The design of a puriin system, known as Multibeam Mark 2, based on a cold-formed steel Sigma profile.
The alternative approaches to design were reviewed and a semi-empirical design procedure was described which resulted in safe but competitive load-span tables.
This paper describes the design of Multibeam Mark 3. This involves a further evolution of the cross-section together with further improvement of the design procedure.
The tendency is to continue to move away from reliance on testing and towards an approach which is much more orientated towards design by calculation, a trend which is becoming increasingly necessary in view of the proliferation of different cladding types, all offering different degrees of restraint to the purlin.
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