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THE Institution's Shear Study Group, which began its meetings in March 1965, was given the following terms of reference: 'To consider the available information on shear in
concrete in various scientific papers and foreign Codes, to decide what further tests are required, and to put forward suggestions for a research programme which will eventually enable a relationship to be established between design formulae and the various modes of failure that can occur.'
Professor A.L.L. Baker, C.W. Yu and P.E. Regan
Dr. E. C. Harnbly (M): I suggested that the Institution should hold this colloquium because it seemed to me that we are becoming increasingly preoccupied with regulations and Codes relating to what has happened in the past and need to speculate about which way we are going, even if we feel that we are making very little headway at the time.
Dr. E. C. Hambly (M) : I wish to challenge the authors' statement that grillage analysis is inappropriate for decks with less than four cells. I will substantiate this challenge by demonstrating that the shear-flexible grillage can be used to reproduce the structural behaviour of a box-girder deck with the accuracy of a more sophisticated technique. I advocate grillage analysis of cellular decks because-it is an automatic method which does not require a high level of concentration in the design office over a long period, it is relatively inexpensive for analysis of multiple load cases, it can accommodate variations of geometry in plan and section, and it can be used with accuracy. There are shortcomings but they are no worse than those associated with grillage analysis of beam and slab decks. I should add that my enthusiasm for grillage analysis has developed considerably since I changed to the C&CA program which has very simple and clear data praparation and output.