Stability of Cold Formed Purlins Braced by Steel Sheeting

摘要

The concept of equivalence of the behaviour of compressed lower (free) flange and a single compressed member on elastic foundation has been developed in the CTICM (France, 1979) and after later investigations and experiments, introduced in the EUROCODE 3, Part 1.3. Nevertheless, all the design cases have not yet been solved. This is, for instance, the case of the uplift load when anti-sag bars are used, for the resolution of which only a roughly approximate calculation can be used after choosing among the already existing formulae given for other similar applications. In this way, even if the first aim of the calculation, i.e. the safety, is attained, the second one, the economical aspect, is generally not achieved. The purpose of the present study is to give a generally operative approach to the solution of all the practical cases that, in addition, would correspond better with the actual structural design. The missing solutions may thus be found and the existing ones may be appreciably improved.