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S. B. Desai (M): It can be observed from the formulae given in the paper (as well as clause A.3.2 of CP 110) that the calculated crack widths in RC members are proportional to the covers provided to the reinforcing bars. Because of this, the design of structures exposed to severe conditions (e.g. a marine environment) seems to have to satisfy somewhat over-stringent criteria.
Professor B. P. Hughes (F) (University of Birmingham): I should like to congratulate the author on a most interesting and useful paper, and for his presentation of the theoretical background to the crack width predictions given in the current British Codes of Practice. Dr. Beeby has asked, ‘Is the picture reasonable and right, and what limitations has it?’
The optimum design of a range of steel roof structures is established using a combination of non-linear programming methods. The objective function is cost orientated and a suitable cost model is described. The relative costs of seven types of roof structure are compared and conclusions drawn as to cost effectiveness.
A.B. Crawford and W. M. Jenkins