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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?’
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.
The subject of this paper is the field erection of the off gas stack at Chin Shan nuclear power station, Taiwan. This is a braced frame structure composed of tubular members. The leg splices were site welded and all other connections bolted. A.P. Mann