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Mr M. D. Japes (Director of Engineering, British Waterways Board): Bearing in mind that the design and construction techniques were so innovative, if it was required to repeat the construction, are there any aspects that Mr Simpson would now change, either in the design or in the construction techniques?
Timber floor design The design of timber construction is a subject that attracts a regular, but fairly infrequent, correspondence to this column. This month ’S contribution is from Mr W. Price of Cardiff who has some questions on the intentions of the new BS Code for timber design and their interpretation by local authorities. He writes: I have recently had a timber floor design queried by Building Control with reference to the new timber Code BS5268: Part 2.
Recent repairs to 18th century buildings have brought to light trussed girders, large timber beams with internal trusses, which were used extensively during the 18th and 19th centuries. The paper examines their origins, their rise in popularity, and their eventual demise. It goes on to review the opinions of contemporary authors, showing the wide disparity of knowledge regarding the behaviour of such structural members. Finally, it reports on a series of tests that provide information about the actual behaviour of the girders, the reasons for their use, and suggestions as to why they eventually fell from favour. M.H. Dawes and D.T. Yeomans