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The Structural Engineer, Volume 69, Issue 1, 1991
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
The French have an elegant expression - ‘plus ca change, plus c’est la meme 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
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.