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A SINGLY reinforced rectangular beam designed in accordance with the provisions of the cbde of practice for A 1:2:4 concrete with steel to B.S.S. No. 15 stressed to 20,000 lbs./in.2, has a value for Q (= MR/bd2) at working load of from 130 to 206, according to the quality of the concrete. If such a beam is tested to destruction the ultimate value of Q is unlikely to reach two and a half times the above values. R.H. Squire
Dr. R. A. Swann (Cement and Concrete Association, Research and Development Division): ‘I would like to describe briefly the two models which Mr. Lee has referred to.'
Dr. L. A. Clark has discussed (The Structural Engineer, Vol. 56A, Sept. 1978, p. 244) the complexity introduced into concrete bridge design by the temperature changes and differences specified in BS 5400: Part 2: 1978. Similar problems arise in the design of composite bridge decks. An appropriate method of analysis and several worked examples have therefore been given in a Commentary on BS 5400: Part 5: Composite bridges. R.P. Johnson