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The Structural Engineer

Dr. M. J. Blackler (Mott MacDonald)/Mr R. J. Bridle (Consultant) The authors have presented in their paper on the behaviour of masonry arch bridges a three-hinged method of analysis which is extended to allow failures by local crushing of the masonry to be simulated. In response to this paper, we would like to draw attention to the fact that failure calculations based on local crushing of the masonry can be very sensitive to the chosen value of allowable compressive strength.

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The Structural Engineer

The French have an elegant expression - ‘plus ça change, plus c’est la même chose’; loosely translated, it means there is nothing new in the world. Some engineers may have noticed a recent trend (or should one say ‘fad’) for clients to contract on a ‘design and build’ basis, where the contractor assumes responsibility for designing as well as constructing a building. There had been a similar fad in the early 1970s (again, during a construction boom), only then such contracts were called ‘package deals’. J.J. Ward

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The Structural Engineer

The Maitland Lecture is properly given in honour of a man who, as Secretary, served the Institution of Structural Engineers for over 30 years. The secretaryship of any institution is generally a burdensome and thankless task but, in this case, brings biennially recognition to one who deserves well of those who uphold his memory. I therefore applaud this action on the part of the Institution, but, although conscious of the honour afforded me, take issue on the choice of lecturer in 1990. However, the choice having been made, it is rarely sensible if not actually dangerous for the lecturer to read what his predecessors have said, particularly when the subject of the speaker’s own choice is one in which he has an interest and even knowledge. Unfortunately, I had recourse to the preceding lectures on engineers and engineering and their impact on our society now and as it might be. What I had to say I found had already been more than hinted at, if not said. Those of you in the audience who have read the previous Maitland Lectures on engineers and engineering (or, having been here before, feel you will be experiencing deja vu), please leave quietly. Sir Monty Finniston

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The Structural Engineer

The elastic buckling of simply supported beams subject to various patterns of distributed loading is considered. The buckling analysis is based on a numerical technique which is an adaptation of that proposed by Newmark for the buckling of columns. The results are presented in the form of design charts which may be used to determine the critical intensity of the load at which buckling will be initiated. Consideration is also given to the variation in the buckled shapes of beams subject to reverse distributed loading, which can vary between the extremes of symmetry and skew-symmetry. Professor B.K. Dougherty

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