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Professor S. R. Sparkes (Member) referred to the stress concentration factor of 17 which had been recorded at sea and to Dr. Chapman’s statement that it was possible, by introducing a suitably shaped cut, to reduce this figure very greatly. Could Dr. Chapman give a little more detail of what a suitably shaped cut would be, and what he meant by very greatly reducing the stress concentration?
The background development and advantages of this form of construction are described and the range of bridge types and span dimensions currently used in North America and elsewhere are given. Materials used for glue lamination are discussed with respect to timber species and grades, timber preservatives and adhesive types, in terms of North American and British specifications. The manufacturing process is described, as are the quality control procedures necessary to achieve a high standard of lamination. T.M. Wardle
The most recent extension to the Engineering laboratories at Cambridge University has been designed with a fully rigid site-welded steel frame. The method proposed by the Joint Committee was used as far as possible but certain departures were made, mainly due to the use of high yield steel. The method involves (a) the plastic dcsign of the beams and (b) the use of limited substitute frames to determine bending momcnts in the columns, and both these features are present in the design. The stability of the columns was checked by the BCSA charts rather than by the tables given by the Joint Committee. Sample calculations are given to illustrate the working of the method and comparison is made with a sketch plastic composite design. J. Heyman, J.C.H. Finlinson and R.P. Johnson