The Structural Engineer > Archive > Volume 52 (1974) > Issues > Issue 7 > Discussion on Concrete Box-girder Bridges by B.I. Maisel, R.E. Rowe and R.A. Swann
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Discussion on Concrete Box-girder Bridges by B.I. Maisel, R.E. Rowe and R.A. Swann

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.