead to rather low load factors. D.A. Nethercot and D. Kerdal

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