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Dr. D. Tordoff (BCSA): We are all conscious of the fact that changes are taking place in design specifications and I should like to ask Mr Needham to comment on the changing philosophy of connection design with the introduction of limit state principles. Will a different design approach be required, and is there any research needed, or being undertaken currently, for a new design approach?
Though the steel portal frame is one of the simplest structural arrangements for covering a given area, the designer probably has to satisfy at least as many different structural criteria as for more complex structures. Present-day design of portal frames is reviewed in the light of recent research studies into certain aspects of the behaviour of portal frames, particularly the problem of stability of haunched rafters. Guidance is given for checking the lateral stability of such members. L.J. Morris
Christmas test For students this is the time of year for Christmas assessments and, for qualified engineers, the time for riddles from Christmas crackers. Here is an assessment for you all! Please note the time allowed and check your answers. Verulam